bq2060
SBS v1.1-Compliant Gas Gauge IC
Features
General Description
>
The bq2060 SBS-Compliant Gas
Gauge IC for battery pack or
in-system installation maintains an
accurate record of available charge in
rechargeable batteries. The bq2060
monitors capacity and other critical
battery parameters for NiCd, NiMH,
Li-Ion, and lead-acid chemistries.
The bq2060 uses a V-to-F converter
with automatic offset error correction
for charge and discharge counting.
For voltage, temperature, and current
reporting, the bq2060 uses an A-to-D
converter. The onboard ADC also
monitors individual cell voltages in a
Li-Ion battery pack and allows the
bq2060 to generate control signals
that may be used in conjunction with
a pack supervisor to enhance pack
safety.
Provides accurate measurement
of available charge in NiCd,
NiMH, Li-Ion, and lead-acid
batteries
>
Supports SBS Smart Battery
Data Specification v1.1
>
Supports the 2-wire SMBus v1.1
interface with PEC or 1-wire
HDQ16
>
>
Reports individual cell voltages
>
Provides 15-bit resolution for
voltage, temperature, and current measurements
>
Measures charge flow using a
V-to-F converter with offset of
less than 16µV after calibration
Monitors and provides control to
charge and discharge FETs in
Li-Ion protection circuit
>
Consumes less than 0.5mW operating
>
Drives a 4- or 5-segment LED
display for remaining capacity indication
>
28-pin 150-mil SSOP
Pin Connections
HDQ16
ESCL
ESDA
RBI
REG
VOUT
VCC
VSS
DISP
LED1
LED2
LED3
LED4
LED5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
The bq2060 supports the smart battery data (SBData) commands and
charge-control functions. It communicates data using the system management bus (SMBus) 2-wire protocol or
the Benchmarq 1-wire HDQ16 protocol. The data available include the
battery’s remaining capacity, temperature, voltage, current, and remaining run-time predictions. The bq2060
provides LED drivers and a
push-button input to depict remaining
battery capacity from full to empty in
20% or 25% increments with a 4 or
5-segment display.
The bq2060 works with an external
EEPROM. The EEPROM stores the
configuration information for the
bq2060, such as the battery’s chemistry, self-discharge rate, rate compensation factors, measurement calibration, and design voltage and capacity.
The bq2060 uses the programmable
self-discharge rate and other compensation factors stored in the EEPROM
to accurately adjust remaining capacity for use and standby conditions
based on time, rate, and temperature.
The bq2060 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from near full to near empty levels.
The REG output regulates the operating voltage for the bq2060 from the
battery cell stack using an external
JFET.
Pin Names
SMBC
SMBD
VCELL4
VCELL3
VCELL2
VCELL1
SR1
SR2
SRC
TS
THON
CVON
CFC
DFC
28-Pin 150-mil SSOP
28PN2060.eps
HDQ16
Serial communication
input/output
ESCL
Serial memory clock
ESDA
Serial memory data and
address
RBI
Register backup input
REG
Regulator output
VOUT
EEPROM supply output
VCC
Supply voltage
VSS
Ground
DISP
Display control input
LED1–
LED5
LED display segment outputs
SLUS035D–SEPTEMBER 2001
1
DFC
Discharge FET control
CFC
Charge FET control
VON
trol
Cell voltage divider con-
THON
Thermistor bias control
TS
Thermistor voltage input
SRC
Current sense input
SR1–
SR2
Charge-flow sense resistor
inputs
VCELL1– Single-cell voltage inputs
VCELL4
SMBD
SMBus data
SMBC
SMBus clock
bq2060
DFC
Pin Descriptions
HDQ16
Output to control the discharge FET in the
Li-Ion pack protection circuitry
Serial communication input/output
CFC
Open-drain bidirectional communications
port
ESCL
CVON
Serial memory data and address
THON
Thermistor bias control output
Output control for external FETs to connect
the thermistor bias resistor during a temperature measurement
Register backup input
TS
Input that provides backup potential to the
bq2060 registers during periods of low operating voltage. RBI accepts a storage capacitor or a battery input.
Thermistor voltage input
Input connection for a thermistor to monitor
temperature
SRC
REG
Cell voltage divider control output
Output control for external FETs to connect
the cells to the external voltage dividers
during cell voltage measurements
Bidirectional pin used to transfer address
and data to and from the bq2060 and the
external nonvolatile configuration memory
RBI
Charge FET control output
Output to control the charge FET in the
Li-Ion pack protection circuitry
Serial memory clock
Output to clock the data transfer between
the bq2060 and the external nonvolatile
configuration memory
ESDA
Discharge FET control output
Current sense voltage input
Regulator output
Input to monitor instantaneous current
Output to control an n-JFET for VCC regulation to the bq2060 from the battery potential
VOUT
SR1–
SR2
Input connections for a small value sense
resistor to monitor the battery charge and
discharge current flow
Supply output
Output that supplies power to the external
EEPROM configuration memory
VCC
Supply voltage input
VSS
Ground
DISP
Display control input
VCELL1–
VCELL4
Single-cell voltage inputs
Inputs that monitor the series element cell
voltages
SMBD
SMBus data
Open-drain bidirectional pin used to transfer address and data to and from the
bq2060
Input that controls the LED drivers
LED1–LED5
LED1–
LED5
Sense resistor inputs
LED display segment outputs
SMBC
Outputs that each may drive an external
LED
SMBus clock
Open drain bidirectional pin used to clock
the data transfer to and from the bq2060
2
bq2060
The VFC measures bipolar signals up to 250mV. The
bq2060 detects charge activity when VSR = VSR2 – VSR1
is positive and discharge activity when VSR = VSR2 –
VSR1 is negative. The bq2060 continuously integrates
the signal over time using an internal counter. The
fundamental rate of the counter is 6.25µVh.
Functional Description
General Operation
The bq2060 determines battery capacity by monitoring
the amount of charge input or removed from a rechargeable battery. In addition to measuring charge and discharge, the bq2060 measures battery voltage, temperature, and current, estimates battery self-discharge, and
monitors the battery for low-voltage thresholds. The
bq2060 measures charge and discharge activity by monitoring the voltage across a small-value series sense resistor between the battery’s negative terminal and the
negative terminal of the battery pack. The available
battery charge is determined by monitoring this voltage
and correcting the measurement for environmental and
operating conditions.
Offset Calibration
The bq2060 provides an auto-calibration feature to cancel
the voltage offset error across SR1 and SR2 for maximum
charge measurement accuracy. The calibration routine is
initiated by issuing a command to ManufacturerAccess().
The bq2060 is capable of automatic offset calibration down
to 6.25µV. Offset cancellation resolution is less than 1µV.
Digital Filter
The bq2060 does not measure charge or discharge
counts below the digital filter threshold. The digital filter threshold is programmed in the EEPROM and
should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the
sense resistor.
Figure 1 shows a typical bq2060-based battery pack application. The circuit consists of the LED display, voltage and temperature measurement networks, EEPROM
connections, a serial port, and the sense resistor. The
EEPROM stores basic battery pack configuration information and measurement calibration values. The
EEPROM must be programmed properly for bq2060 operation. Table 10 shows the EEPROM memory map and
outlines the programmable functions available in the
bq2060.
Voltage
While monitoring SR1 and SR2 for charge and discharge
currents, the bq2060 monitors the battery-pack potential and the individual cell voltages through the
VCELL1–VCELL4 pins. The bq2060 measures the pack
voltage and reports the result in Voltage(). The bq2060
can also measure the voltage of up to four series elements in a battery pack. The individual cell voltages
are stored in the optional Manufacturer Function area.
The bq2060 accepts an NTC thermistor (Semitec 103AT)
for temperature measurement. The bq2060 uses the
thermistor temperature to monitor battery pack temperature, detect a battery full charge condition, and compensate for self-discharge and charge/discharge battery
efficiencies.
The VCELL1–VCELL4 inputs are divided down from the
cells using precision resistors, as shown in Figure 1. The
maximum input for VCELL1–VCELL4 is 1.25V with respect to VSS. The voltage dividers for the inputs must be
set so that the voltages at the inputs do not exceed the
1.25V limit under all operating conditions. Also, the divider ratios on VCELL1–VCELL2 must be half of that of
VCELL3–VCELL4. To reduce current consumption from
the battery, the CVON output may used to connect the
divider to the cells only during measurement period.
CVON is high impedance for 250ms (12.5% duty cycle)
when the cells are measured, and driven low otherwise.
See Table 1.
Measurements
The bq2060 uses a fully differential, dynamically balanced voltage-to-frequency converter (VFC) for charge
measurement and a sigma delta analog-to-digital converter (ADC) for battery voltage, current, and temperature measurement.
Voltage, current, and temperature measurements are
made every 2–2.5 seconds, depending on the bq2060 operating mode. Maximum times occur with compensated
EDV, mWh mode, and maximum allowable discharge
rate. Any AtRate computations requested or scheduled
(every 20 seconds) may add up to 0.5 seconds to the time
interval.
Current
The SRC input of the bq2060 measures battery charge
and discharge current. The SRC ADC input converts
the current signal from the series sense resistor and
stores the result in Current(). The full-scale input range
to SBC is limited to ±250mV as shown in Table 2.
Charge and Discharge Counting
The VFC measures the charge and discharge flow of the
battery by monitoring a small-value sense resistor
between the SR1 and SR2 pins as shown in Figure 1.
3
bq2060
Figure 1. Battery Pack Application Diagram–LED Display and Series Cell Monitoring
4
bq2060
Table 1. Example VCELL1–VCELL4 Divider
and Input Range
Voltage Input
VCELL4
VCELL3
VCELL2
VCELL1
Voltage Division
Ratio
16
16
8
8
Temperature
The TS input of the bq2060 in conjunction with an NTC
thermistor measures the battery temperature as shown
in Figure 1. The bq2060 reports temperature in Temperature(). THON may be used to connect the bias
source to the thermistor when the bq2060 samples the
TS input. THON is high impedance for 60ms when the
temperature is measured, and driven low otherwise.
Full-Scale Input
(V)
20.0
20.0
10.0
10.0
Gas Gauge Operation
General
Table 2. SRC Input Range
Sense Resistor (W)
Full-Scale Input
(A)
0.02
±12.5
0.03
±8.3
0.05
±5.0
0.10
±2.5
The operational overview in Figure 2 illustrates the gas
gauge operation of the bq2060. Table 3 describes the
bq2060 registers.
The bq2060 accumulates a measure of charge and discharge currents and estimates self-discharge of the battery. The bq2060 compensates the charge current measurement for temperature and state-of-charge of the
battery. The bq2060 also adjusts the self-discharge estimation based on temperature.
The main counter RemainingCapacity() (RM) represents
the available capacity or energy in the battery at any
Figure 2. bq2060 Operational Overview
5
bq2060
given time. The bq2060 adjusts RM for charge,
self-discharge, and leakage compensation factors. The
information in the RM register is accessible through the
communications ports and is also represented through
the LED display.
Discharge Count Register (DCR)
The DCR register counts up during discharge, independent of RM. DCR can continue to count even after RM has
counted down to 0. Prior to RM = 0, discharge activity,
light discharge estimation and self-discharge increment
DCR. After RM = 0, only discharge activity increments
DCR. The bq2060 initializes DCR to FCC – RM when
RM is within twice the programmed value in Near Full
EE 0x55. The DCR initial value of FCC – RM is reduced
by FCC/128 if SC = 0 (bit 2 in Control Mode) and is not
reduced if SC = 1. DCR stops counting when the battery
voltage reaches the EDV2 threshold on discharge.
The FullChargeCapacity() (FCC) register represents the
last measured full discharge of the battery. It is used as
the battery’s full-charge reference for relative capacity
indication. The bq2060 updates FCC when the battery
undergoes a qualified discharge from nearly full to a low
battery level. FCC is accessible through the serial communications ports.
The Discharge Count Register (DCR) is a non-accessible
register that only tracks discharge of the battery. The
bq2060 uses the DCR register to update the FCC register if the battery undergoes a qualified discharge from
nearly full to a low battery level. In this way, the
bq2060 learns the true discharge capacity of the battery
under system use conditions.
Capacity Learning (FCC Update) and Qualified
Discharge
The bq2060 updates FCC with an amount based on the
value in DCR if a qualified discharge occurs. The new
value for FCC equals the DCR value plus the programmable nearly full and low battery levels, according to
the following equation:
Main Gas Gauge Registers
FCC(new) = DCR(final) =
DCR(initial) + measured discharge to EDV2
+(FCC´ BatteryLow%)
RemainingCapacity() (RM)
RM represents the remaining capacity in the battery.
The bq2060 computes RM in either mAh or 10mWh depending on the selected mode.
(1)
where
BatteryLow% = (value stored in EE 0x54) ¸ 2.56
On initialization, the bq2060 sets RM to 0. RM counts
up during charge to a maximum value of FCC and down
during discharge and self-discharge to 0. In addition to
charge and self-discharge compensation, the bq2060 calibrates RM at three low-battery-voltage thresholds,
EDV2, EDV1, and EDV0 and three programmable
midrange thresholds VOC25, VOC50, and VOC75. This
provides a voltage-based calibration to the RM counter.
A qualified discharge occurs if the battery discharges
from RM ≥ FCC - Near Full * 2 to the EDV2 voltage
threshold with the following conditions:
n
DesignCapacity() (DC)
n
The DC is the user-specified battery full capacity. It is
calculated from Pack Capacity EE 0x3a–0x3b and is represented in mAh or 10mWh. It also represents the
full-battery reference for the absolute display mode.
n
n
FullChargeCapacity() (FCC)
FCC is the last measured discharge capacity of the battery. It is represented in either mAh or 10mWh depending on the selected mode. On initialization, the bq2060
sets FCC to the value stored in Last Measured Discharge EE 0x38–0x39. During subsequent discharges,
the bq2060 updates FCC with the last measured discharge capacity of the battery. The last measured discharge of the battery is based on the value in the DCR
register after a qualified discharge occurs. Once updated, the bq2060 writes the new FCC value to
EEPROM in mAh to Last Measured Discharge. FCC
represents the full battery reference for the relative display mode and relative state of charge calculations.
n
No valid charge activity occurs during the discharge
period. A valid charge is defined as an input of
10mAh into the battery.
No more than 256mAh of self-discharge and/or light
discharge estimation occurs during the discharge
period.
The temperature does not drop below 5°C during the
discharge period.
The battery voltage reaches the EDV2 threshold
during the discharge period and the voltage was less
than the EDV2 threshold minus 256mV when the
bq2060 detected EDV2.
No midrange voltage correction occurs during the
discharge period.
FCC cannot be reduced by more than 256mAh or increased by more than 512mAh during any single update
cycle. The bq2060 saves the new FCC value to the
EEPROM within 4s of being updated.
6
bq2060
Table 3. bq2060 Register Functions
Function
Command Code
SMBus
HDQ16
SMBus
Access
Units
ManufacturerAccess
0x00
0x00
read/write
n/a
RemainingCapacityAlarm
0x01
0x01
read/write
mAh, 10mWh
RemainingTimeAlarm
0x02
0x02
read/write
minutes
BatteryMode
0x03
0x03
read/write
n/a
AtRate
0x04
0x04
read/write
mA, 10mW
AtRateTimeToFull
0x05
0x05
read
minutes
AtRateTimeToEmpty
0x06
0x06
read
minutes
AtRateOK
0x07
0x07
read
Boolean
Temperature
0x08
0x08
read
0.1°K
Voltage
0x09
0x09
read
mV
Current
0x0a
0x0a
read
mA
AverageCurrent
0x0b
0x0b
read
mA
MaxError
0x0c
0x0c
read
percent
percent
RelativeStateOfCharge
0x0d
0x0d
read
AbsoluteStateOfCharge
0x0e
0x0e
read
percent
RemainingCapacity
0x0f
0x0f
read
mAh, 10mWh
FullChargeCapacity
0x10
0x10
read
mAh, 10mWh
RunTimeToEmpty
0x11
0x11
read
minutes
AverageTimeToEmpty
0x12
0x12
read
minutes
AverageTimeToFull
0x13
0x13
read
minutes
ChargingCurrent
0x14
0x14
read
mA
ChargingVoltage
0x15
0x15
read
mV
Battery Status
0x16
0x16
read
n/a
CycleCount
0x17
0x17
read
cycles
DesignCapacity
0x18
0x18
read
mAh, 10mWh
DesignVoltage
0x19
0x19
read
mV
SpecificationInfo
0x1a
0x1a
read
n/a
ManufactureDate
0x1b
0x1b
read
n/a
SerialNumber
0x1c
0x1c
read
integer
Reserved
0x1d–0x1f
0x1d - 0x1f
-
-
ManufacturerName
0x20
0x20–0x25
read
string
string
DeviceName
0x21
0x28–0x2b
read
DeviceChemistry
0x22
0x30–0x32
read
string
ManufacturerData
0x23
0x38–0x3b
read
string
n/a
Pack Status
0x2f (LSB)
0x2f (LSB)
read/write
Pack Configuration
0x2f (MSB)
0x2f (MSB)
read/write
n/a
VCELL4
0x3c
0x3c
read/write
mV
VCELL3
0x3d
0x3d
read/write
mV
VCELL2
0x3e
0x3e
read/write
mV
VCELL1
0x3f
0x3f
read/write
mV
7
bq2060
of the self-discharge estimation at a given temperature
to the rate programmed for 25°C (Y% per day):
Table 4. State of Charge Based
on Low Battery Voltage
Threshold
EDV0
EDV1
EDV2
State of Charge in RM
0%
3%
Battery Low %
Self-Discharge Rate
Temperature ( C)
Temp < 10
1
Y%
4
1
Y%
2
10 ≤ Temp <20
20 ≤ Temp <30
per day
per day
Y% per day
30 ≤ Temp <40
2Y% per day
End-of-Discharge Thresholds and Capacity Correction
40 ≤ Temp <50
4Y% per day
50 ≤ Temp <60
8Y% per day
The bq2060 monitors the battery for three low-voltage
thresholds, EDV0, EDV1, and EDV2. The EDV thresholds are programmed in EDVF/EDV0 EE 0x72–0x73,
EMF/EDV1 EE 0x74–0x75, and EDV C1/C0 Factor/EDV2 EE 0x78–0x79. If the CEDV bit in Pack Configuration is set, automatic EDV compensation is enabled and the bq2060 computes the EDV0, EDV1, and
EDV2 thresholds based on the values in EE 0x72–0x7d,
0x06, and the battery’s current discharge rate, temperature, capacity, and cycle count. The bq2060 disables
EDV detection if Current() exceeds the Overload Current
threshold programmed in EE 0x46 - EE 0x47. The
bq2060 resumes EDV threshold detection after Current() drops below the overload current threshold. Any
EDV threshold detected will be reset after 10mAh of
charge are applied.
60 ≤ Temp <70
16Y% per day
70≤ Temp
32Y% per day
The interval at which RM is reduced is given by the following equation, where n is the appropriate factor of 2
(n = 14 , 12 , 1, 2, . . . ):
(2)
Self - Discharge Update Time =
640·13500
256· n · (Y % per day)
seconds
The timer that keeps track of the self-discharge update
time is halted whenever charge activity is detected. The
timer is reset to zero if the bq2060 reaches the
RemainingCapacity()=FullChargeCapacity() condition
while charging.
The bq2060 uses the thresholds to apply voltage-based
corrections to the RM register according to Table 4.
Example: If T = 35°C (n = 2) and programmed
self-discharge rate Y is 2.5 (2.5% per day at 25°C), the
bq2060 reduces RM by RM/256 (0.39%) every
The bq2060 adjusts RM as it detects each threshold. If
the voltage threshold is reached before the corresponding capacity on discharge, the bq2060 reduces RM to the
appropriate amount as shown in Table 4. If RM reaches
the capacity level before the voltage threshold is reached
on discharge, the bq2060 prevents RM from decreasing
until the battery voltage reaches the corresponding
threshold.
(3)
640·13500
256· n· (Y % per day)
= 6750 seconds
Self-Discharge
The bq2060 estimates the self-discharge of the battery
to maintain an accurate measure of the battery capacity
during periods of inactivity. The algorithm for
self-discharge estimation takes a programmed estimate
for the expected self-discharge rate at 25°C stored in
EEPROM and makes a fixed reduction to RM of an
amount equal to RemainingCapacity()/256. The bq2060
makes the fixed reduction at a varying time interval
that is adjusted to achieve the desired self-discharge
rate. This method maintains a constant granularity of
0.39% for each self-discharge adjustment, which may be
performed multiple times per day, instead of once per
day with a potentially large reduction.
The self-discharge estimation rate for 25°C is doubled
for each 10 degrees above 25°C or halved for each 10 degrees below 25°C. The following table shows the relation
Figure 3. Self-Discharge at 2.5%/Day @25C
8
bq2060
This means that a 0.39% reduction of RM will be made
12.8 times per day to achieve the desired 5% per day reduction at 35°C.
For the midrange corrections to occur, the temperature
must be in the range of 19°C to 31°C inclusive and the
Current() and AverageCurrent() must both be between
–64mA and 0. The bq2060 makes midrange corrections
as shown in Table 5.
Figure 3 illustrates how the self-discharge estimate algorithm adjusts RemainingCapacity() vs. temperature.
Light Discharge or Suspend C u r r en t
Compensation
Charge Control
The bq2060 can be configured in two ways to compensate for small discharge currents that produce a signal
below the digital filter. First, the bq2060 can decrement
RM and DCR at a rate determined by the value stored
in Light Discharge Current EE 0x2b when it detects no
discharge activity and the SMBC and SMBD lines are
high. Light Discharge Current has a range of 44µA to
11.2mA.
The bq2060 supports SBS charge control by broadcasting
the ChargingCurrent() and ChargingVoltage() to the
Smart Charger address. The bq2060 broadcasts the requests every 10s. The bq2060 updates the values used in
the charging current and voltage broadcasts based on the
battery’s state of charge, voltage, and temperature. The
fast-charge rate is programmed in Fast-Charging Current
EE 0x1a - 0x1b while the charge voltage is programmed in
Charging Voltage EE 0x0a-0x0b.
Charging Voltage and Current Broadcasts
Alternatively, the bq2060 can be configured to disable
the digital filter for discharge when the SMBC and
SMBD lines are high. In this way, the digital filter will
not mask the leakage current signal. The bq2060 is configured in this mode by setting the NDF bit in Control
Mode.
The bq2060 internal charge control is compatible with
popular rechargeable chemistries. The primary
charge-termination techniques include a change in temperature over a change in time (∆T/∆t) and current
taper, for nickel-based and Li-Ion chemistries, respectively. The bq2060 also provides pre-charge qualification and a number of safety charge suspensions based
on current, voltage, temperature, and state of charge.
Midrange Capacity Corrections
The bq2060 applies midrange capacity corrections when
the VCOR bit is set in Pack Configuration. The bq2060
adjusts RM to the associated percentage at three different voltage levels VOC25, VOC50, and VOC75. The VOC
values represent the open circuit battery voltage at
which RM corresponds to the associated state of charge
for each threshold.
Alarm Broadcasts to Smart Charger and Host
If any of the bits 8–15 in BatteryStatus() is set, the
bq2060 broadcasts an AlarmWarning() message to the
Host address. If any of the bits 12–15 in BatteryStatus()
are set, the bq2060 also sends an AlarmWarning() message to the Smart Charger address. The bq2060 repeats
the AlarmWarning() message every 10s until the bits are
cleared.
Threshold
Associated State of Charge
VOC25
25%
Pre-Charge Qualification
VOC50
50%
VOC75
75%
The bq2060 sets ChargingCurrent() to the pre-charge
rate as programmed in Pre-Charge Current EE
0x1e-0x1f under the following conditions:
Table 5. Midrange Corrections
Condition
Voltage()
Result
≥ VOC75 and RelativeStateOfCharge() ≤ 63%
RelativeStateOfCharge()→75%
< VOC75 and RelativeStateOfCharge() ≥ 87%
RelativeStateOfCharge()→75%
≥VOC50 and RelativeStateOfCharge() ≤ 38%
RelativeStateOfCharge()→50%
<VOC50 and RelativeStateOfCharge() ≥ 62%
RelativeStateOfCharge()→50%
≥ VOC25 and RelativeStateOfCharge() ≤ 13%
RelativeStateOfCharge()→25%
< VOC25 and RelativeStateOfCharge() ≥ 37%
RelativeStateOfCharge()→25%
9
bq2060
n
n
The over-temperature condition is cleared when
Temperature() is equal to or below (Max T – 5°C).
Voltage: The bq2060 requests the pre-charge charge
rate when Voltage() drops below the EDV0 threshold
(compensated or fixed EDVs). Once requested, a
pre-charge rate remains until Voltage() increases
above the EDVF threshold. The bq2060 also
broadcasts the pre-charge value immediately after a
device reset until Voltage() is above the EDVF
threshold. This threshold is programmed in
EDVF/EDV0 EE 0x72-0x73.
n
Temperature: The bq2060 requests the pre-charge
rate when Temperature() is between 0°C and 5°C.
Temperature() must rise above 5°C before the bq2060
requests the fast-charge rate.
Charge Suspension
The bq2060 may temporarily suspend charge if it detects a charging fault. A charging fault includes the following conditions.
n
n
n
Overcurrent: An overcurrent condition exists when
the bq2060 measures the charge current to be more than
the Overcurrent Margin above the ChargingCurrent().
Overcurrent Margin is programmed in EE 0x49. On
detecting an overcurrent condition, the bq2060 sets the
ChargingCurrent()
to
zero
and
sets
the
TERMINATE_CHARGE_ALARM bit in Battery
Status(). The overcurrent condition and TERMINATE_
CHARGE_ALARM are cleared when the measured
current drops below the ChargingCurrent plus the
Overcurrent Margin.
n
Overcharge: An overcharge condition exists if the
battery is charged more than the Maxmum
Overcharge value after RM = FCC. Maximum
Overcharge is programmed in EE 0x2e–0x2f. On
detecting an overcharge condition, the bq2060 sets
the ChargingCurrent() to zero and sets the
OVER_CHARGED_ALARM, TERMINATE_CHARGE_
ALARM,
and
FULLY_CHARGED
bits
in
BatteryStatus(). The bq2060 clears the OVER_
CHARGED_ALARM and TERMINATE_CHARGE_
ALARM when it detects that the battery is no longer
being charged. The FULLY_CHARGED bit remains set
and the bq2060 continues to broadcast zero charging
current until RelativeStateOfCharge() is less than
Fully Charged Clear% programmed in EE 0x4c.The
counter used to track overcharge capacity is reset
with 2mAh of discharge.
Under-Temperature:
An
under-temperature
condition exists if Temperature() < 0°C. On detecting
an under temperature condition, the bq2060 sets
ChargingCurrent() to zero. The bq2060 sets
ChargingCurrent() to the appropriate pre-charge rate
or fast-charge rate when Temperature() ≥ 0°C.
Primary Charge Termination
T h e b q 2 0 6 0 t er m in a t es c h a r g e if it d et ec t s a
charge-termination condition. A charge-termination
condition includes the following.
Overvoltage: An overvoltage condition exists when the
bq2060 measures the battery voltage to be more than
the Overvoltage Margin above the ChargingVoltage() or
a Li-Ion cell voltage has exceeded the overvoltage limit
programmed in Cell Under-/Overoltage. Overvoltage
Margin is programmed in EE 0x48 and Cell Under/Over
Voltage in EE 0x4a (least significant nibble). On
detecting an overvoltage condition, the bq2060 sets the
ChargingCurrent()
to
zero
and
sets
the
TERMINATE_CHARGE_ALARM bit in BatteryStatus().
The
bq2060
clears
the
TERMINATE_
CHARGE_ALARM bit when it detects that the battery
is no longer being charged (DISCHARGING bit set in
BatteryStatus()). The bq2060 continues to broadcast zero
charging current until the overvoltage condition is
cleared. The overvoltage condition is cleared when the
measured
battery
voltage
drops
below
the
ChargingVoltage() plus the Overvoltage Margin or when
the CVOV bit is reset.
n
∆T/∆t: For ∆T/∆t, the bq2060 detects a change in
temperature over many seconds. The ∆T/∆t setting
is programmable in both the temperature step,
DeltaT (1.6°C - 4.6°C), and the time step, DeltaT
Time (20s-320s). Typical settings for 1°C/minute
include 2°C/120s and 3°C/180s. Longer times are
required for increased slope resolution. The DeltaT
value is programmed in EE 0x45 (least significant
nibble) and the Delta T Time in EE 0x4e.
In addition to the ∆T/∆t timer, a hold-off timer starts
when the battery is being charged at more than
255mA and the temperature is above 25°C. Until this
timer expires, ∆T/∆t detection is suspended. If
Current() drops below 256mA or Temperature() below
25°C, the hold-off timer resets and restarts only when
the current and temperature conditions are met again.
The hold-off timer is programmable (20s – 320s) with
Holdoff Time value in EE 0x4f.
Over-Temperature: An over-temperature condition
exists when Temperature() is greater than or equal to
the Max T value programmed in EE 0x45 (most
significant nibble). On detecting an over-temperature
condition, the bq2060 sets the ChargingCurrent() to
zero and sets the OVER_TEMP_ALARM and
TERMINATE_CHARGE_
ALARM
bit
in
BatteryStatus() and the CVOV bit in Pack Status.
n
10
Current Taper: For current taper, ChargingVoltage()
must be set to the pack voltage desired during the
constant-voltage phase of charging. The bq2060 detects a
current taper termination when the pack voltage is
greater than the voltage determined by Current Taper
Qual Voltage in EE 0x4f and the charging current is
below a threshold determined by Current Taper
bq2060
Threshold in EE 0x4e, for at least 40s. The bq2060 uses
the VFC to measure current for current taper
termination. The current polarity must remain positive as
measured by the VFC during this time.
display timer expires. The bq2060 requires the DISP input to remain stable for a minimum of 250ms to detect
the logic state.
If the EDV0 bit is set, the bq2060 disables the LED display. The display is also disabled during a VFC calibration and should be turned off before entering low-power
storage mode.
Once the bq2060 detects a primary charge termination,
the bq2060 sets the TERMINATE_CHARGE_ALARM
and FULLY_CHARGED bits in BatteryStatus(), and
sets the ChargingCurrent() to the maintenance charge
rate as programmed in Maintenance Charging Current
EE 0x1c–0x1d. On termination, the bq2060 also sets
RM to a programmed percentage of FCC, provided that
RelativeStateOfCharge() is below the desired
percentage of FCC and the CSYNC bit in Pack Configuration EE 0x3f is set. If the CSYNC bit is not set and
RelativeStateOfCharge() is less than the programmed
percentage of FCC, the bq2060 clears the
FULLY_CHARGED bit in BatteryStatus(). The programmed percentage of FCC, Fast Charge Termination
%, is set in EE 0x4b. The bq2060 clears the
FULLY_CHARGED bit when RelativeStateOfCharge()
is less than the programmed Fully Charged Clear %.
The bq2060 broadcasts the fast-charge rate when the
FULLY_CHARGED bit is cleared and voltage and temperature permit. The bq2060 clears the TERMINATE_CHARGE_ALARM when it no longer detects
that the battery is being charged or it no longer detects
the termination condition. See Table 6 for a summary
of BatteryStatus() alarm and status bit operation.
Display Modes
In relative mode, each LED output represents 20% or
25% of the RelativeStateOfCharge() value. In absolute
mode, each LED output represents 20% or 25% of the
AbsoluteStateOfCharge() value. Table 7 shows the display operation.
In either mode, the bq2060 blinks the LED display if
R em a in in g C a p a c it y ( ) is les s t h a n R em a in in g
CapacityAlarm(). The display is disabled if EDV0 = 1.
Secondary Protection for Li-Ion
Undervoltage and overvoltage thresholds may be programmed in the byte value Cell Under/Over Voltage EE
0x4a to set a secondary level of protection for Lithium
Ion cells. The bq2060 checks individual cell voltages for
undervoltage and overvoltage conditions. The bq2060
displays the results in the Pack Status register and controls the state of the FET control outputs CFC and DFC.
If any cell voltage is less than the VUV threshold, the
bq2060 sets the CVUV bit in Pack Status and pulls the
DFC pin to a logic low. If any cell voltage is greater than
the VOV threshold, the bq2060 sets the CVOV bit in Pack
Status and pulls the CFC pin to a logic low.
Display Port
General
The display port drives a 4 or 5 LED bar-graph display.
The display is activated by a logic signal on the DISP input. The bq2060 can display RM in either a relative or
absolute mode with each LED representing a percentage
of the full-battery reference. In relative mode, the
bq2060 uses FCC as the full-battery reference; in absolute mode, it uses DC.
Low-Power Storage Mode
The bq2060 enters low-power mode 5– 8s after receiving
the Enable Low-Power command. In this mode the
bq2060 consumes less than 10µA. A rising edge on
SMBC, SMBD, or HDQ16 restores the bq2060 to the full
operating mode. The bq2060 does not perform any gas
gauge functions during low-power storage mode.
The DMODE bit in Pack Configuration programs the
bq2060 for the absolute or relative display mode. The
LED bit in Control Mode programs the 4 or 5 LED option. A 5th LED can be used with the 4 LED display option to show when the battery capacity is ≥ to 100%.
Device Reset
The bq2060 can be reset with commands over the
HDQ16 or SMBus. Upon reset, the bq2060 initializes its
internal registers with the information contained in the
configuration EEPROM. The following command sequence initiates a full bq2060 reset:
Activation
The display may be activated at any time by a
high-to-low transition on the DISP input. This is usually
accomplished with a pullup resistor and a pushbutton
switch. Detection of the transition activates the display and starts a four-second display timer. The timer
expires and turns off the display whether DISP was
brought low momentarily or held low indefinitely. Reactivation of the display requires that the DISP input return to a logic-high state and then transition low again.
The second high-to-low transition must occur after the
Write 0x4f to 0xff5a
Write 0x7d to 0x0000
Write 0x7d to 0x0080
11
bq2060
Table 6. Alarm and Status Bit Summary
Battery State
Conditions
Overcurrent
C() ≥ CC() + Overcurrent
Margin
Overvoltage
V() ≥ CV() + Overvoltage
Margin
VCELL1, 2, 3, or 4 > Cell
Over Voltage
CC() State and
BatteryStatus Bits Set
CC() = Fast or Pre-charge Current
and/or Bits Cleared
CC() = 0, TCA = 1
C() < CC() + Overcurrent Margin
TCA = 1
DISCHARGING = 1
CC() = 0, CVOV = 1
V() < CV() + Overvoltage Margin
Li-Ion cell voltage ≤ Cell Over Voltage
Overtemperature
T() ≥ Max T
CC() = 0, OTA = 1,
TCA = 1, CVOV = 1
T() ≤ Max T - 5°C or T() ≤ 43°C
Capacity added after
RM() = FCC() ≥
Maximum Overcharge
CC() = 0, FC = 1
RSOC() < Fully Charged Cleared %
Overcharge
OCA = 1, TCA = 1
DISCHARGING = 1
T() < 0°C
CC() = 0
0°C ≤ Τ() < 5°C, CC() = Pre-Charge
Current
T() ≥ 5°C, CC() = Fast-Charging Current
CC() = Maintenance
Charging Current,
FC = 1
RSOC() < Fully Charged Cleared %
TCA = 1
DISCHARGING = 1 or termination
condition is no longer valid.
V() ≤ EDV2
FD = 1
RSOC() > 20%
V() ≤ EDV0
TDA = 1
V() > EDV0
VCELL1, 2, 3 or 4 < Cell
Under Voltage
TDA = 1, CVUV = 1
VCELL1, 2, 3, or 4 ≥ Cell Under Voltage
Low capacity
RM() < RCA()
RCA = 1
RM() ≥ RCA()
Low run-time
ATTE() < RTA()
RTA = 1
ATTE() ≥ RTA()
Undertemperature
Fast charge
termination
Fully discharged
Overdischarged
Note:
∆T/∆t or Current Taper
C() = Current(), CV() = ChargingVoltage(), CC() = ChargingCurrent(), V() = Voltage(), T() = Temperature(), TCA = TERMINATE_CHARGE_ALARM, OTA = OVER_TEMPERATURE_ALARM,
OCA = OVER_CHARGED_ALARM, TDA = TERMINATE_DISCHARGE_ALARM, FC =
FULLY_CHARGED,
FD = FULLY_DISCHARGED, RSOC() = RelativeStateOfCharge(). RM() = RemainingCapacity(),
RCA = REMAINING_CAPACITY_ALARM, RTA = REMAINING_TIME_ALARM,
ATTE() = AverageTimeToEmpty(), RTA() = RemainingTimeAlarm(), RCA() = RemainingCapacityAlarm(),
FCC() = FullChargeCapacity.
12
bq2060
Table 7A. Display Mode
Condition
Relative or
Absolute
StateOfCharge()
Table 7B. Display Mode
5 LED Display Option
Condition
Relative or
Absolute
StateOfCharge()
4 LED Display Option
LED1
LED2 LED3 LED4 LED5
LED1
LED2
LED3
LED4
EDV0 = 1
OFF
OFF
OFF
OFF
OFF
EDV0 = 1
OFF
OFF
OFF
OFF
<20%
ON
OFF
OFF
OFF
OFF
<25%
ON
OFF
OFF
OFF
≥20%, <40%
ON
ON
OFF
OFF
OFF
≥25%, <50%
ON
ON
OFF
OFF
≥40%, <60%
ON
ON
ON
OFF
OFF
≥50%, <75%
ON
ON
ON
OFF
≥60%, <80%
ON
ON
ON
ON
OFF
≥75%
ON
ON
ON
ON
≥80%
ON
ON
ON
ON
ON
SMBus Protocol
Communication
The bq2060 supports the following SMBus protocols:
The bq2060 includes two types of communication ports:
SMBus and HDQ16. The SMBus interface is a 2-wire
bidirectional protocol using the SMBC (clock) and SMBD
(da t a ) p i ns . T he H D Q 1 6 i nte r f a c e i s a 1 - w ir e
bidirectional protocol using the HDQ16 pin. All three
communication lines are isolated from VCC and may be
pulled-up higher than VCC. Also, the bq2060 will not
pull these lines low if VCC to the part is zero . HDQ16
should be pulled down with a 100KΩ resistor if not used.
n
Read Word
n
Write Word
n
Read Block
A processor acting as the bus master uses the three protocols to communicate with the bq2060. The bq2060 acting as the bus master uses the Write Word protocol.
The SMBD and SMBC pins are open drain and require
external pullup resistors.
The communication ports allow a host controller, an
SMBus compatible device, or other processor to access
the memory registers of the bq2060. In this way a system can efficiently monitor and manage the battery.
SMBus Packet Error Checking
The bq2060 supports Packet Error Checking as a mechanism to confirm proper communication between it and
another SMBus device. Packet Error Checking requires
that both the transmitter and receiver calculate a Packet
Error Code (PEC) for each communication message. The
device that supplies the last byte in the communication
message appends the PEC to the message. The receiver
compares the transmitted PEC to its PEC result to determine if there is a communication error.
SMBus
The SMBus interface is a command-based protocol. A
processor acting as the bus master initiates communication to the bq2060 by generating a START condition. A
START condition consists of a high-to-low transition of
the SMBD line while the SMBC is high. The processor
then sends the bq2060 device address of 0001011 (bits
7–1) plus a R/W bit (bit 0) followed by an SMBus command code. The R/W bit and the command code instruct
the bq2060 to either store the forthcoming data to a register specified by the SMBus command code or output
the data from the specified register. The processor completes the access with a STOP condition. A STOP condition consists of a low-to-high transition of the SMBD
line while the SMBC is high. With SMBus, the most significant bit of a data byte is transmitted first.
PEC Protocol
The bq2060 can receive or transmit data with or without
PEC. Figure 4 shows the communication protocol for
the Read Word, Write Word, and Read Block messages
without PEC. Figure 5 includes PEC.
In the Write Word protocol, the bq2060 receives the PEC
after the last byte of data from the host. If the host does
not support PEC, the last byte of data is followed by a
STOP condition. After receipt of the PEC, the bq2060
compares the value to its calculation. If the PEC is correct, the bq2060 responds with an ACKNOWLEDGE. If
it is not correct, the bq2060 responds with a NOT ACKNOWLEDGE and sets an error code.
In some instances, the bq2060 acts as the bus master.
This occurs when the bq2060 broadcasts charging requirements and alarm conditions to device addresses
0x12 (SBS Smart Charger) and 0x10 (SBS Host Controller.)
13
bq2060
1
S
7
Battery Address
0001011
1
1
8
1
8
1
8
1
1
0
A
Command Code
A
Data byte low
A
Data byte high
A
P
Write Word
1
S
7
Battery Address
0001011
1
1
8
1
1
7
1
1
0
A
Command Code
A
S
Battery Address
1
A
8
1
8
1
Data byte low
A
Data byte high
A
P
Host Processor
Read Word
1
S
7
Battery Address
0001011
1
1
8
1
1
7
1
1
0
A
Command Code
A
S
Battery Address
1
A
bq2060
8
1
8
1
8
1
8
1
1
Byte Count =N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
P
A – ACKNOWLEDGE
A – NOT ACKNOWLEDGE
S – START
P – STOP
Block Read
FG2060HCP.eps
Figure 4. SMBus Communication Protocol without PEC
1
S
7
Battery Address
0001011
1
1
8
1
8
1
8
1
0
A
Command Code
A
Data byte low
A
Data byte high
A
8
1
PEC
A
1
P
Write Word
1
S
7
Battery Address
0001011
1
1
8
1
1
7
1
1
0
A
Command Code
A
S
Battery Address
1
A
8
1
8
1
8
1
1
Data byte low
A
Data byte high
A
PEC
A
P
Host Processor
bq2060
Read Word
1
S
7
Battery Address
0001011
1
1
8
1
1
7
1
1
0
A
Command Code
A
S
Battery Address
1
A
A – ACKNOWLEDGE
A – NOT ACKNOWLEDGE
S – START
P – STOP
8
1
8
1
8
1
8
1
8
1
1
Byte Count =N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
PEC
A
P
Block Read
FG2060PEC.eps
Figure 5. SMBus Communication Protocol with PEC
14
bq2060
In the Read Word and Block Read, the host generates an
ACKNOWLEDGE after the last byte of data sent by the
bq2060. The bq2060 then sends the PEC and the host
acting as a master-receiver generates a NOT ACKNOWLEDGE and a STOP condition.
A bit transmission consists of three distinct sections. The
first section starts the transmission by either the host or
the bq2060 taking the HDQ16 pin to a logic-low state for
a period t S T R H ; B . The next section is the actual
data-transmission, where the data bit is valid by the
time, tDSU;B after the negative edge used to start communication. The data bit is held for a period tDH;DV to allow
the host processor or bq2060 to sample the data bit.
PEC Calculation
The basis of the PEC calculation is an 8-bit Cyclic Redundancy Check (CRC-8) based on the polynomial C(X)
= X8 + X2 + X1 + 1. The PEC calculation includes all
bytes in the transmission, including address, command,
and data. The PEC calculation does not include ACKNOWLEDGE, NOT ACKNOWLEDGE, START, STOP,
and Repeated START bits.
The final section is used to stop the transmission by returning the HDQ16 pin to a logic-high state by at least
the time tSSU;B after the negative edge used to start
communication. The final logic-high state should be until a period tCYCH;B to allow time to ensure that the bit
transmission was stopped properly.
For example, the host requests RemainingCapacity()
from the bq2060. This includes the host following the
Read Word protocol. The bq2060 calculates the PEC
based on the following 5 bytes of data, assuming the remaining capacity of the battery is 1001mAh.
n
Battery Address with R/W = 0: 0x16
n
Command Code for RemainingCapacity(): 0x0f
n
Battery Address with R/W = 1: 0x17
n
RemainingCapacity(): 0x03e9
If a communication error occurs (e.g., tCYCB > 250µs),
the host sends the bq2060 a BREAK to reinitiate the serial interface. The bq2060 detects a BREAK when the
HDQ16 pin is in a logic-low state for a time t B or
greater. The HDQ16 pin is then returned to its normal
ready-high logic state for a time tBR. The bq2060 is then
ready to receive a command from the host processor.
The HDQ16 pin is open drain and requires an external
pullup resistor.
Command Codes
For 0x160f17e903, the bq2060 transmits a PEC of 0xe8
to the host.
The SMBus Command Codes are in ( ), the HDQ16 in [ ].
Temperature(), Voltage(), Current(), and AverageCurrent(),
performance specifications are at regulated VCC (VRO)
and a temperature of 0–70°C.
PEC Enable in Master Mode
PEC for master mode broadcasts to the charger, host, or
both can be enabled/disabled with the combination of
the bits HPE and CPE in Control Mode.
ManufacturerAccess() (0x00); [0x00–0x01]
Description:
This function provides writable command codes to control the bq2060 during normal operation and pack manufacture. These commands can be ignored if sent within
one second after a device reset. The following list of commands are available.
SMBus On and Off State
The bq2060 detects whether the SMBus enters the Off
State” by monitoring the SMBC and SMBD lines. When
both signals are continually low for at least 2.5s, the
bq2060 detects the Off State. When the SMBC and
SMBD lines go high, the bq2060 detects the On State
and can begin communication within 1ms. One-MΩ
pulldown resistors on SMBC and SMBD are recommended for reliable Off State detection.
0x0618 Enable Low-Power Storage Mode: Activates
the low-power storage mode. The bq2060 enters the
storage mode after a 5–8s delay. The bq2060 accepts
other commands to ManufacturerAccess() during the
delay before entering low-power storage mode. The
LEDs must be off before entering the low-power storage
mode as the display state remains unchanged. During
the delay following the low-power storage command, a
VFC Calibration command may be issued.
HDQ16
The HDQ16 interface is a command-based protocol. (See
Figure 6.) A processor sends the command code to the
bq2060. The 8-bit command code consists of two fields,
the 7-bit HDQ16 command code (bits 0–6) and the 1-bit
R/W field. The R/W field directs the bq2060 either to
n
Store the next 16 bits of data to a specified register or
n
Output 16 bits of data from the specified register
The bq2060 clears the ManufacturerAccess() command
within 900ms of acknowledging the Enable Low-Power
Storage command. The VFC Calibration command must
be sent 900–1600ms after SMBus acknowledgment of
the Enable Low-Power Storage command. In this case,
the bq2060 delays entering storage mode until the calibration process completes and the bq2060 stores the
new calibration values in EEPROM.
With HDQ16, the least significant bit of a data byte
(command) or word (data) is transmitted first.
15
bq2060
0x062b SEAL Command: Instructs the bq2060 to restrict access to those functions listed in Table 3. Note:
The SEAL Command does not change the state of the
SEAL bit in Pack Configuration in EEPROM. The
bq2060 completes the seal function and clears
ManufacturerAccess() within 900ms of acknowledging
the command.
error. The bq2060 caps the calibration time at one hour
in the event of calibrating zero offset error. The VFC
calibration can be done as the last step in a battery pack
test procedure since the calibration can complete automatically after removal from a test setup.
The bq2060 clears ManufacturerAccess() within 900ms
and starts calibration within 3.2s of acknowledging the
command.
0x064d Charge Synchronization: Instructs the
bq2060 to update RM to a percentage of FCC as defined
in Fast Charge Termination %. The bq2060 updates RM
and clears ManufacturerAccess() within 900ms of acknowledging the command.
0x0660 Stop VFC Calibration: Instructs the bq2060
to abort a VFC calibration procedure. If aborted, the
bq2060 disables offset correction. The bq2060 stops calibration within 20ms of acknowledging the command.
0x0653 Enable VFC Calibration: Instructs the unsealed bq2060 to begin VFC calibration. With this command the bq2060 deselects the SR1 and SR2 inputs and
calibrates for IC offset only. It is best to avoid charge or
discharge currents through the sense resistor during
this calibration process.
0x0606 Program EEPROM: Instructs the unsealed
bq2060 to connect the SMBus to the EEPROM I2C bus.
The bq2060 applies power to the EEPROM within 900ms
of acknowledging the command. After issuing the program EEPROM command, the bq2060 monitoring functions are disabled until the I2C bus is disconnected. The
bq2060 disconnects the I2C bus when it detects that the
Battery Address 0x16 is sent over the SMBus. The Battery Address 0x16 to disconnect the I2C bus should not
be sent until 10ms after the last write to the EEPROM.
0x067e Alternate VFC Calibration: Instructs the
unsealed bq2060 to begin VFC calibration. With this
command the bq2060 does not deselect the SR1 and SR2
inputs and calibrates for IC and PCB offset. During
this procedure no charge or discharge currents
Example: The following sequence of actions is an example of how to use the ManufacturerAccess() commands
in an efficient manner to take a battery pack that has
completed all testing and calibration except for VFC calibration and to make it ready for shipment in the
SEALED state and in low-power storage mode:
1. Complete testing and calibration with desired final
values stored in EEPROM. This process includes
setting the SEAL bit in Pack Configuration.
Sending a reset command to the bq2060 during test
ensures that RAM values correspond to the final
EEPROM values
During VFC calibration, the bq2060 disables the LED
display and accepts only the Stop VFC Calibration and
the SEAL Command to ManufacturerAccess(). The
bq2060 disregards all other commands. SMBus
communication should be kept to a minimum during
VFC calibration to reduce the noise level and allow a
more accurate calibration.
Once started, the VFC calibration procedure completes
automatically. When complete, the bq2060 saves the calibration values in EEPROM. The calibration normally
takes about 8 to 10 minutes. The calibration time is inversely proportional to the bq2060 VFC (and PCB) offset
Send Host to bq2060
HDQ Command Code
Break
Send Host to bq2060 or
Receive from bq2060
16 bit Data
tRR
R/W
MSB
Bit7
LSB
Bit0
tRSPS
Start-bit
Address-Bit/
Data-Bit
Stop-Bit
TD2060CE.eps
Figure 6. HDQ16 Communication Example
16
bq2060
2.
If the initial value of RemainingCapacity() must be
non-zero, the desired value may be written to Command 0x26 with the pack unsealed. A reset sent after this step resets RM to zero.
3.
Issue the Enable Low-Power Storage Mode command.
4.
Within 900–1600ms after sending the Enable
Low-Power command, issue the Enable VFC Calibration command. This delays the low-power storage mode until after VFC calibration completion.
5.
Issue the SEAL Command subsequent to the VFC
Calibration command. The bq2060 must receive the
SEAL Command before VFC calibration completes.
The bq2060 resets the OCE bit in Pack Status
when calibration begins and sets the bit when calibration successfully completes.
Input/Output: Unsigned integer—value below which
Low Capacity messages are sent.
Battery Modes
CAPACITY_MODE CAPACITY_MODE
bit = 0
bit = 1
Units
mAh @ C/5
10mWh @ P/5
Range
0–65,535mAh
0–65,535 10mWh
Granularity
Not applicable
Accuracy
See RemainingCapacity()
RemainingTimeAlarm() (0x02); [0x02]
Description:
Sets or gets the remaining time alarm value. Whenever
the AverageTimeToEmpty() falls below the remaining time
value, the bq2060 sends AlarmWarning() messages to the
SMBus Host with the REMAINING_TIME_ALARM bit
set. A remaining time value of 0 effectively disables this
alarm. The bq2060 initially sets the remaining time value
to the Remaining Time Alarm value programmed in EE
0x02 - 0x03. The remaining time value remains unchanged
until altered by the RemainingTimeAlarm() function.
After VFC calibration completes automatically, the
bq2060 saves the VFC offset cancellation values in
EEPROM and enters the low-power storage mode in
about 20s. In addition, the bq2060 is sealed, allowing access as defined in Table 3 only.
Purpose:
The ManufacturerAccess() function provides the system
host access to bq2060 functions that are not defined by
the SBD.
Purpose:
The RemainingTimeAlarm() function can be used by
systems that want to adjust when the remaining time
alarm warning is sent. The remaining time value can
be read to verify the value in use by the bq2060’s
RemainingTimeAlarm().
SMBus Protocol: Read or Write Word
Input/Output: Word
RemainingCapacityAlarm() (0x01); [0x01]
SMBus Protocol: Read or Write Word
Description:
Sets or gets the low-capacity threshold value. Whenever
the RemainingCapacity() falls below the low capacity
value, the bq2060 sends AlarmWarning() messages to
the SMBus Host with the REMAINING_CAPACITY_ALARM bit set. A low-capacity value of 0 disables
this alarm. The bq2060 initially sets the low-capacity
value to Remaining Capacity Alarm value programmed
in EE 0x04 - 0x05. The low-capacity value remains unch a n g e d unt i l a l t e r e d by t he R em a in in g CapacityAlarm() function. The low-capacity value may
be expressed in either current (mA) or power (10mWh)
depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.
Input/Output:
Unsigned integer—the point below which remaining time messages are sent.
Units: minutes
Range: 0 to 65,535 minutes
Granularity: Not applicable
Accuracy: see AverageTimeToEmpty()
BatteryMode() (0x03); [0x03]
Description:
This function selects the various battery operational
modes and reports the battery’s mode and requests.
Purpose:
The RemainingCapacityAlarm() function can be used by
systems that know how much power they require to save
their operating state. It enables those systems to more
finely control the point at which they transition into suspend or hibernate state. The low-capacity value can be
read to verify the value in use by the bq2060’s low capacity alarm.
Defined modes include
n
n
SMBus Protocol: Read or Write Word
17
Whether the battery’s capacity information is
specified in mAh or 10mWh (CAPACITY_MODE bit)
Whether the ChargingCurrent() and ChargingVoltage()
values are broadcast to the Smart Battery Charger
bq2060
when the bq2060 detects the battery requires charging
(CHARGER_MODE bit)
n
least significant bit (bits 0–7) which is read only. The
bq2060 forces bits 0–6 to zero and prohibits writes to bit
7.
Whether all broadcasts to the Smart Battery Charger
and Host are disabled
Table 8 summarizes the meanings of the individual bits
in the BatteryMode() word and specifies the default values, where applicable, are noted.
The defined request condition is the battery requesting a
conditioning cycle (RELEARN_FLAG).
INTERNAL_CHARGE_CONTROLLER bit is not
used by the bq2060.
Purpose:
The CAPACITY_MODE bit allows power management
systems to best match their electrical characteristics
with those reported by the battery. For example, a
switching power supply represents a constant power
load, whereas a linear supply is better represented by a
constant current model. The CHARGER_MODE bit allows a SMBus Host or Smart Battery Charger to override the Smart Battery’s desired charging parameters by
d i sa b l i n g t he b q 2 0 6 0 ’s br o a d c as t s . T h e R ELEARN_FLAG bit allows the bq2060 to request a conditioning cycle.
PRIMARY_BATTERY_SUPPORT bit is not used by
the bq2060.
RELEARN_FLAG bit set indicates that the bq2060 is
requesting a capacity relearn cycle for the battery. The
bq2060 sets the RELEARN_FLAG on a full reset and if
it detects 20 cycle counts without an FCC update. The
bq2060 clears this flag after a learning cycle has been
completed.
CHARGE_CONTROLLER_ENABLED bit is not used
by the bq2060. The bq2060 forces this bit to zero.
SMBus Protocol: Read or Write Word
PRIMARY_BATTERY bit is not used by the bq2060.
The bq2060 forces this bit to zero.
Input/Output:
Unsigned integer —bit mapped— see below.
ALARM_MODE bit is set to disable the bq2060’s ability
to master the SMBus and send AlarmWarning() messages
to the SMBus Host and the Smart Battery Charger. When
set, the bq2060 does NOT master the SMBus, and
AlarmWarning() messages are NOT sent to the SMBus
Host and the Smart Battery Charger for a period of no
more than 65s and no less than 45s. When cleared
(default), the Smart Battery sends the AlarmWarning()
Units: not applicable
Range: 0–1
Granularity: not applicable
Accuracy: not applicable
The BatteryMode() word is divided into two halves, the
most significant bit (bits 8–15) which is read/write and the
Table 8. Battery Mode Bits and Values
Battery Mode() Bits
INTERNAL_CHARGE_CONTROLLER
PRIMARY_BATTERY_SUPPORT
Reserved
Bits Used
0
1
2–6
Format
Read only bit flag
Read only bit flag
RELEARN_FLAG
7
Read only bit flag
CHARGE_CONTROLLER_ENABLED
PRIMARY_BATTERY
Reserved
8
9
10–12
R/W bit flag
R/W bit flag
ALARM_MODE
13
R/W bit flag
CHARGER_MODE
14
R/W bit flag
CAPACITY_MODE
15
R/W bit flag
18
Allowable Values
0—Battery OK
1—Relearn cycle requested
0—Enable alarm broadcast (default)
1—Disable alarm broadcast
0—Enable charging broadcast (default)
1—Disable charging broadcast
0—Report in mA or mAh (default)
1—Report in 10mW or 10mWh
bq2060
messages to the SMBus Host and the Smart Battery
Charger any time an alarm condition is detected.
n
n
n
The bq2060 polls the ALARM_MODE bit at least
every 150ms. Whenever the ALARM_MODE bit is
set, the bq2060 resets the bit and starts or restarts a
55s (nominal) timer. After the timer expires, the
bq2060 automatically enables alarm broadcasts to
ensure that the accidental deactivation of broadcasts
does not persist. To prevent the bq2060 from
becoming a master on the SMBus, an SMBus host
must therefore continually set this bit at least once
per 50s to keep the bq2060 from broadcasting alarms.
The condition of the ALARM-MODE bit does NOT
affect the operation or state of the CHARGER_MODE
bit which is used to prevent broadcasts of
ChargingCurrent() and ChargingVoltage() to the
Smart Battery Charger.
n
RemainingCapacity()
n
FullChargeCapacity()
n
DesignCapacity()
AtRateTimeToFull()
n
RunTimeToEmpty()
n
AverageTimeToEmpty()
n
AverageTimeToFull()
n
Remaining Time Alarm()
n
BatteryStatus()
Purpose:
Since the AtRate() function is the first half of a
two-function call-set, it is followed by the second function of the call-set that calculates and returns a value
based on the AtRate value and the battery’s present
state. A delay of up to 1.3s is required after writing
AtRate() before the bq2060 can acknowledge the requested AtRate function.
n
Note 1: The following functions are changed to accept or
return values in mA/mAh or 10mW/10mWh depending
on the CAPACITY_MODE bit:
AtRate()
AtRateTimeToEmpty()
n
Description:
The AtRate() function is the first half of a two-function
call-set used to set the AtRate value used in calculations
made by the AtRateTimeToFull(), AtRateTimeToEmpty(), and AtRateOK() functions. The AtRate
value may be expressed in either current (mA) or power
(10mW) depending on the setting of the BatteryMode()’s
CAPACITY_MODE bit.
CAPACITY_MODE bit indicates if capacity information is reported in mA/mAh or 10mW/10mWh. When
set, the bq2060 reports capacity information in
10mW/10mWh as appropriate. When cleared, the
bq2060 reports capacity information in mA/mAh as appropriate. The CAPACITY_MODE bit defaults to a
cleared state within 130ms after the bq2060 detects the
SMBus Off-State.
n
n
AtRate() (0x04); [0x04]
CHARGER_MODE bit enables or disables the bq2060’s
t ra n smi s s i o n
of
C har g i ng C ur r e n t ( )
and
ChargingVoltage() messages to the Smart Battery
Charger. When set, the bq2060 does NOT transmit
ChargingCurrent() and ChargingVoltage() values to the
Smart Battery Charger. When cleared, the bq2060
transmits the ChargingCurrent() and ChargingVoltage()
v a l u e s t o t he S m a r t B a tte r y C ha r g er. T h e
CHARGER_MODE bit defaults to a cleared state within
130ms after the bq2060 detects the SMBus Off-State.
RemainingCapacityAlarm()
AtRateOK()
The bq2060 updates the non-AtRate related register values within 3s of changing the state of the CAPACITY_MODE bit. The AtRate() values will be updated after the next AtRate value is written to the bq2060 (or after the next 20s scheduled refresh calculation).
The ALARM_MODE bit defaults to a cleared state
within 130ms after the bq2060 detects the SMBus
Off-State.
n
n
n
n
When the AtRate() value is positive, the AtRateTimeToFull() function returns the predicted time to
full-charge at the AtRate value of charge.
When the AtRate() value is negative, the
AtRateTimeToEmpty() function returns the predicted
operating time at the AtRate value of discharge.
When the AtRate() value is negative, the AtRateOK()
function returns a Boolean value that predicts the
battery’s ability to supply the AtRate value of
additional discharge energy (current or power) for 10
seconds.
The default value for AtRate() is zero. Writing
AtRate() values over the HDQ16 serial port does NOT
trigger a re-calculation of AtRateTimeToFull(),
AtRateTimeToEmpty(), and AtRateOK() functions.
Note 2: The following functions are calculated on the
basis of capacity and may be calculated differently depending on the CAPACITY_MODE bit:
It is recommended that AtRate() requests should be limited to one request every 4s.
19
bq2060
SMBus Protocol: Read or Write Word
AtRateTimeToEmpty() (0x06); [0x06]
Input/Output: Signed integer—charge or discharge;
the AtRate() value is positive for charge, negative for
discharge, and zero for neither (default).
Description:
Returns the predicted remaining operating time if the
battery is discharged at the AtRate() value.
Units
Charge
Range
Discharge
Range
Granularity
Accuracy
Purpose:
The AtRateTimeToEmpty() function is part of a
two-function call-set used to determine the remaining
operating time at the AtRate()value. The bq2060 updates AtRateTimeToEmpty() within 1.3s after the
SMBus Host sets the AtRate() value. If read before this
delay, the command is No Acknowledged, and the error
code in BatteryStatus is set to not ready. The bq2060
automatically updates AtRateTimeToEmpty() based on
the AtRate() value every 20s.
Battery Mode
CAPACITY_MODE CAPACITY_MODE
bit = 0
bit = 1
mA
10mW
1–32,767mA
1–32,768 10mW
-1– -32,768mA
-1– -32,768 10mW
1 Unit
NA
SMBus Protocol: Read Word
Output:
AtRateTimeToFull() (0x05);[0x05]
Unsigned integer — estimated operating time left.
Description:
Returns the predicted remaining time to fully charge the
battery at the AtRate( ) value (mA).
Units: minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Purpose:
T h e A t Ra te Ti m e To F ul l ( ) f unc ti o n i s p a r t of a
two-function call-set used to determine the predicted
remaining charge time at the AtRate value in mA. The
bq2060 updates AtRateTimeToFull() within 1.3s after
the SMBus Host sets the AtRate value. If read before
this delay, the command is No Acknowledged and the error code in BatteryStatus is set to not ready. The
bq2060 automatically updates AtRateTimeToFull()
based on the AtRate() value every 20s.
Accuracy: -0, +MaxError() *
FullChargeCapacity/|AtRate()|
Invalid Data Indication: 65,535 indicates the battery is not being discharged.
AtRateOK() (0x07); [0x07]
Description:
Returns a Boolean value that indicates whether or not
the battery can deliver the AtRate( )value of additional
energy for 10 seconds (Boolean). If the AtRate value is
zero or positive, the AtRateOK() function ALWAYS return-true.
SMBus Protocol: Read Word
Output:
Unsigned integer—predicted time in minutes to
fully charge the battery.
Purpose:
The AtRateOK() function is part of a two-function
call-set used by power management systems to determine if the battery can safely supply enough energy for
an additional load. The bq2060 updates AtRateOK()
within 1.3s after the SMBus Host sets the AtRate( )
value. If read before this delay, the command is No Acknowledged, and the error code in BatteryStatus is set
to not ready. The bq2060 automatically updates
AtRateOK() based on the At Rate() value every 20s.
Units: minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Accuracy: ±MaxError() *
FullChargeCapacity()/|AtRate()|
SMBus Protocol: Read Word
Invalid Data Indication: 65,535 indicates the battery is not being charged.
Output:
Boolean—indicates if the battery can
supply the additional energy requested.
20
bq2060
Units: Boolean
Current() (0x0a); [0x0a]
Range: TRUE, FALSE
Description:
Returns the current being supplied (or accepted)
through the battery’s terminals (mA).
Granularity: not applicable
Accuracy: not applicable
Purpose:
The Current() function provides a snapshot for the
power management system of the current flowing into
or out of the battery. This information is of particular
use in power-management systems because they can
characterize individual devices and tune their operation
to actual system power behavior.
Temperature() (0x08); [0x08]
Description:
Returns the temperature (K) measured by the bq2060.
Purpose:
The Temperature() function provides accurate cell temperatures for use by battery chargers and thermal management systems. A battery charger can use the temperature as a safety check. Thermal management systems may use the temperature because the battery is
one of the largest thermal sources in a system.
SMBus Protocol: Read Word
Output:
Signed integer—charge/discharge rate in mA increments—positive for charge, negative for discharge.
SMBus Protocol: Read Word
Units: mA
Output:
Range: (± 250mV/RS) mA
Unsigned integer—cell temperature in tenth-degree
Kelvin increments.
Granularity: 0.038mV/RS (integer value)
Units: 0.1°K
Accuracy: ±1mV/RS (after calibration)
Range: 0 to +6553.5°K {real range}
AverageCurrent() (0x0b); [0x0b]
Granularity: 0.1°K
Description:
Returns a value that approximates a one-minute rolling
average of the current being supplied (or accepted)
t h r ou g h t h e b a t t er y ’s t er m in a ls ( m A ) .
The
AverageCurrent() function will return meaningful values during the battery’s first minute of operation.
Accuracy: ±1.5°K (from ideal 103AT thermistor
performance, after calibration)
Voltage() (0x09); [0x09]
Description:
Returns the cell-pack voltage (mV).
Purpose:
The AverageCurrent() function provides the average
current flowing into or out of the battery for the power
management system.
Purpose:
The Voltage() function provides power management systems with an accurate battery terminal voltage. Power
management systems can use this voltage, along with
battery current information, to characterize devices they
control. This ability helps enable intelligent, adaptive
power-management systems.
SMBus Protocol: Read Word
Output:
Signed integer—charge/discharge rate in mA increments—positive for charge, negative for discharge.
SMBus Protocol: Read Word
Units: mA
Output:
Range: (± 250mV/RS) mA
Unsigned integer—battery terminal
voltage in mV.
Granularity: 0.038mV/RS (integer value)
Units: mV
Accuracy: ±1mV/RS (after calibration)
Range: 0 to 20,000 mV
MaxError() (0x0c); [0x0c]
Granularity: 1mV
Description:
Returns the expected margin of error (%) in the state of
charge calculation. For example, when MaxError() re-
Accuracy: ±0.65% (after calibration)
21
bq2060
turns 10% and RelativeStateOfCharge() returns 50%,
the Relative StateOfCharge() is more likely between 50
and 60%. The bq2060 sets MaxError() to 100% on a full
reset. The bq2060 sets MaxError() to 2% on completion
of a learning cycle, unless the bq2060 limits the learning
cycle to the +512/-256mAh maximum adjustment values. If the learning cycle is limited, the bq2060 sets
MaxError() to 8% unless MaxError() was already below
8%. In this case MaxError() does not change. The
bq2060 increments MaxError() by 1% after four increments of CycleCount() without a learning cycle.
AbsoluteStateOfCharge()(0x0e); [0x0e]
Description:
Returns the predicted remaining battery capacity expressed as a percentage of DesignCapacity() (%). Note
that AbsoluteStateOfCharge() can return values greater
than 100%.
Purpose:
The AbsoluteStateOfCharge() function is used to estimate the amount of charge remaining in the battery relative to the nominal or DesignCapacity().
If voltage-based corrections are applied to the coulomb
counter, MaxError() is set to 25%.
SMBus Protocol: Read Word
Output:
Purpose:
The MaxError() function has real value in two ways:
first, to give the user a confidence level about the state
of charge and second, to give the power management
system information about how aggressive it should be,
particularly as the battery nears the end of its life.
Unsigned integer—percent of remaining capacity.
Units: %
Range: 0 to 100+%
SMBus Protocol: Read Word
Granularity: 1%
Output:
Accuracy: -0, +MaxError()
RemainingCapacity() (0x0f); [0x0f]
Unsigned integer—percent uncertainty for selected
information.
Description:
Returns the predicted charge or energy remaining in the
battery. The RemainingCapacity() value is expressed in
either charge (mAh at a C/5 discharge rate) or energy
(10mWh at a P/5 discharge rate) depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.
Units: %
Range: 2 to 100%
Granularity: 1%
Accuracy: not applicable
Purpose:
The RemainingCapacity() function returns the battery’s
remaining capacity. This information is a numeric indication of remaining charge or energy given by the Absolute
or Relative StateOfCharge() functions and may be in a
better form for use by power management systems.
RelativeStateOfCharge() (0x0d); [0x0d]
Description:
Returns the predicted remaining battery capacity expressed as a percentage of FullChargeCapacity() (%).
SMBus Protocol: Read Word
Purpose:
The RelativeStateOfCharge() function is used to estimate the amount of charge remaining in the battery relative to the last learned capacity.
Output:
Unsigned integer—remaining charge in mAh or
10mWh.
SMBus Protocol: Read Word
Output:
Battery Mode
CAPACITY_MODE CAPACITY_MODE
bit = 0
bit = 1
Units
mAh
10mWh
Range
0–65,535mAh
0–65,535 10mWh
Granularity
mAh
10mWh
Accuracy
-0, +MaxError() ∗ FullChargeCapacity()
Unsigned integer—percent of remaining capacity.
Units: %
Range: 0 to 100%
Granularity: 1%
Accuracy: -0, +MaxError()
22
bq2060
Accuracy: -0, +MaxError() ∗ FullChargeCapacity()
/ Current()
FullChargeCapacity() (0x10); [0x10]
Description:
Returns the predicted pack capacity when it is fully
charged. The FullChargeCapacity() value is expressed
in either current (mAh at a C/5 discharge rate) or power
(10mWh at a P/5 discharge rate) depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.
Invalid Data Indication: 65,535 indicates battery is
not being discharged.
AverageTimeToEmpty() (0x12); [0x12]
Description: Returns a one-minute rolling average of
the predicted remaining battery life (minutes). The
AverageTimeToEmpty() value is calculated based on either current or power depending on the setting of the
BatteryMode()’s CAPACITY_MODE bit.
Purpose:
The FullChargeCapacity() function provides the user
with a means of understanding the tank size of their
battery. This information, along with information about
the original capacity of the battery, can be presented to
the user as an indication of battery wear.
Purpose:
The AverageTimeToEmpty() displays state-of-charge information in a more useful way. It averages the instantaneous estimations so the remaining time does not appear to jump around.
SMBus Protocol: Read Word
Output:
SMBus Protocol: Read Word
Unsigned integer—estimated full-charge capacity
in mAh or 10mWh.
Output:
Unsigned integer — minutes of operation left.
Battery Mode
CAPACITY_MODE CAPACITY_MODE
bit = 0
bit = 1
Units
mAh
10mWh
Range
0–65,535mAh
0–65,535 10mWh
Granularity
mAh
10mWh
Accuracy
-0, +MaxError() ∗ FullChargeCapacity()
Units: minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Accuracy: -0, +MaxError() ∗ FullChargeCapacity()
/ AverageCurrent()
Invalid Data Indication: 65,535 indicates battery is
not being discharged.
RunTimeToEmpty() (0x11); [0x11]
AverageTimeToFull() (0x13); [0x13]
Description:
Returns the predicted remaining battery life at the present rate of discharge (minutes). The RunTimeToEmpty()
value is calculated based on either current or power depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.
Description: Returns a one-minute rolling average of
the predicted remaining time until the battery reaches
full charge (minutes).
Purpose: The AverageTimeToFull() function can be
used by the SMBus Host’s power management system to
aid in its policy. It may also be used to find out how long
the system must be left on to achieve full charge.
Purpose:
The RunTimeToEmpty() provides the power management
system with information about the relative gain or loss in
remaining battery life in response to a change in power
policy. This information is NOT the same as the
AverageTimeToEmpty(), which is not suitable to determine
the effects that result from a change in power policy.
SMBus Protocol: Read Word
Output:
Unsigned integer —remaining time in minutes.
SMBus Protocol: Read Word
Units: minutes
Output:
Range: 0 to 65,534 minutes
Unsigned integer—minutes of operation left.
Granularity: 2 minutes or better
Units: minutes
Accuracy: MaxError() ∗ FullChargeCapacity() /
AverageCurrent()
Range: 0 to 65,534 min
Invalid Data Indication: 65,535 indicates the battery is not being charged.
Granularity: 2 min or better
23
bq2060
ChargingCurrent() (0x14); [0x14]
Accuracy: not applicable
Description: Returns the desired charging rate in mA.
Invalid Data Indication: 65,535 indicates the
charger should operate as a current source outside
its maximum regulated voltage range.
Purpose: The ChargingCurrent() function sets the
ma x i mu m c har g e c ur r e nt o f the b a tt er y. T h e
ChargingCurrent() value should be used in combination
with the ChargingVoltage() value to set the charger’s operating point. Together, these functions permit the
bq2060 to dynamically control the charging profile (current/voltage) of the battery. The bq2060 can effectively
turn off a charger by returning a value of 0 for this function. The charger may be operated as a constant-voltage
source above its maximum regulated current range by
returning a ChargingCurrent() value of 65,535.
BatteryStatus()(0x16); [0x16]
Description: Returns the bq2060’s status word (flags).
Some of the BatteryStatus() flags (REMAINING_CAPACITY_ALARM and REMAINING_TIME_ALARM)
are calculated based on either current or power depending on the setting of the BatteryMode()’s CAPACITY_MODE bit. This is important because use of the
wrong calculation mode may result in an inaccurate
alarm.
SMBus Protocol: Read Word
Output:
Purpose: The BatteryStatus() function is used by the
power-management system to get alarm and status bits,
as well as error codes from the bq2060. This is basically
the same information broadcast to both the SMBus Host
and the Smart Battery Charger by the AlarmWarning()
function except that the AlarmWarning() function sets
the Error Code bits all high before sending the data.
Unsigned integer—maximum charger output current in mA.
Units: mA
Range: 0 to 65,535mA
Granularity: 1mA
Accuracy: not applicable
SMBus Protocol: Read Word
Invalid Data Indication: 65,535 indicates that a
charger should operate as a voltage source outside
its maximum regulated current range.
Output:
Unsigned integer—Status Register with alarm conditions bit mapped as follows:
ChargingVoltage() (0x15); [0x15]
Description: Returns the desired charging voltage in
mV.
0x8000
0x4000
0x2000
0x1000
0x0800
0x0400
0x0200
0x0100
Purpose: The ChargingVoltage() function sets the maxi mu m ch ar g e v o l ta g e o f t he b a tt er y. T h e
ChargingVoltage() value should be used in combination
with the ChargingCurrent() value to set the charger’s
operating point. Together, these functions permit the
bq2060 to dynamically control the charging profile (current/voltage) of the battery. The charger may be operated as a constant-current source above its maximum
re g u l a t e d v o l t a g e r a ng e by r e t u r n in g a
ChargingVoltage() value of 65,535.
0x0080
0x0040
0x0020
0x0010
SMBus Protocol: Write Word
0x0007
0x0006
0x0005
0x0004
0x0003
0x0002
0x0001
0x0000
Output:
Unsigned integer—charger output voltage in mV.
Units: mV
Range: 0 to 65,535mV
Granularity: 1mV
24
Alarm Bits
OVER_CHARGED_ALARM
TERMINATE_CHARGE_ALARM
reserved
OVER_TEMP_ALARM
TERMINATE_DISCHARGE_ALARM
reserved
REMAINING_CAPACITY_ALARM
REMAINING_TIME_ALARM
Status Bits
INITIALIZED
DISCHARGING
FULLY_CHARGED
FULLY_DISCHARGED
Error Codes
Unknown Error
BadSize
Overflow/Underflow
AccessDenied
UnsupportedCommand
ReservedCommand
Busy
OK
bq2060
Alarm Bits
FULLY_CHARGED bit is set when the bq2060 detects
a primary charge termination or an overcharged condition. It is cleared when RelativeStateOfCharge() is less
than or equal to the programmed Fully Charged Clear %
in EE 0x4c.
OVER_CHARGED_ALARM bit is set whenever the
bq2060 detects that the battery is being charged beyond
the Maximum Overcharge limit. This bit is cleared
when the bq2060 detects that the battery is no longer
being charged (i.e., the bq2060 detects discharge activity
or no activity for the digital filter timeout periods. The
digital filter timeout period (seconds) equates to 10 time
the value shared in Digital Filter EE0x52.)
FULLY_DISCHARGED bit is set when Voltage() is less
than the EDV2 threshold. This bit is cleared when the
Relative StateOfCharge() is greater than or equal to 20%.
Error Codes
Description
The bq2060 processed the function
OK
code without detecting any errors.
The bq2060 is unable to process the
Busy
function code at this time.
The bq2060 detected an attempt to
read or write to a function code
reserved by this version of the
Reserved
specification. The 2060 detected an
attempt to access an unsupported
optional manufacturer function code.
The bq2060 does not support this
Unsupported function code which is defined in this
version of the specification.
The bq2060 detected an attempt to
AccessDenied
write to a read-only function code.
The bq2060 detected a data overflow
Over/Underflow
or underflow.
The bq2060 detected an attempt to
BadSize
write to a function code with an
incorrect data block.
The bq2060 detected an
UnknownError
unidentifiable error.
TERMINATE_CHARGE_ALARM bit is set when the
bq2060 detects that one or more of the battery’s charging parameters are out of range (e.g., its voltage, current, or temperature is too high) or when the bq2060 detects a primary charge termination. This bit is cleared
when the parameter falls back into the allowable range,
the termination condition ceases, or when the bq2060
detects that the battery is no longer being charged.
OVER_TEMP_ALARM bit is set when the bq2060 detects that the internal battery temperature is greater
than or equal to the MaxT limit. This bit is cleared
when the internal temperature falls back into the acceptable range.
TERMINATE_DISCHARGE_ALARM bit is set when
the bq2060 detects that Voltage() is less than EDV0 or
when the CVUV bit in Pack Status is set indicating that
a Li-Ion cell voltage has dropped below the limit programmed in Cell Under / Over Voltage. The bit is
cleared when Voltage() is greater than EDV0 or when
the CVUV bit is cleared.
REMAINING_CAPACITY_ALARM bit is set when the
bq2060 detects that RemainingCapacity() is less than
that set by the RemainingCapacityAlarm() function.
This bit is cleared when either the value set by the
RemainingCapacityAlarm() function is lower than the
RemainingCapacity() or when the RemainingCapacity()
is increased by charging.
CycleCount()(0x17); [0x17]
Description: Returns the number of cycles the battery
has experienced. The mAh value of each count is determined by programming the Cycle Count Threshold value
in EE 0x3c–0x3d. The bq2060 saves the cycle count
value to Cycle Count EE 0x0e–0x0f after an update to
CycleCount().
REMAINING_TIME_ALARM bit is set when the
bq2060 detects that the estimated remaining time at the
present discharge rate is less than that set by the
RemainingTimeAlarm() function. This bit is cleared when
either the value set by the RemainingTimeAlarm() function is lower than the AverageTimeToEmpty() or when the
AverageTimeToEmpty() is increased by charging.
Purpose: The CycleCount() function provides a means
to determine the battery’s wear. It may be used to give
advanced warning that the battery is nearing its end of
life.
Status Bits
INITIALIZED bit is set when the bq2060 is has detected a valid load of EEPROM. It is cleared when the
bq2060 detects an improper EEPROM load.
SMBus Protocol: Read Word
Output:
Unsigned integer—count of total charge removed
from the battery over its life.
DISCHARGING bit is set when the bq2060 determines
that the battery is not being charged. This bit is cleared
when the bq2060 detects that the battery is being
charged.
Units: cycle
Range: 0 to 65,534 cycles 65,535 indicates battery
has experienced 65,535 or more cycles.
25
bq2060
Granularity: 1 cycle
SpecificationInfo() (0x1a); [0x1a]
Accuracy: absolute count
Description: Returns the version number of the Smart
Battery specification the battery pack supports, as well
as voltage and current scaling information in a packed
unsigned integer. Power scaling is the product of the
voltage scaling times the current scaling. The
SpecificationInfo is packed in the following fashion:
(SpecID_H ∗ 0x10 + SpecID_L) + (VScale + IPScale∗
0x10) ∗ 0x100.
DesignCapacity() (0x18); [0x18]
Description: Returns the theoretical or nominal capacity of a new pack. The DesignCapacity() value is expressed in either current (mAh at a C/5 discharge rate)
or power, (10mWh at a P/5 discharge rate) depending on
the setting of the BatteryMode()’s CAPACITY_MODE
bit.
The bq2060 VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The bq2060
sets SpecificationInfo() to the value programmed in
Specification Information EE 0x14–0x15.
Purpose: The DesignCapacity() function is used by the
SMBus Host’s power management in conjunction with
FullChargeCapacity() to determine battery wear. The
power management system may present this information to the user and also adjust its power policy as a result.
Purpose: The SpecificationInfo() function is used by
the SMBus Host’s power management system to determine what information the Smart Battery can provide.
SMBus Protocol: Read Word
SMBus Protocol: Read Word
Output:
Output:
Unsigned integer—battery capacity in mAh or
10mWh.
Unsigned integer—packed specification number
and scaling information.
Battery Mode
CAPACITY_MODE CAPACITY_MODE
bit = 0
bit = 1
Units
mAh
10mWh
Range
0–65,535mAh
0–65,535 10mWh
Granularity
Not applicable
Accuracy
Not applicable
Field
Bits
Used
Format
Allowable Values
4-bit binary
0–15
SpecID_L
0...3
value
4-bit binary
0–15
SpecID_H 4...7
value
4-bit binary 0 (multiplies voltage
VScale
8...11
value
by 10^ VScale)
4-bit binary 0 (multiplies current
IPScale 12...15
value
by 10 ^ IPScale)
DesignVoltage() (0x19); [0x19]
Description: Returns the theoretical voltage of a new
pack (mV). The bq2060 sets DesignVoltage() to the value
programmed in Design Voltage EE0x12–0x13.
ManufactureDate() (0x1b); [0x1b]
Description: This function returns the date the cell
pack was manufactured in a packed integer. The date is
packed in the following fashion: (year-1980) ∗ 512 +
month ∗ 32 + day. The bq2060 sets ManufactureDate()
to the value programmed in Manufacture Date EE
0x16–0x17.
Purpose: The DesignVoltage() function can be used to
give additional information about a particular Smart
Battery’s expected terminal voltage.
SMBus Protocol: Read Word
Output:
Units: mV
Purpose: The ManufactureDate() provides the system
with information that can be used to uniquely identify a
particular battery pack when used in conjunction with
SerialNumber().
Range: 0 to 65,535 mV
SMBus Protocol: Read Word
Granularity: not applicable
Output:
Unsigned integer—the battery’s designed terminal
voltage in mV
Accuracy: not applicable
Unsigned integer—packed date of manufacture.
26
bq2060
Field
Bits Used
Day
0...4
Month
5...8
Year
9...15
Format
5-bit binary
value
4-bit binary
value
7-bit binary
value
Purpose: The DeviceName() function returns the battery’s name for identification purposes.
Allowable Values
0–31 (corresponds to
date)
1–12 (corresponds to
month number)
0–127 (corresponds to
year biased by 1980)
SMBus Protocol: Read Block
Output:
String—character string with maximum length of 7
characters (7+length byte).
DeviceChemistry() (0x22); [0x30-0x32]
SerialNumber() (0x1c); [0x1c]
Description: This function returns a character string
that contains the battery’s chemistry. For example, if
the DeviceChemistry() function returns NiMH, the battery pack would contain nickel metal hydride cells. The
bq2060 sets DeviceChemistry() to the value programmed in Device Chemistry EE 0x40–0x44.
Description: This function is used to return a serial
number. This number, when combined with the
ManufacturerName(), the DeviceName(), and the
ManufactureDate(), uniquely identifies the battery (unsigned int). The bq2060 sets SerialNumber() to the
value programmed in Serial Number EE 0x18–0x19.
Purpose: The DeviceChemistry() function gives cell
chemistry information for use by charging systems. The
bq2060 does not use DeviceChemisty() values for internal charge control or fuel gauging.
Purpose: The SerialNumber() function can be used to
identify a particular battery. This may be important in
systems that are powered by multiple batteries where
the system can log information about each battery that
it encounters.
SMBus Protocol: Read Block
Output:
SMBus Protocol: Read Word
String—character string with maximum length of 4
characters (4+length byte).
Note: The following is a partial list of chemistries and
their expected abbreviations. These abbreviations are
NOT case sensitive.
Output:
Unsigned integer
ManufacturerName() (0x20); [0x20-0x25]
Description: This function returns a character array
containing the battery’s manufacturer’s name. For example, MyBattCo would identify the Smart Battery’s
ma n u fa ctur e r a s M y B at tC o . T he b q 2 0 6 0 s et s
ManufacturerName() to the value programmed in Manufacturer Name EE 0x20–0x2a.
Lead acid
Lithium ion
Nickel cadmium
Nickel metal hydride
Nickel zinc
Rechargeable alkaline-manganese
Zinc air
Purpose: The ManufacturerName() function returns
the name of the Smart Battery’s manufacturer. The
manufacturer’s name can be displayed by the SMBus
Host’s power management system display as both an
identifier and as an advertisement for the manufacturer.
The name is also useful as part of the information required to uniquely identify a battery.
PbAc
LION
NiCd
NiMH
NiZn
RAM
ZnAr
ManufacturerData() (0x23); [0x38–0x3a]
Description: This function allows access to the manufacturer data contained in the battery (data). The
bq2060 stores seven critical operating parameters in
this data area.
SMBus Protocol: Read Block
Output:
Purpose: The ManufacturerData() function may be
used to access the manufacturer’s data area. The data
fields of this command reflect the programming of five
critical EEPROM locations and can be used to facilitate
evaluation bq2060 under various programming sets.
The ManufacturerData() function returns the following
information in order: Control Mode, Digital Filter,
Self-Discharge Rate, Battery Low %, Near Full, and the
pending EDV threshold voltage (low byte and high
byte.)
String—character string with maximum length of
11 characters (11+length byte).
DeviceName() (0x21); [0x28-0x2b]
Description: This function returns a character string
that contains the battery’s name. For example, a
DeviceName() of BQ2060A would indicate that the batt e ry i s a m o d e l B Q 2060A . T he b q 2 0 6 0 s et s
DeviceName() to the value programmed in Device Name
EE 0x30–0x37.
SMBus Protocol: Read Block
27
bq2060
Output:
Block data—data that reflects EEPROM programming as assigned by the manufacturer with maximum length of 7 characters (7+length byte).
OCE
EDV2
b4
b3
b2
b1
EINT VDQ COK DOK CVOV
0
DFC pin is low
1
DFC pin is high
CVOV
The CVOV bit indicates that a secondary Li-Ion protection limit has been exceeded. It is set if any individual
cell exceeds the programmed high voltage limit, if the
pack voltage exceeds the overvoltage threshold, or if an
over temperature condition occurs. The bit is not latched
and merely reflects the present overvoltage status.
The Pack Status Register consists of the following bits:
b5
CFC pin is high
The DOK bit indicates the status of the DFC pin of the
bq2060.
This function returns the Pack Status and Pack Configuration registers. The Pack Status register contains a
number of status bits relating to bq2060 operation. The
Pack Status register is the least significant byte of the
word. The Pack Configuration register is the most significant byte of the word. The byte reflects how the
bq2060 is configured as defined by the value programmed in Pack Configuration in EE 0x3f.
b6
CFC pin is low
1
DOK
Pack Status and Pack Configuration (0x2f);
[0x2f]
b7
0
b0
CVUV
0
No secondary protection limits exceeded
1
A secondary protection limit exceeded
CVUV
The CVUV bit indicates if any individual cell falls below
the programmed low-voltage limit. The bit applies to
lithium batteries only. The bit is not latched and merely
reflects the present undervoltage status.
OCE
The OCE bit indicates that offset cancellation is enabled. The bq2060 sets this bit after VFC offset calibration is complete.
0
All series cells are above the low-voltage limit
0
Offset calibration is not enabled
1
A series cell is below the low voltage limit
1
Offset calibration is enabled
VCELL4–VCELL1 (0x3c–0x3f); [0x3c–0x3f]
EDV2
These functions return the calculated voltages in mV at
the VCELL4 through VCELL1 inputs.
The EDV2 bit indicates that Voltage() is less than the
EDV2 threshold.
0
Voltage() > EDV2 threshold (discharging)
EEPROM
1
Voltage() ≤ EDV2 threshold
General
EINT
VDQ
The bq2060 accesses the external EEPROM during a
full reset and when storing historical data. During an
EEPROM access, the VOUT pin becomes active and the
bq2060 uses the ESCL and ESDA pins to communicate
with the EEPROM. The EEPROM stores basic configuration information for use by the bq2060. The EEPROM
must be programmed correctly for proper bq2060 operation.
The VDQ bit indicates if the present discharge cycle is
valid for an FCC update.
Memory Map
The EINT bit indicates that the VFC has detected a
charge or discharge pulse.
0
No charge/discharge activity detected
1
Charge/discharge activity detected.
0
Discharge cycle is not valid
1
Discharge cycle is valid
Table 10 shows the memory map for the EEPROM. It
also contains example data for a 10 series NiMH and a
3s3p Li-Ion battery pack with a 0.05Ω sense resistor.
COK
The COK bit indicates the status of the CFC pin of the
bq2060.
28
bq2060
Table 10. EEPROM Memory Map
EEPROM
Address
0x00
0x02
0x04
0x06
0x07
0x08
0x0a
0x0c
0x0e
0x10
0x12
0x14
0x16
0x18
0x1a
0x1c
0x1e
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2a
0x2b
0x2c
0x2e
0x30
0x31
0x32
0x33
0x34
Name
Check Byte 1
0x01
Remaining Time Alarm
0x03
0x05 Remaining Capacity Alarm
EDV A0 Impedance Age
Factor
Reserved
0x09
Reserved
Charging Voltage
0x0b
0x0d
Reserved
Cycle Count
0x0f
0x11
Reserved
Design Voltage
0x13
Specification Information
0x15
Manufacture Date
0x17
Serial Number
0x19
Fast-Charging Current
0x1b
Maintenance Charging
0x1d
Current
Pre-Charge Current
0x1f
Manufacturer Name Length
Character 1
Character 2
Character 3
Character 4
Character 5
Character 6
Character 7
Character 8
Character 9
Character 10
Light Discharge Current
0x2d
Reserved
Maximum Overcharge
0x2f
Device Name Length
Character 1
Character 2
Character 3
Character 4
Chemistry
NiMH
Example
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
15487
10 minutes
350mAh
Li-Ion, Nickel
0
Data
MSB LSB
3c
7f
00
0a
01
5e
Li-Ion
Example
15487
10 minutes
400mAh
Data
MSB LSB
3c
7f
00
0a
01
90
-
00
0
-
00
0
0
Li-Ion, Nickel 18000mV
128
Li-Ion, Nickel
0
0
Li-Ion, Nickel 12000mV
Li-Ion, Nickel v1.1/PEC
Li-Ion, Nickel 2/25/99=9817
Li-Ion, Nickel
1
Li-Ion, Nickel
4000mA
00
46
00
00
00
2e
00
26
00
0f
00
00
50
80
00
00
e0
31
59
01
a0
0
0
12600mV
128
0
0
10800mV
v1.1/PEC
2/25/99=9817
1
3000mA
00
31
00
00
00
2a
00
26
00
0b
00
00
38
80
00
00
30
31
59
01
b8
Li-Ion, Nickel
200mA
00
c8
0mA
00
00
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
800mA
9
B
E
N
C
H
M
A
R
Q
0
0
0
200mAh
7
B
Q
2
0
03
00
ff
-
20
09
42
45
4e
43
48
4d
41
52
51
00
00
00
38
07
42
51
32
30
100mA
9
B
E
N
C
H
M
A
R
Q
0
0
0
256mAh
7
B
Q
2
0
00
00
ff
-
64
09
42
45
4e
43
48
4d
41
52
51
00
00
00
00
07
42
51
32
30
(Continued on next page)
Note:
Reserved locations must be set as shown. Locations marked with an * are calibration values that can be
adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial
setting.
29
bq2060
Table 10. EEPROM Memory Map (Continued)
EEPROM
Address
0x35
0x36
0x37
0x38
0x3a
0x3c
0x3e
0x3f
0x40
0x41
0x42
0x43
0x44
0x45
0x46
0x48
0x49
0x39
0x3b
0x3d
0x47
0x4a
0x4b
0x4c
0x4d
0x4e
0x4f
0x50
0x51
0x52
0x53
0x54
0x55
0x56 0x57
0x58 0x59
0x5a 0x5b
Name
Chemistry
NiMH
Example
Character 5
Character 6
Character 7
Last Measured Discharge
Pack Capacity
Cycle Count Threshold
Reserved
Pack Configuration
Device Chemistry Length
Character 1
Character 2
Character 3
Character 4
MaxT DeltaT
Overload Current
Overvoltage Margin
Overcurrent Margin
Reserved
Cell Under/Over Voltage
Fast Charge Termination %
Fully Charged Clear %
Charge Efficiency
Current Taper Threshold
DeltaT Time
Holdoff Time
Current Taper Qual Voltage
Manufacturers Data Length
Control Mode
Digital Filter
Self-Discharge Rate
Battery Low %
Near Full
Reserved
Reserved
Reserved
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Nickel
Li-Ion
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion
Nickel
Nickel
Li-Ion
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
-
6
0
A
4000mAh
4000mAh
500mAh
0
232
4
N
I
M
H
50C, 3.0
6000mA
0
512mA
0
96%
90%
97%
180s
240s
7
4
50µV
1%
7%
200mAh
0
0
0
Data
MSB LSB
36
30
41
0f
a0
0f
a0
fe
0c
00
e8
04
4e
49
4d
48
c7
17
70
00
20
00
a0
a6
el
07
04
07
04
2d
cb
12
64
00
00
00
Li-Ion
Example
6
0
A
4050mAh
4050mAh
3240mAh
0
246
4
L
I
O
N
50C, 4.6
6000mA
800mV
512mA
118
100%
95%
100%
200mA
128mV
7
4
50µV
0.21%
7%
200mAh
0
0
0
Data
MSB LSB
36
30
41
0f
d2
0f
d2
f3
58
00
f6
04
4c
49
4f
4e
cf
17
70
32
20
76
9c
a1
ff
12
40
07
04
2d
05
12
64
00
00
00
(Continued on next page)
Note:
Reserved locations must be set as shown. Locations marked with an * are calibration values that can be
adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial
setting.
30
bq2060
Table 10. EEPROM Memory Map (Continued)
EEPROM
Address
0x5c
0x5e
0x60
0x61
0x62
0x5d
0x5f
Description
Chemistry
NiMH
Example
Data
MSB LSB
00
00
00
00
00
00
00
-
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion
0
0
0
0
0
-
Nickel
0.25%
-
20
-
-
-
Li-Ion
-
-
-
0
-
00
Nickel
96%
-
a0
-
-
-
Li-Ion
Nickel
Li-Ion, Nickel
Li-Ion, Nickel
1%
16 : 1
50
20
d4
0
16 : 1
4e
30
00
20
d4
20
d6
d6
d4
28
2d
11
00
ca
02
40
19
1e
7b
00
eb
14
00
a5
e6
fa
5a
0x66
0x68
0x67
0x69
Reserved
VFC Offset*
VFC Offset*
Temperature Offset*
ADC Offset*
Cell 2 Calibration Factor*
Efficiency Temperature
Compensation
Cell 3 Calibration Factor*
Efficiency Drop Off
Percentage
Cell 4 Calibration Factor*
Efficiency Reduction Rate
ADC Voltage Gain*
ADC Sense Resistor Gain*
0.05Ω
4e
30
0x6a
0x6c
0x6e
0x70
0x72
0x74
0x76
0x6b
0x6d
0x6f
0x71
0x73
0x75
0x77
VFC Sense Resistor Gain*
VOC 25%
VOC 50%
VOC 75%
EDVF/EDV0
EMF/ EDV1
EDV T0 Factor
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
0.05Ω
11500mV
12500mV
13500mV
9500mV
10000mV
0
20
d3
cf
cb
25
27
00
00
14
2c
44
1c
10
00
0x78
0x79
EDV C1/C0 Factor/EDV2
Li-Ion, Nickel
10500mV
29
04
0x7a
0x7c
0x7e
0x7b
0x7d
0x7f
EDV R0 Factor
EDV R1 Factor
Check Byte 2
Li-Ion, Nickel
Li-Ion, Nickel
Li-Ion, Nickel
0
0
42330
00
a5
00
00
5a
0x63
0x64
0x65
Note:
Li-Ion
Example
0
0
0
0
0
0
0.05Ω
0.05Ω
10550mV
10750mV
11200mV
10265mV
11550
4475
C1 = 0
C0 = 235
5350
250
42330
Data
MSB LSB
00
00
00
00
00
00
00
00
Reserved locations must be set as shown. Locations marked with an * are calibration values that can be adjusted
for maximum accuracy. For these locations the table shows the appropriate default or initial setting.
31
bq2060
EEPROM Programming
learning cycle. The bq2060 uses the Last Measured Discharge value to calculate FullChargeCapacity() in mAh
or 10mWh mode.
The following sections describes the function of each
EEPROM location and how the data is to be stored.
EDV Thresholds and Near Full Percentage
Fundamental Parameters
The bq2060 uses three pack voltage thresholds to provide voltage-based warnings of low battery capacity.
The bq2060 uses the values stored in EEPROM for the
EDV0, EDV1, and EDV2 values or calculates the three
thresholds from a base value and the temperature, capacity, and rate adjustment factors stored in EEPROM.
If EDV compensation is disabled then EDV0, EDV1, and
EDV2 are stored directly in mV in EE 0x72–0x73, EE
0x74–0x75, and EE 0x78–0x79, respectively.
Sense Resistor Value
Two factors are used to scale the current related measurements. The 16-bit ADC Sense Resistor Gain value
in EE 0x68–0x69 scales Current() to mA. Adjusting
ADC Sense Resistor Gain from its nominal value provides a method to calibrate the current readings for system errors and the sense resistor value (RS) . The nominal value is set by
625
ADC Sense Resistor Gain=
(Rs)
For capacity correction at EDV2, Battery Low % EE
0 x 5 4 c a n b e s et a t a d es ir ed s t a t e- of - c h a r g e ,
STATEOFCHARGE%, in the range of 5 to 20%. Typical
values for STATEOFCHARGE% are 7–12% representing
7 –12% capacity.
(4)
The 16-bit VFC Sense Resistor Gain in EE 0x6a–0x6b
scales each VFC interrupt to mAh. VFC Sense Resistor
Gain is based on the resistance of the series sense resistor. The following formula computes a nominal or starting value for VFC Sense Resistor Gain from the sense resistor value.
VFC Sense Resistor Gain=
409.6
(Rs)
Battery Low % = STATEOFCHARGE% ∗ 2.56
The bq2060 updates FCC if a qualified discharge occurs
from a near-full threshold to EDV2. The desired
near-full threshold window, NFW (mAh), is programmed
in Near Full in EE 0x55.
(5)
Near Full =
Sense resistor values are limited to the range of 0.00916
to 0.100Ω.
(8)
If EDV compensation is enabled, the bq2060 calculates
battery voltage to determine EDV0, EDV1, and EDV2
thresholds as a function of battery capacity, temperature, and discharge load. The general equation for
EDV0, EDV1, and EDV2 calculation is
The digital filter threshold, VDF (µV), is set by the value
stored in Digital Filter EE 0x52.
2250
VDF
NFW
2
EDV Discharge Rate and Temperature Compensation
Digital Filter
Digital Filter =
(7)
(6)
(9)
Cell Characteristics
EDV0,1,2 = EMF ∗ FBL - |ILOAD| ∗ R0 ∗ FTZ ∗ FCY
where
Battery Pack Capacity and Voltage
n
Pack capacity in mAh units is stored in Pack Capacity
EE 0x3a–0x3b. In mAh mode, the bq2060 copies Pack
Capacity to DesignCapacity(). In mWh mode, the bq2060
multiplies Pack Capacity by Design Voltage EE
0x12–0x13 to calculate DesignCapacity() scaled to
10mWh. Design Voltage is stored in mV.
n
EMF is a no-load battery voltage that is higher than
the highest EDV threshold that is computed. EMF is
programmed in mV in EMF/EDV1 EE 0x74–0x75.
ILOAD is the current discharge load.
FBL is the factor that adjusts the EDV voltage for battery capacity and temperature to match the no-load
characteristics of the battery.
The initial value for Last Measured Discharge in mAh is
stored in EE 0x38–0x39. Last Measured Discharge is
modified over the course of pack usage to reflect cell aging under the particular use conditions. The bq2060 updates Last Measured Discharge in mAh after a capacity
FBL = f ( C0, C + C1, T )
where
32
(10)
bq2060
n
C (0%, 3%, or Battery Low % for EDV0, EDV1, and
EDV2, respectively) and C0 are the capacity related
EDV adjustment factors. C0 is programmed in the
lower 11 bits of EDV C0 Factor/EDV2 EE 0x78–79.
The Residual Capacity Factor is stored in the upper 5
bits of EE 0x78–0x79.
FCY is the factor that adjusts for changing cell impedance as the battery pack is cycled.
where
FCY = f(A0, CycleCount())
n
Residual Capacity Factor C1 =RESIDUAL% * 2.56
RESIDUAL % is the desired battery capacity remaining
at EDV0 (RM = 0).
n
EMF = 11550
R0 ∗ FTZ represents the resistance of the battery as a
function of temperature and capacity.
n
n
C0 = 235
(11)
C1 = 0
R0 = 5350
R1 = 250
T is the current temperature; C is the battery
capacity relating to EDV0, EDV1, and EDV2; and C1
is the desired residual battery capacity remaining at
EDV0 (RM = 0).
A0 = 0
The graphs in Figures 7 and 8 show the calculated
EDV0, EDV1, and EDV2 thresholds versus capacity using the typical compensation values for different
temperatures and loads for a Li-Ion 3s3p 18650 pack.
The compensation values vary widely for different cell
types and manufacturers and must be matched exactly
to the unique characteristics for optimal performance.
R1 adjusts the variation of impedance with battery
capacity. R1 is programmed in EDV R1 Rate Factor
EE 0x7c–0x7d.
T0 adjusts the variation of impedance with battery
temperature. T0 is programmed in EDV T0 Rate
Factor EE 0x76–0x77.
Overload Current Threshold
The Overload Current threshold is a 16-bit value stored
in EE 0x46-0x47 in mA units.
Battery Low % =7%, Temperature = 35 C
Battery Low %= 7%, Load = 500mA
11500
11500
11000
11000
EDV2
10500
EDV2
10500
EDV1
EDV1
Voltage (mV)
n
T0 = 4475
R0 is the first order rate dependency factor stored in
EDV R0 Factor EE 0x7a–0x7b.
Voltage (mV)
n
A0 is the EDV aging factor that is stored in EDV A0
Factor EE 0x06. It should be set to 0 for most
applications.
Typical values for the EDV compensation factors for a
Li-Ion 3s3p 18650 pack are
T is the current temperature in °K
FTZ = f ( R1 , T0, T, C + C1)
(12)
10000
9500
9000
8500
10000
9500
9000
45C/500mA
8500
20C/500mA
8000
8000
35C/500mA
35C/1A
35C/2A
7500
EDV0
7500
7000
10
9
8
7
6
5
4
3
2
1
0
10
% Capacity
9
8
7
6
5
4
3
2
1
0
% Capacity
Figure 8. EDV Calculations vs. Capacity
for Various Loads
Figure 7. EDV Calculations vs. Capacity
for Various Temperatures
33
bq2060
Midrange Capacity Corrections
Efficiency Reduction Rate =
Three voltage-based thresholds, VOC25 EE 0x6c–0x6d,
VOC50 EE 0x6e–0x6f, and VOC75 EE 0x70–0x71, are
u se d t o t es t t he ac c ur a c y o f t he R M b a s ed on
open-circuit pack voltages. These thresholds are stored
in the EEPROM in 2’s complement of voltage in mV.
The values represent the open-circuit battery voltage at
which the battery capacity should correspond to the associated state of charge for each threshold.
Self-Discharge Rate
The nominal self-discharge rate, %PERDAY (% per day),
is programmed in an 8-bit value Self-Discharge Rate EE
0x53 by the following relation:
ERR%
0.0125
where
0 ≤ ERR% ≤ 3.19
The Efficiency Drop Off Percentage is stored in 2’s complement of percent.
The bq2060 also adjusts the efficiency factors for temperature. TEFF% defines the percent efficiency reduction per
degree C over 25°C. TEFF% is encoded in Efficiency Temperature Compensation EE 0x63 according to the following equation
(17)
Efficiency Temperature Compensation =
æ
52.73 ö
÷
Self - Discharge Rate = 256 -ç
è %PERDAY ø
(13)
TEFF% *1.6
0.0125
where
0 ≤ TEFF% ≤1.99
Light Load Current
The amount of light load current in mA, ILEAK, used
for compensation is stored in Light Discharge Current in
EE 0x2b as follows:
Light Discharge Current =
(16)
ILEAK * 1024
45
The bq2060 applies all four charge-compensation factors
when the CHEM bit in Pack Configuration is not set denoting a nickel pack.
(18)
(14)
Effective Charge Efficiency Reduction (nickel only)
= ERR%[RSOC() – EFF%] + TEFF%[T(°C) – 25]
ILEAK is between 0.044 and 11.2mA.
where
Charge Efficiency
The bq2060 uses four charge-efficiency factors to compensate for charge acceptance. These factors are coded
in Charge Efficiency, Efficiency Reduction Rate, Efficiency Drop Off Percentage, and Efficiency Temperature
Compensation.
The bq2060 applies the efficiency factor, EFF%, when
RelativeStateOfCharge() is less than the value coded in
Efficiency Drop Off Percentage EE 0x64. When
RelativeStateOfCharge() is greater than or equal to the
value coded in Efficiency Drop Off Percentage, EFF%
and ERR% determine the charge efficiency rate. ERR%
defines the percent efficiency reduction per percentage
point of RelativeStateOfCharge() over Efficiency Drop
Off Percentage. EFF% is encoded in High Charge
Efficiency EE 0x4d according to the following equation:
Charge Efficiency = 10 ∗ (EFF% - 74.5)
(15)
RSOC() ≥ EFF% and T ≥ 25°C
If CHEM is set denoting a Li-Ion pack, the bq2060 applies only the value coded in High Charge Efficiency and
makes no other adjustments for charge acceptance.
Charge Limits and Termination
Techniques
Charging Voltage
The 16-bit value, Charging Voltage EE 0x0a-0x0b programs the ChargingVoltage() value broadcast to a Smart
Charger. It is also sets the base value for determining
overvoltage conditions during charging and voltage compliance during a constant-voltage charging methodology.
It is stored in mV.
Overvoltage
where
74.5 ≤ EFF% ≤ 100
ERR% is encoded in Efficiency Reduction Rate EE 0x65
according to the following equation:
The 8-bit value, Overvoltage Margin EE 0x48, sets the
limit over ChargingVoltage() that is to be considered as
an overvoltage charge-suspension condition. The voltage
in mV above the ChargingVoltage(), VOVM, that should
34
bq2060
trigger a charge suspend is encoded in Overvoltage Margin as follows:
Overvoltage Margin=
VOVM
16
FULLY_CHARGED Bit Clear Threshold
(19)
The bq2060 clears the FULLY_CHARGED bit in
BatteryStatus() when RelativeStateOfCharge() reaches
the value, Fully Charged Clear % EE 0x4c. Fully
Charged Clear % is an 8-bit value and is stored as a 2’s
complement of percent.
VOVM is between 0 and 4080mV.
Charging Current
Fast Charge Termination Percentage
ChargingCurrent() values are either broadcast to a
Level 2 Smart Battery Charger or read from the bq2060
by a Level 3 Smart Battery Charger. The bq2060 sets
the value of ChargingCurrent(), depending on the
charge requirements and charge conditions of the pack.
The bq2060 sets RM to a percentage of FCC on charge
termination if the CSYNC bit is set in the Pack Configuration register. The percentage of FCC is stored in Fast
Charge Termination % in EE 0x4b. The value is stored
in 2’s complement of percent.
Wh e n fa s t c ha r g e i s a l l o w e d , the bq 2 0 6 0 s et s
ChargingCurrent() to the rate programmed in Fast
Charging Current EE 0x1a-0x1b.
Cycle Count Threshold
Cycle Count Threshold 0x3c–0x3d sets the number of
mAh that must be removed from the battery to increment CycleCount(). Cycle Count Threshold is a 16-bit
value stored in 2’s complement of charge in mAh.
Wh e n fa s t c har g e te r m i nat e s , t he b q 2 0 6 0 s et s
ChargingCurrent() to zero and then to the Maintenance
Charging Current EE 0x1c-0x1d when the termination
condition ceases.
∆T/Dt Rate Programming
When Voltage() is less than EDV0, the bq2060 sets
ChargingCurrent() to Pre-charge Current EE 0x1e-0x1f.
Typically this rate is larger than the maintenance rate
to charge a deeply depleted pack up to the point where it
may be fast charged.
The ∆T portion of the ∆T/∆t rate is programmed in
DeltaT, the low nibble of MaxT DeltaT EE 0x45 (least
significant nibble). The ∆t portion is programmed in
DeltaT Time EE 0x4e.
∆T/∆t =
Fast Charging Current, Maintenance Charging Current,
and Pre-Charge Current are stored in mA.
DeltaT
0
1
2
3
4
5
6
7
8
9
a
b
c
d
e
f
Charge Suspension
During charge, the bq2060 compares the current to the
ChargingCurrent() plus the value IOIM. If the pack is
charged at a current above the ChargingCurrent() plus
IOIM, the bq2060 sets ChargingCurrent() set to zero to
stop charging. IOIM is programmed in the EEPROM
value, Overcurrent Margin, encoded as
Overcurrent Margin=
IOIM
16
(20)
Overcurrent Margin EE 0x49 may be used to program
IOIM values of 0 to 4080mA in 16mA steps.
The desired temperature threshold for charge suspension, MAXTEMP, may be programmed between 45°C
and 69°C in 1.6°C steps. MaxT DeltaT EE 0x45 (most
significant nibble) is stored in a 4-bit value as shown:
é 69 - MAXTEMP ù
MaxT =ê
ú
ë
û
1.6
(21)
[DeltaT * 2 + 16] / 10 é ° Cù
ë sú
û
[320 - DeltaT Time* 20]ê
D(°C)
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
DeltaT_Time
00
01
02
03
04
05
06
07
08
09
0a
0b
0c
0d
0e
0f
(22)
t (s)
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
DT/Dt Hold-off Timer Programming
The bq2060 suspends fast charge when fast charge continues past full by the amount programmed in Maximum Overcharge EE 0x2e-0x2f. Maximum Overcharge
is programmed in 2s complement form of charge in mAh.
The hold-off timer is programmed in the lower nibble of
Holdoff Time EE 0x4f. The hold-off time is 320s minus
20 times the Holdoff Time value.
35
bq2060
Hold-off
Time
00
01
02
03
04
05
06
07
Hold-off
Time (s)
320
300
280
260
240
220
200
180
Hold-off
Time
08
09
0a
0b
0c
0d
0e
0f
Hold-off
Time (s)
160
140
120
100
80
60
40
20
1
CSYNC
In usual operation of the bq2060, the CSYNC bit is set
so that the coulomb counter is adjusted when a fast
charge termination is detected. In some applications, especially those where an externally controlled charger is
used, it may be desirable NOT to adjust the coulomb
counter. In these cases the CSYNC bit should be
cleared.
Current Taper Termination Characteristics
Two factors in the EEPROM set the current taper termination for Li-Ion battery packs. The two coded locations
are Current Taper Qual Voltage EE 0x4f and Current
Taper Threshold EE 0x4e. Current taper termination occurs during charging when the pack voltage is above the
charging voltage minus CELLV (mV) and the charging
current is below the threshold coded in Current Taper
Threshold for at least 40s.
Current Taper Qual Voltage =
Current Taper Threshold =
CELLV
2
(23)
RS* i
0.5625
(24)
SMBus read access is limited to commands
(0x05–0x1c) and (0x20–0x23). SMBus read/write
access is limited to commands (0x00–0x04), (0x2f),
and (0x3c–0x3f).
0
The bq2060 does not alter RM at the time of a valid
charge termination.
1
The bq2060 updates RM with a programmed percentage of FCC at a valid charge termination.
CEDV
The CEDV bit determines whether the bq2060 implements automatic EDV compensation to calculate the
EDV0, EDV1 and EDV2 thresholds base on rate, temperature, and capacity. If reset, the bq2060 uses the
fixed values programmed in EEPROM for EDV0, EDV1
and EDV2. If set the bq2060 calculates EDV0, EDV1
and EDV2.
where i = the desired current termination threshold in
mA, and RS = VFC sense resistor in ohms.
0
EDV compensation disabled
1
EDV compensation enabled
Pack Options
VCOR
Pack Configuration
The VCOR bit enables the midrange voltage correction
algorithm. When set, the bq2060 compares the pack
voltage to RM and may adjust RM according to the values programmed in VOC25, VOC50, and VOC75.
Pack Configuration EE 0x3f contains bit-programmable
features.
b7
b6
DMODE SEAL
b5
b4
b3
b2
b1
b0
CSYNC
CEDV
VCOR
CHEM
LCC1
LCC0
0
Midrange corrections disabled
1
Midrange corrections enabled
CHEM
DMODE
The CHEM bit configures the bq2060 for nickel packs
(NiCd or NiMH) or Li-Ion packs. When set the bq2060
employs the configuration parameters in EEPROM designated for Li-Ion. When not set, the bq2060 employs
the configuration parameters designated for nickel.
The DMODE bit determines whether the LED outputs
will
indicate
AbsoluteStateOfCharge()
or
RelativeStateOfCharge()
0
LEDs reflect AbsoluteStateOfCharge()
1
LEDs reflect RelativeStateOfCharge()
SEAL
The bq2060 uses nickel configuration parameters.
1
The bq2060 uses Li-Ion configuration parameters.
LCC0 and LCC1
The SEAL bit determines the SMBus access state of the
bq2060 on reset
0
0
The LCC0 and LCC1 bits configure the cell voltage inputs (VCELL1–4).
SMBus commands (0x00–0xff) are accessible for
both read and write.
36
bq2060
No. of Series
Cells
NA
2
3
4
Cell Voltage
LCC1 LCC0
Inputs
00
VCELL4 = Cell Stack
VCELL1 = Cell 1
01
VCELL2 = Cell 2
VCELL1 = Cell 1
10
VCELL2 = Cell 2
VCELL3 = Cell 3
VCELL1 = Cell 1
VCELL2 = Cell 2
11
VCELL3 = Cell 3
VCELL4 = Cell 4
a
b
c
d
e
f
2688
2752
2816
2880
2944
3008
a
b
c
d
e
f
4416
4448
4480
4512
4544
4576
Cycle Count Initialization
Cycle Count EE 0x0e–0x0f stores the initial value for
the CycleCount() function. It should be programmed to
0x0000.
For Li-Ion packs with individual measurements, LCC0
and LCC1 define the number of series elements and
their voltage measurement inputs. In each case (2, 3, or
4), the bq2060 uses the highest numbered cell voltage
input to measure the pack voltage measurement as returned with Voltage(). For nickel chemistries or Li-Ion
without single-cell measurements, LCC0 and LCC1
must be set to 00. VCELL4 is the pack voltage input for
this programming.
Control Modes
Control Mode EE0x51 contains additional bit programmable features.
b7
NDF
b6
-
b5
HPE
b4
CPE
b3
LED
b2
SC
b1
-
b0
SM
Remaining Time and Capacity Alarms
NDF
Remaining Time Alarm in EE 0x02–0x03 and Remaining Capacity Alarm in 0x04–0x05set the alarm
thresholds used in the SMBus command codes 0x01 and
0x02, respectively. Remaining Time Alarm is stored in
minutes and Remaining Capacity Alarm in mAh.
The NDF bit disables the digital filter during discharge
if the SMBC and SMBD lines are high.
Secondary Protection Limits for Li-Ion
HPE
The cell undervoltage (VUV) and overvoltage (VOV) limits
are programmed in Cell Undervoltage/Over Voltage EE
0x4a according to the equations:
The HPE bit enables/disables PEC transmissions to the
Smart Battery host for master mode alarm messages.
Cell Undervoltage/Overvoltage (lower) =
VOV - 4096
32
(25)
Cell Undervoltage/Overvoltage (upper) =
VUV - 2048
64
(26)
Cell Under/Over
Voltage
(upper nibble)
0
1
2
3
4
5
6
7
8
9
VUV
(mV)
2048
2112
2176
2240
2304
2368
2432
2496
2560
2624
Cell Under/Over
Voltage
(lower nibble)
0
1
2
3
4
5
6
7
8
9
0
Digital filter enabled all the time
1
Digital filter disabled if SMBC and SMBD are high
0
No PEC byte on alarm warning to host
1
PEC byte on alarm warning to host
CPE
The CPE bit enables/disables PEC transmissions to the
Smart Battery Charger for master mode alarm messages.
VOV
(mV)
4096
4128
4160
4192
4224
4256
4288
4320
4352
4384
0
No PEC byte on broadcasts to charger
1
PEC byte on broadcasts to charger
LED
The LED bit configures the bq2060 for 4 or 5 LED indication
37
0
Selects the 5 LED indication mode
1
Selects the 4 LED indication mode
bq2060
SC
(27)
The SC bit enables learning cycle optimization for a
Smart Charger or independent charge
0
Learning cycle optimized for independent charger
1
Learning cycle optimized for Smart Charger
é VCELL1*32768
ù é ADC Voltage Gain ù
Vn1=ê
+ ADC Offsetú*ê
ú
û
ë
ûë
65536
1250
(28)
é VCELL2*32768
ù
Vn2=ê
+ ADC Offsetú*
ë
û
1250
SM
é ADC Voltage Gain + 8* (Cell 2 CalibrationFactor) ù
ê
ú
ë
û
65536
The SM bit enables/disables master mode broadcasts by
the bq2060
0
Broadcasts to host and charger enabled
1
Broadcasts to host and charger disabled
(29)
é VCELL3*32768
ù
Vn3=ê
+ ADC Offsetú *
ë
û
1250
I f t h e S M bi t i s s e t , m o d i f i c a ti o ns t o b it s in
BatteryMode() will not re-enable broadcasts.
[ ADC Voltage Gain + 8* (Cell
3 CalibrationFactor) ]*
é
2 ù
ê
ë 65536ú
û
Measurement Calibration
(30)
ADC
é VCELL4*32768
ù
Vn4=ê
+ ADC Offsetú*
ë
û
1250
To describe how the bq2060 calculates reported battery
and individual cell voltages, the following abbreviations
and designations are used:
[ ADC Voltage Gain + 8* (Cell 4 CalibrationFactor)]*
VCELL 1–4 = voltages at the input pins of the
bq2060
é 2 ù
ê
ë 65536ú
û
VCELL1–4 = reported cell voltages
Note: With LCC1-LCC0 = 00, Cell 4 Calibration
Factor = 0.
Vnl–4 = voltages at the different series nodes in the
battery
ADC Offset adjusts the ADC reading for voltage and current measurements. ADC Offset is a signed 8-bit value
that cancels offset present in the circuit with no potential or current flow. ADC Offset is typically set between
-20 and 20.
Voltage() = reported battery voltage
Vsr = voltage across the sense resistor
The reported voltages measurements, Voltage() and
VCELL1–4, may be calibrated by adjusting five 8- or
16-bit registers in EEPROM: ADC Offset in EE0x62,
ADC Voltage Gain in EE 0x66–0x67, Cell 2 Calibration
Factor in EE 0x63, Cell 3 Calibration Factor in EE 0x64,
and Cell 4 Calibration Factor in EE 0x65.
The bq2060 uses the computed node voltages to calculate the reported voltages. It does not compute reported
cell voltages greater than the selected number of nodes.
If no individual cell voltages are to be measured,
LCC1–LCC0 should be set to 00 and the top of the battery stack should be connected to a voltage divider to
the VCELL4 input.
The bq2060 first computes the node voltages Vnl, Vn2,
Vn3, and Vn4. The node voltages are inputs to the voltage dividers to the VCELL1 through VCELL4 input pins
of the bq2060. The bq2060 computes node voltages to
calculate the five reported voltages by the bq2060: Voltage(), VCELL1, VCELL2, VCELL3, and VCELL4.
The bq2060 computes the reported voltages as follows:
Voltage() = Vn4 (LCC1–LCC0 = 11 or 00) - Vsr
Voltage() = Vn3 (LCC1–LCC0 = 10) - Vsr
An ADC Voltage Gain factor of 20,000 is the nominal
value when using the recommended cell-voltage division
ratios of 16:1 on the VCELL4 and VCELL3 inputs and
8:1 on the VCELL2 and VCELL1 inputs. The bq2060
subtracts the voltage across the sense resistor from the
measurements so that the reported voltages reflect the
cell-stack voltages only.
Voltage() = Vn2 (LCC1–LCC0 = 01) - Vsr
VCELL4 = Vn4 - Vn3
VCELL3 = Vn3 - Vn2
VCELL2 = Vn2 - Vn1
The bq2060 compute the node voltages as
38
bq2060
VCELL1 = Vn1 - Vsr
Constants and String Data
Current
EEPROM Constants
The bq2060 scales Current() to mA units by the 16-bit
value ADC Sense Resistor Gain in EE 0x68–0x69.
Adjusting ADC Sense Resistor Gain from its nominal
value provides a method to calibrate the current readings for variances in the ADC gain, internal voltage reference, and sense resistor value. The bq2060 calculates
Current() by
Check/Byte 1 EE 0x00–0x01 and Check Byte 2 EE
0x7e–0x7f must be programmed to 0x3c7f and 0xa55a,
respectively.
Specification Information
Specification Information EE 0x14–0x15 stores the default value for the SpecificationInfo() function. It is
stored in EEPROM in the same format as the data returned by the SepcificationInfo().
(31)
Current() =
[(ADC Reading + ADC Offset)* ADC Sense Resistor Gain] Manufacture Date
16,384
Manufacture Date EE 0x16–0x17 stores the default
value for the ManufactureDate() function. It is stored in
EEPROM in the same format as the data returned by
the ManufactureDate().
The nominal value for ADC Sense Resistor Gain is given
by equation (6).
Serial Number
Serial Number EE 0x18–0x19 stores the default value
for the SerialNumber() function. It is stored in
EEPROM in the same format as the data returned by
the SerialNumber().
VFC
To calibrate the coulomb counting measurement for VFC
gain errors and sense resistor tolerance, the value of
VFC Sense Resistor Gain EE 0x6a-0x6b may be adjusted
from its nominal value.
Manufacturer Name Data
The nominal value of VFC Sense Resistor Gain is given
by equation (5).
Manufacturer Name Length EE 0x20 stores the length
of t h e d es ir ed s t r in g t h a t is r et u r n ed b y t h e
ManufacturerName() function. Locations EE 0x21–0x2a
store the characters for ManufacturerName() in ASCII
code.
The bq2060 VFC circuit can introduce a signal opposite
in sign from that of the inherent device and circuit offset
to cancel this error. The offset calibration routine is initiated with commands to ManufacturerAccess().
Device Name Data
The bq2060 calculates the offset with the calibration
routine and stores the calibration value using the least
21 bits of VFC Offset in EE 0x5e–0x60.
Device Name Length EE 0x30 stores the length of the
desired string that is returned by the DeviceName()
function. Locations EE 0x31–0x37 store the characters
for DeviceName() in ASCII code.
The least 20 bits store the offset calibration value
(OCV). The sign of the offset calibration value is positive
if the 21st bit is 0.
OCV =
0.6V
VFCuOffset19 – 0
Device Chemistry Data
(32)
Device Chemistry Length EE 0x40 stores the length of
t h e d es ir ed s t r in g t h a t is r et u r n ed b y t h e
DeviceChemistry() function. Locations EE 0x41–0x44
store the characters for DeviceChemistry() in ASCII
code.
Temperature
The bq2060 uses Temperature Offset in EE 0x61 to calibrate the Temperature() function for offset. The required
offset adjustment, TOFF (C), sets Temperature Offset according to the equation
Temperature Offset = TOFF * 10
Manufacturers Data Length
Manufacturers Data Length EE 0x50 stores the length
of the desired number of bytes that is returned by the
ManufacturersData() function. It should be set to 7.
(33)
where
-12.8 ≤ TOFF ≤12.7
39
bq2060
Absolute Maximum Ratings
Symbol
Parameter
Minimum
Maximum
Unit
VCC—Supply voltage
Relative to VSS
-0.3
+6.0
V
VIN–All other pins
Relative to VSS
-0.3
+6.0
V
TOPR
Operating
temperature
-20
+70
°C
Notes
Commercial
Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation
should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to
DC Electrical Characteristics (VCC = 2.7–3.7V, TOPR = -20–70°C, Unless Otherwise Noted)
Symbol
Parameter
Conditions
Minimum Typical
VCC
Supply voltage
ICC
Operating current
VOUT inactive
ISLP
Low-power storage mode current
1.5V < VCC < 3.7V
ILVOUT
VOUT leakage current
VOUT inactive
-0.2
IVOUT
VOUT source current
VOUT active,
VOUT = VCC - 0.6V
-5.0
VOLS
Output voltage low: LED1–LED5, CFC,
DFC
IOLS = 5mA
Output voltage low: THON, CVON
IOLS = 5mA
2.7
Maximum
Unit
3.3
3.7
V
180
235
µA
10
µA
0.2
µA
5
mA
0.4
V
0.36
V
Input voltage low DISP
-0.3
0.8
V
VIH
Input voltage high DISP
2.0
VCC + 0.3
V
VOL
Output voltage low SMBC, SMBD,
HDQ16, ESCL, ESDA
0.4
V
VILS
Input voltage low SMBC, SMBD,
HDQ16, ESCL, ESDA
-0.3
0.8
V
VIHS
Input voltage high SMBC, SMBD,
HDQ16, ESCL, ESDA
1.7
6.0
V
VAI
Input voltage range VCELL1–4, TS,
SRC
VSS - 0.3
1.25
V
IRB
RBI data-retention input current
50
nA
VRBI
RBI data-retention voltage
VIL
IOL = 1.0mA
VRBI > 3.0V, VCC < 2.0V
10
1.3
V
ZAI1
Input impedance: SR1, SR2
0–1.25V
10
MΩ
ZAI2
Input impedance: VCELL1–4, TS, SRC
0–1.25V
5
MΩ
40
bq2060
VFC Characteristics (VCC = 3.1–3.6V, TOPR = 0–70°C Unless Otherwise Noted))
Symbol
Parameter
Conditions
VSR
Input voltage range, VSR2
and VSR1
Minimum Typical Maximum
VSR = VSR2 – VSR1
–0.25
VSROS
VSR input offset
VSR2 = VSR1, autocorrection
disabled
–250
VSRCOS
Calibrated offset
RMVCO
Supply voltage gain
coefficient (see Note)
RMTCO
Temperature gain
coefficient (see note)
–50
–16
VCC = 3.3V
0.8
Unit
+0.25
V
250
µV
+16
µV
1.2
%/V
%/°C
Slope for TOPR = –20 to 70°C
–0.09
+0.09
Total Deviation TOPR = –20 to 70°C
–1.6
0.1
%
Slope for TOPR = –0 to 50°C
–0.05
+0.05
%/°C
Total Deviation TOPR = –0 to 50°C
–0.6
0.1
%
0.21
%
Maximum
Unit
3.6
V
Integral nonlinearity
TOPR = 0–50C
INL
error
Note: RMTCO total deviation is from the nominal gain at 25°C.
REG Characteristics (TOPR = -20–70°C)
Symbol
Parameter
VRO
REG controlled output voltage
IREG
REG output current
Conditions
JFET: Rds(on) < 150Ω
Vgs (off) < –3.0V @ 10µA
Minimum Typical
3.1
1.0
41
3.3
µA
SMBus AC Specifications (VCC = 2.7–3.7V, TOPR = -20–70°C, Unless Otherwise Noted)
Symbol
Parameter
Conditions
Min.
FSMB
SMBus operating frequency
Slave mode, SMBC 50% duty cycle
10
SMBus master clock frequency
Master mode, no clock low slave
extend
FMAS
THD:STA
TSU:STA
TSU:STO
Bus free time between start and
stop
Hold time after (repeated) start
Repeated start setup time
Stop setup time
THD:DAT
Data hold time
TSU:DAT
TTIMEOUT
TLOW
THIGH
Data setup time
Error signal/detect
Clock low period
Clock high period
Cumulative clock low slave
extend time
Cumulative clock low master
extend time
TBUF
TLOW:SEXT
TLOW:MEXT
Notes: 1.
Typ.
Max.
Unit
100
kHz
51.2
kHz
4.7
µs
4.0
4.7
4.0
0
300
250
25
4.7
4.0
50
µs
µs
µs
ns
ns
ns
ms
µs
µs
See Note 3
25
ms
See Note 4
10
ms
Receive mode
Transmit mode
See Note 1
See Note 2
35
The bq2060 will time out when any clock low exceeds TTIMEOUT.
2. THIGH Max. is minimum bus idle time. SMBC = SMBD = 1 for t > 50µs will cause reset of any
transaction involving bq2060 that is in progress.
3. TLOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message
from initial start to the stop. The bq2060 typically extends the clock only 20µs as a slave in the read
byte or write byte protocol.
4. TLOW:MEXT is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop. The bq2060 typically extends the clock only 20µs as a master in
the read byte or write byte protocol.
HDQ16 AC Specifications (VCC = 2.7–3.7V, TOPR = -20–70 C, Unless Otherwise Noted)
Symbol
Parameter
Min.
Typ.
Max.
Unit
tCYCH
Cycle time, host to bq2060 (write)
Conditions
190
-
-
µs
tCYCB
Cycle time, bq2060 to host (read)
190
205
250
µs
tSTRH
Start hold time, host to bq2060 (write)
5
-
-
ns
tSTRB
Start hold time, host to bq2060 (read)
32
-
-
µs
tDSU
Data setup time
-
-
50
µs
tDSUB
Data setup time
-
-
50
µs
tDH
Data hold time
100
-
-
µs
tDV
Data valid time
80
-
-
µs
tSSU
Stop setup time
-
-
145
µs
tSSUB
Stop setup time
-
-
145
µs
tRSPS
Response time, bq2060 to host
190
-
320
µs
tB
Break time
190
-
-
µs
tBR
Break recovery time
40
-
-
µs
42
bq2060
SMBus Timing Data
HDQ16 Break Timing
tBR
tB
TD201803.eps
HDQ16 Host to bq2060
Write "1"
Write "0"
tSTRH
tDSU
tDH
tSSU
tCYCH
HDQ16 bq2060 to Host
Read "1"
Read "0"
tSTRB
tDSUB
tDV
tSSUB
tCYCB
TD201805.eps
43
Ordering Information
bq2060
-E411
Tape and Reel
blank = tubes
TR = tape and reel
Package Option:
SS = 28-pin SSOP (DBQ)
Device:
bq2060 SBS v1.1-Compliant Gas Gauge IC
44
Data Sheet Revision History
Change
No.
Page No.
Description
Nature of Change
1
1
V-to-F Converter offset
Was: 20µV
Is: 16µV
2
1
Calibration of true battery
capacity
Was: from a programmable level of full to empty
Is: from programmable near full to near empty levels
3
3
Digital filter operation
Was: does not integrate charge or discharge counts
Is: does not measure charge or discharge counts
Was: flowing through the sense resistor because of offset.
Is: flowing through the sense resistor
4
5
Figure 2. Bq2060 Operational
Overview
Add Light Discharge Compensation input. Delete Suspend Compensation box.
Was:
Is:
FCC ( new) = DCR + (FCC * BatteryLow%)
5
6
Equation for value of FCC
FCC(new) = DCR(final) =
DCR(initial) + measured discharge to EDV2
+(FCC´ BatteryLow%)
Battery Low% = (value stored in EE 0x54) ¸ 2.56
6
6
Battery voltage threshold for
qualified discharge
Was: voltage was greater than the EDV2 threshold
Is: voltage was less than the EDV2 threshold
7
6
End-of-discharge thresholds
Was: three compensated low-voltage thresholds
Is: three low-voltage thresholds
8
7
Table 3 header
Was: Access
Is: SMBus Access
Was: The bq2060 resumes EDV threshold detection after
Current() drops below the overload current threshold.
9
8
EDV threshold reset
10
8
Self-discharge estimation rate
Is: The bq2060 resumes EDV threshold detection after
Current() drops below the overload current threshold.
Any EDV threshold detected will be reset after 10mAh of
charge are applied.
Was: estimation for 25°C
Is: estimation rate for 25°C
Was:
Self - Discharge Update Time =
640·13500
256· n´ (Y % per day)
Is:
Self - Discharge Update Time =
11
8
Replace times sign with
mathematical bullet
640·13500
256· n · (Y % per day)
Was:
640·13500
256· n´ (Y % per day)
Is:
640·13500
256· n· (Y % per day)
45
= 6750 seconds
= 6750 seconds
seconds
seconds
Was: On detecting an overcurrent condition, the bq2060
sets the ChargingCurrent() to zero and sets the
TERMINATE_CHARGE_ALARM bit in Battery
Status(). The overcurrent condition and TERMINATE_
CHARGE_ALARM are cleared when the measured
current drops below the ChargingCurrent plus the
Overcurrent Margin.
12
10
Typos in overcurrent condition
Is: On detecting an overcurrent condition, the bq2060
sets the ChargingCurrent() to zero and sets the
TERMINATE_CHARGE_ALARM bit in Battery
Status(). The overcurrent condition and TERMINATE_
CHARGE_ALARM are cleared when the measured
current drops below the ChargingCurrent plus the
Overcurrent Margin.
13
10
Typo in Overvoltage
Was: BatteryStat-us()
Is: BatteryStatus()
14
10
Overtemperature criterion
Was: An over-temperature condition exists when
Temperature() exceeds the Max T value programmed in
EE 0x45 (most significant nibble).
Is: An over-temperature condition exists when
Temperature() is greater than or equal to the Max T
value programmed in EE 0x45 (most significant nibble).
15
10
Overtemperature cleared
Was: drops 5 degrees C below the Max T value or 43°C.
Is: is equal to or below (Max T – 5°C) or 43°C.
16
11
Extensive changes in Table 6:
Alarm and Status Bit Summary
Was: See Table 6 in SLUS035C.
Is: See Table 6 in SLUS035D.
Fifth LED function
Was: A 5th LED can be used with the 4 LED display
option to show when the battery capacity is equal to
100%.
Is: A 5th LED can be used with the 4 LED display option
to show when the battery capacity is ≥ to 100%.
Was: Detection of the transition activates the display
and starts a display timer that advances for four
seconds.
Is: Detection of the transition activates the display and
starts a four-second display timer.
17
12
18
12
Display activation
19
12
Display disabling
Was: Unless noted, EDV0 = 0.
Is: The display is disabled if EDV0 = 1.
20
15
SMBus On and Off State
Was: OH State detection
Is: Off State detection
21
15
Removal of tRR from Figure 6
Was: See Fig. 6 in SLUS035C.
Is: See Fig. 6 in SLUS035D.
22
23
16
19
ManufacturerAccess description
Time between settings of
ALARM_MODE bit
Was: This function provides writable command codes to
control the bq2060 during normal operation and pack
manufacture.
Is: These commands can be ignored if sent within one
second after a device reset.
Was: An SMBus host that does not want the bq2060 to
be a master on the SMBus must therefore continually
set this bit at least once per 45s . . . .
Is: To prevent the bq2060 from becoming a master on the
SMBus, an SMBus host must therefore continually set
this bit at least once per 50s . . . .
46
bq2060
Was: When cleared, the bq2060 transmits the
ChargingCurrent() and ChargingVoltage() values to the
Smart Battery Charger when charging is desired.
Is: When cleared, the bq2060 transmits the
ChargingCurrent() and ChargingVoltage() values to the
Smart Battery Charger.
24
19
Enabling transmission of
ChargingCurrent() and
ChargingVoltage()
25
24
ChargingCurrent()
Was: Range: 0 to 61,456mA
Is: Range: 0 to 65,535mA
26
24
ChargingVoltage()
Was: Range: 0 to 61,456mV
Is: Range: 0 to 65,535mV
Was: temperature is greater than allowed by the MaxT
limit
Setting OVER_TEMP_ALARM bit
Is: temperature is greater than or equal to the MaxT
limit
27
25
28
27
Setting ManufacturerName()
Was: sets ManufacturerName() to the value programmed
in Manufacturer Name EE 0x20–0x26
Is: sets ManufacturerName() to the value programmed
in Manufacturer Name EE 0x20–0x2a
29
27
ManufacturerData() description
Was: critical EEPROM programming parameters
Is: critical operating parameters
30
27
ManufacturerData() purpose
Was: calculated EDV threshold
Is: pending EDV threshold voltage
31
28
Move paragraph from CVUV to
Pack Status and Pack Configuration
Was:
Is: The Pack Configuration register reflects how the
bq2060 is configured as defined by the value
programmed in Pack Configuration in EE 0x3f.
32
28
Introduce Pack Status Register
table
Was:
Is: The Pack Status Register consists of the following
bits:
33
28
Pack Status EDV2 bit = 0
Was: Voltage() > EDV2 threshold
Is: Voltage() > EDV2 threshold (discharging)
34
28
EINT bit function
Was: The EDV2 bits indicate
Is: The EDV2 bit indicates
Setting the digital filter threshold,
VDF (µV)
Was: The desired digital filter threshold, VDF (µV), is
set by calculating the value stored in Digital Filter EE
0x52.
Is: The digital filter threshold, VDF (µV), is set by the
value stored in Digital Filter EE 0x52.
35
32
36
32
Pack capacity storage
Was: Pack capacity is programmed in mAh units to Pack
Capacity in EE 0x3a–0x3b and Last Measured Discharge
in EE 0x38–0x39.
Is: Pack capacity in mAh units is stored in Pack
Capacity EE 0x3a–0x3b.
37
32
Last Measured Discharge initial
value storage
Was:
Is: The initial value for Last Measured Discharge in mAh
is stored in EE 0x38–0x39.
47
bq2060
38
32
EDV compensation
39
33
FBL equation term definition
40
34
Self-discharge rate
41
35
Was: If EDV compensation is enabled, the bq2060
calculates battery voltage to determine EDV0, EDV1,
EDV2 as a function of EDV, battery capacity,
temperature, and discharge load
Is: If EDV compensation is enabled, the bq2060
calculates battery voltage to determine EDV0, EDV1,
and EDV2 thresholds as a function of battery capacity,
temperature, and discharge load.
Was: C is 0%, 3%, or Battery Low % for EDV0, EDV1,
and EDV2, respectively and C0 is the capacity related
EDV adjustment factors.
Is: C (0%, 3%, or Battery Low % for EDV0, EDV1, and
EDV2, respectively) and C0 are the capacity related
EDV adjustment factors.
æ
52.73 ö
÷
Was: Self - Discharge Rate = 2s ç
è %PERDAY ø
æ
52.73 ö
÷
Is: Self - Discharge Rate = 256 -ç
è %PERDAY ø
é 69 - MAXTEMP
ù
Was: MaxT = Intê
+ 0.5ú
ë
û
1.6
é 69 - MAXTEMP ù
Is: MaxT =ê
ú
ë
û
1.6
Temperature threshold equation
Was: The bq2060 sets update RM with a programmed
percentage of FCC.
Is: The bq2060 updates RM with a programmed
percentage of FCC at a valid charge termination.
42
36
CSYNC bit = 1
43
36
CEDV
Was: If reset, the bq2060 uses the values . . .
Is: If reset, the bq2060 uses the fixed values . . .
44
38
CPE bit = 0
Was: No PEC byte on alarm warning to charger
Is: No PEC byte on broadcasts to charger
45
38
CPE bit = 1
Was: PEC byte on alarm warning to charger
Is: PEC byte on broadcasts to charger
46
38
ADC Offset
Was: adjusts the ADC offset
Is: adjusts the ADC reading
47
38
ADC Offset
Was: ADC Offset is typically set between -10 and 10.
Is: ADC Offset is typically set between -20 and 20.
48
39
VFC
Was: to calibrate the coulomb counting measurement for
system errors and sense resistor error
Is: to calibrate the coulomb counting measurement for
VFC gain errors and sense resistor tolerance
49
39
VFC
Was: opposite in sign as
Is: opposite in sign to
50
40
Extensive changes in DC Electrical
Characteristics table
Was: SLUS035C version
Is: SLUS035D version
51
40
VFC Characteristics table VSROS
minimum/typical/maximum
Was: -300/-50/250
Is: -250/-50/250
52
41
VFC Characteristics
Was: VCC = 3.1–3.5V
Is: VCC = 3.1–3.6V
48
53
41
REG Characteristics
Was: VCC = 3.5V (max)
Is: VCC = 3.6V (max)
54
41
VFC Characteristics table RMVCO
conditions
Was: VCC = 3.5V
Is: VCC = 3.3V
55
41
VFC Characteristics table Note
Was: Note: RMTCO total deviation is from the gain at
25°C.
Is: Note: RMTCO total deviation is from the nominal gain
at 25°C.
56
41
REG Characteristics table title
Was: REG Characteristics
Is: REG Characteristics (TOPR = -20–70°C)
57
42
SMBus AC Specifications table
title
Was: SMBus AC Specifications (TA = TOPR, 2.9V < VCC <
3.7V unless otherwise noted)
Is: SMBus AC Specifications (VCC = 2.7–3.7V, TOPR =
-20–70°C, Unless Otherwise Noted)
58
42
59
42
HDQ16 AC Specifications table
tDH minimum
Was: 90µs
Is: 100µs
60
42
HDQ16 AC Specifications table
tRSPS minimum
Was: 320µs
Is: 190µs
61
42
HDQ16 AC Specifications table
tRSPS maximum
Was: Is: 320ms
62
45
HDQ16 AC Specifications table
title
Was: HDQ16 AC Specifications (TA = TOPR, 2.9V < VCC <
3.7V unless otherwise noted)
Is: HDQ16 AC Specifications (VCC = 2.7–3.7V, TOPR =
-20–70°C, Unless Otherwise Noted)
Replace package diagram and
Ordering Information Package
Option with SS = 28-pin SSOP
(DBQ)
Was: SLUS035C version
Is: SLUS035D version
49
PACKAGE OPTION ADDENDUM
www.ti.com
4-Mar-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
BQ2060SS-E207-EP
ACTIVE
SSOP/
QSOP
DBQ
28
40
None
CU NIPDAU
Level-1-220C-UNLIM
BQ2060SS-E207TR-EP
ACTIVE
SSOP/
QSOP
DBQ
28
2500
None
CU NIPDAU
Level-1-220C-UNLIM
BQ2060SS-E411
ACTIVE
SSOP/
QSOP
DBQ
28
40
None
CU NIPDAU
Level-1-220C-UNLIM
BQ2060SS-E411TR
ACTIVE
SSOP/
QSOP
DBQ
28
2500
None
CU NIPDAU
Level-1-220C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
Telephony
www.ti.com/telephony
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2005, Texas Instruments Incorporated