TI TMP513AIDR

TMP512
TMP513
www.ti.com
SBOS491 – JUNE 2010
Temperature and Power Supply System Monitors
Check for Samples: TMP512, TMP513
FEATURES
DESCRIPTION
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The
TMP512
(dual-channel)
and
TMP513
(triple-channel) are system monitors that include
remote sensors, a local temperature sensor, and a
high-side current shunt monitor. These system
monitors have the capability of measuring remote
temperatures, on-chip temperatures, and system
voltage/power/current consumption.
1
234
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±1°C REMOTE DIODE SENSORS
±1°C LOCAL TEMPERATURE SENSOR
SERIES RESISTANCE CANCELLATION
n-FACTOR CORRECTION
TEMPERATURE ALERT FUNCTION
AVERAGING
12-BIT RESOLUTION
DIODE FAULT DETECTION
SENSES BUS VOLTAGES FROM 0V TO +26V
REPORTS CURRENT IN AMPS, VOLTAGE IN
VOLTS AND POWER IN WATTS
HIGH ACCURACY: 1% MAX OVER TEMP
WATCHDOG LIMITS:
– Upper Over-Limit
– Lower Under-Limit
APPLICATIONS
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DESKTOP AND NOTEBOOK COMPUTERS
SERVERS
INDUSTRIAL CONTROLLERS
CENTRAL OFFICE TELECOM EQUIPMENT
LCD/ DLP®/LCOS PROJECTORS
STORAGE AREA NETWORKS (SAN)
The remote temperature sensor diode-connected
transistors are typically low-cost, NPN- or PNP-type
transistors or diodes that are an integral part of
microcontrollers,
microprocessors,
or
FPGAs.
Remote accuracy is ±1°C for multiple IC
manufacturers, with no calibration needed. The
two-wire serial interface accepts SMBus™ or
two-wire write and read commands.
The onboard current shunt monitor is a high-side
current shunt and power monitor. It monitors both the
shunt drop and supply voltage. A programmable
calibration value (along with the TMP512/TMP513
internal digital multiplier) enables direct readout in
amps; an additional multiplication calculates power in
watts. The TMP512 and TMP513 both feature two
separate onboard watchdog capabilities: an over-limit
comparator and a lower-limit comparator.
These devices use a single +3V to +26V supply,
drawing a maximum of 1.4mA of supply current, and
they are specified for operation from –40°C to
+125°C.
TMP512
TMP513
Mux
DXP1
Low-Pass Filter
DXN1
ADC
DXP2
DXN2
Internal
Diode
Temperature
Sensor
DXP3
DXN3
V+
Subregulator
3.3V
Filter C
A0
Power Register
ALERT
Current Register
VIN+
Two-Wire
Interface
ADC
VIN-
Voltage Register
GND
SDA
SCL
GPIO
1
2
3
4
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DLP is a registered trademark of Texas Instruments.
SMBus is a trademark of Intel Corporation.
All other trademarks are the property of their respective owners.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated
TMP512
TMP513
SBOS491 – JUNE 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE INFORMATION (1)
PRODUCT
PACKAGE-LEAD
PACKAGE DESIGNATOR
PACKAGE MARKING
TMP512
SO-14
D
TMP512A
SO-16
D
TMP513A
QFN-16 (2)
RSA
TMP513A
TMP513
(1)
(2)
For the most current package and ordering information see the Package Option Addendum at the end of this document, or visit the
TMP512/TMP513 product folder at www.ti.com.
Product preview device.
ABSOLUTE MAXIMUM RATINGS (1)
Over operating free-air temperature range (unless otherwise noted).
Supply Voltage, V+
TMP512, TMP513
UNIT
26
V
Voltage
GND – 0.3 to +6
V
Current
10
mA
Differential (VIN+) – (VIN–) (2)
–26 to +26
V
Common-Mode
–0.3 to +26
V
GND – 0.3 to +6
V
GND – 0.3 to V+ + 0.3
V
Input Current Into Any Pin
5
mA
Open-Drain Digital Output Current
10
mA
–65 to +150
°C
Filter C
Analog Inputs, VIN+, VIN–
Open-Drain Digital Outputs
GPIO, DXP, DXN
Storage Temperature
Junction Temperature
ESD Ratings
(1)
(2)
2
+150
°C
Human Body Model (HBM)
2000
V
Charged-Device Model (CDM)
1000
V
Machine Model (MM)
150
V
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
VIN+ and VIN– may have a differential voltage of –26V to +26V; however, the voltage at these pins must not exceed the range –0.3V to
+26V.
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TMP512
TMP513
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SBOS491 – JUNE 2010
THERMAL INFORMATION
THERMAL METRIC
TMP512
TMP513AID
TMP513AIRSAR
TMP513AIRSAT
D (SOIC)
D (SOIC)
RSA
(1)
14
16
16
qJA
Junction-to-ambient thermal resistance (2)
91.1
77.6
44.8
qJC(top)
Junction-to-case(top) thermal resistance (3)
10.6
55.0
43.8
(4)
qJB
Junction-to-board thermal resistance
40.3
49.9
14.7
yJT
Junction-to-top characterization parameter (5)
49.1
3.5
0.4
yJB
Junction-to-board characterization parameter (6)
47.5
32.2
14.5
n/a
n/a
2.6
qJC(bottom)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Junction-to-case(bottom) thermal resistance
(7)
UNITS
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific
JEDEC-standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB
temperature, as described in JESD51-8.
The junction-to-top characterization parameter, yJT, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining qJA, using a procedure described in JESD51-2a (sections 6 and 7).
The junction-to-board characterization parameter, yJB, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining qJA , using a procedure described in JESD51-2a (sections 6 and 7).
The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific
JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
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3
TMP512
TMP513
SBOS491 – JUNE 2010
www.ti.com
ELECTRICAL CHARACTERISTICS: V+ = +12V
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG (1) = 1, unless otherwise noted.
TMP512, TMP513
PARAMETER
TEST CONDITIONS
MIN
PGA = ÷ 1
PGA = ÷ 2
TYP
MAX
UNIT
0
±40
mV
0
±80
mV
PGA = ÷ 4
0
±160
mV
PGA = ÷ 8
0
±320
mV
BRNG = 0
0
16
V
BRNG = 1
0
32
VIN+ = 0V to 26V
100
INPUT
Current Sense (Input) Voltage Range
Bus Voltage (Input Voltage) Range (2)
Common-Mode Rejection
Offset Voltage, RTI (3)
CMRR
VOS
PSRR
±10
±100
mV
PGA = ÷ 2
±20
±125
mV
PGA = ÷ 4
±30
±150
mV
PGA = ÷ 8
±40
±200
mV
0.2
mV/°C
V+ = 3V to 5.5V, Configuration 3 (4)
10
mV/V
V+ = 4.5V to 26V, subregulator supply
0.1
mV/V
±0.04
%
0.0025
%
Current Sense Gain Error
vs Temperature
Input Impedance
V
dB
PGA = ÷ 1
vs Temperature
vs Power Supply
120
Active Mode
VIN+ Pin
20
mA
VIN– Pin
20 || 320
mA || kΩ
Input Leakage
Power-Down Mode
VIN+ Pin
0.1
0.5
mA
VIN– Pin
0.1
0.5
mA
DC ACCURACY
ADC Basic Resolution
12
Bits
1 LSB Step Size
Shunt Voltage
10
mV
Bus Voltage
4
mV
Current Measurement Error
±0.2
over Temperature
Bus Voltage Measurement Error
±0.2
over Temperature
±0.5
%
±1
%
±0.5
%
±1
Differential Nonlinearity
±0.1
%
LSB
ADC TIMING
ADC Conversion Time
(1)
(2)
(3)
(4)
4
12-Bit
665
733
ms
11-Bit
345
380
ms
10-Bit
185
204
ms
9-Bit
105
117
ms
BRNG is bit 13 of Configuration Register 1.
This parameter only expresses the full-scale range of the ADC scaling. In no event should more than 26V be applied to this device.
Referred-to-input (RTI).
See Subregulator section.
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TMP512
TMP513
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SBOS491 – JUNE 2010
ELECTRICAL CHARACTERISTICS: V+ = +12V (continued)
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG (1) = 1, unless otherwise noted.
TMP512, TMP513
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TEMPERATURE ERROR
Local Temperature Sensor
Remote Temperature Sensor (5)
TELOCAL
TEREMOTE
vs Supply, Local
vs Supply, Remote
TA = –40°C to +125°C
±1.25
±2.5
°C
TA = +15°C to +85°C, V+ = 12V
±0.25
±1
°C
TA = +15°C to +85°C, TD = –40°C to+
150°C, V+ = 12V
±0.25
±1
°C
TA = –40°C to +100°C, TD = –40°C to
+150°C, V+ = 12V
±1
±3
°C
TA = –40°C to +125°C, TD = –40°C to
+150°C
±3
±5
°C
V+ = 3V to 5.5V, Configuration 3 (6)
0.2
0.5
°C/V
V+ = 3V to 5.5V, Configuration 3 (6)
0.2
0.5
°C/V
V+ = 4.5V to 26V, subregulator supply
0.01
0.05
°C/V
115
130
ms
TEMPERATURE MEASUREMENT
Conversion Time (per channel)
100
Resolution
Local Temperature Sensor
13
Bits
Remote Temperature Sensor
13
Bits
High
120
mA
Medium High
60
mA
Medium Low
12
mA
Low
6
mA
Remote Sensor Source Currents
Default Non-Ideality Factor
Series Resistance 3kΩ max
n
TMP512/12 Optimized Ideality Factor
1.008
SMBus
Logic Input High Voltage (SCL, SDA, GPIO,
A0)
VIH
Logic Input Low Voltage (SCL, SDA, GPIO,
A0)
VIL
2.1
0.8
Hysteresis
500
SMBus Output Low Sink Current
SDA Output Low Voltage
V
mV
6
VOL
IOUT = 6mA
0 ≤ VIN ≤ 6V
Logic Input Current
mA
0.15
–1
SMBus Input Capacitance (SCL, SDA, GPIO, A0)
0.4
V
1
mA
3
SMBus Clock Frequency
SMBus Timeout (7)
25
V
30
SCL Falling Edge to SDA Valid Time
pF
3.4
MHz
35
ms
1
ms
POWER SUPPLY
Specified Supply Range (6)
+26
V
Quiescent Current
V+
+3
1
1.4
mA
Quiescent Current, Power-Down Mode
55
100
mA
Power-On Reset Threshold
2
V
TEMPERATURE RANGE
Specified Temperature Range
(5)
(6)
(7)
–40
+125
°C
Tested with one-shot measurements, and with less than 5Ω effective series resistance, and with 100pF differential input capacitance.
See Subregulator section.
SMBus timeout in the TMP512/13 resets the interface any time SCL or SDA is low for over 28ms.
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TMP512
TMP513
SBOS491 – JUNE 2010
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PIN CONFIGURATIONS
TMP512
space
D PACKAGE
SO-14
(TOP VIEW)
Filter C
1
14
GND
V+
2
13
ALERT
VIN+
3
12
GPIO
VIN-
4
11
DXN2
SDA
5
10
DXP2
SCL
6
9
DXN1
A0
7
8
DXP1
TMP512
TMP512: PIN DESCRIPTIONS
6
PIN NO.
NAME
DESCRIPTION
1
Filter C
Subregulator output and filter capacitor pin.
2
V+
Positive supply voltage (3V to 26V) See Figure 20.
3
VIN+
Positive differential shunt voltage. Connect to positive side of shunt resistor.
4
VIN-
Negative differential shunt voltage. Connect to negative side of shunt resistor. Bus voltage is measured
from this pin to ground.
5
SDA
Serial bus data line for SMBus, open-drain; requires pull-up resistor.
6
SCL
Serial bus clock line for SMBus, open-drain; requires pull-up resistor.
7
A0
Address pin
8
DXP1
Channel 1 positive connection to remote temperature sensor.
9
DXN1
Channel 1 negative connection to remote temperature sensor.
10
DXP2
Channel 2 positive connection to remote temperature sensor.
11
DXN2
Channel 2 negative connection to remote temperature sensor.
12
GPIO
General-purpose, user-programmable input/output. Totem-pole output. Connect to ground or supply
through a resistor if not used. Default state is as an input.
13
ALERT
Open-drain SMBus alert output. Controlled in SMBus Alert Mask Register. Default state is disabled.
14
GND
Ground
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TMP513
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SBOS491 – JUNE 2010
TMP513
space
D PACKAGE
SO-16
(TOP VIEW)
ALERT
VIN+
3
14
GPIO
VIN-
4
13
DXN3
VIN+
1
12
DXP3
VIN-
2
ALERT
15
13
2
GND
V+
14
GND
Filter C
16
15
1
V+
Filter C
16
RSA PACKAGE(1)
QFN-16
(TOP VIEW)
12
GPIO
11
DXN3
TMP513
SDA
5
TMP513
A0
7
10
DXP2
SCL
4
9
DXN2
DXP1
8
9
DXN1
(1)
8
DXP3
DXP2
10
7
3
DXN1
SDA
6
DXN2
DXP1
11
5
6
A0
SCL
Product preview device.
TMP513: PIN DESCRIPTIONS
D PACKAGE
SO-16
RSA
PACKAGE
QFN-16
NAME
DESCRIPTION
1
15
Filter C
Subregulator output and filter capacitor pin.
2
16
V+
3
1
VIN+
Positive differential shunt voltage. Connect to positive side of shunt resistor.
4
2
VIN-
Negative differential shunt voltage. Connect to negative side of shunt resistor. Bus voltage is
measured from this pin to ground.
5
3
SDA
Serial bus data line for SMBus, open-drain; requires pull-up resistor.
6
4
SCL
Serial bus clock line for SMBus, open-drain; requires pull-up resistor.
7
5
A0
8
6
DXP1
Channel 1 positive connection to remote temperature sensor.
9
7
DXN1
Channel 1 negative connection to remote temperature sensor.
10
8
DXP2
Channel 2 positive connection to remote temperature sensor.
11
9
DXN2
Channel 2 negative connection to remote temperature sensor.
12
10
DXP3
Channel 3 positive connection to remote temperature sensor.
13
11
DXN3
Channel 3 negative connection to remote temperature sensor.
14
12
GPIO
General-purpose, user-programmable input/output. Totem-pole output. Connect to ground or
supply through a resistor if not used. Default state is as an input.
15
13
ALERT
16
14
GND
Positive supply voltage (3V to 26V) See Figure 20.
Address pin
Open-drain SMBus alert output. Controlled in SMBus Alert Mask Register. Default state is
disabled.
Ground
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TMP512
TMP513
SBOS491 – JUNE 2010
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TYPICAL CHARACTERISTICS: V+ = +12V
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted.
FREQUENCY RESPONSE
REMOTE TEMPERATURE ERROR vs TEMPERATURE
0
Remote Temperature Error (?C)
-10
-20
Gain (dB)
-30
-40
-50
-60
-70
-80
-90
-100
1k
100
10
10k
100k
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
34 Units Shown
0
-40 -25
1M
25
Figure 1.
LOCAL TEMPERATURE ERROR vs TEMPERATURE
SHUNT OFFSET vs TEMPERATURE
40mV Range
10
80mV Range
1.0
0.5
Offset (mV)
Local Temperature Error (°C)
14 Units Shown
0
-0.5
5
0
320mV Range
-5
160mV Range
-1.0
-10
-1.5
-2.0
-40 -25
-15
0
25
50
75
100
0
-40 -25
125
25
Ambient Temperature (°C)
75
100
125
Figure 4.
SHUNT GAIN ERROR vs TEMPERATURE
BUS VOLTAGE OFFSET vs TEMPERATURE
250
35
30
200
25
150
32V Range
20
320mV Range
Offset (mV)
Gain Error (m%)
50
Temperature (°C)
Figure 3.
160mV Range
50
80mV Range
15
10
5
16V Range
0
0
-5
-10
40mV Range
-100
-40 -25
0
25
50
75
100
125
-15
-40 -25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Figure 5.
8
125
15
1.5
-50
100
Figure 2.
2.0
100
75
50
Ambient Temperature (?C)
Input Frequency (Hz)
Figure 6.
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TMP513
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SBOS491 – JUNE 2010
TYPICAL CHARACTERISTICS: V+ = +12V (continued)
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted.
INTEGRAL NONLINEARITY vs INPUT VOLTAGE
20
200
15
10
150
32V Range
100
INL (mV)
Gain Error (m%)
BUS GAIN ERROR vs TEMPERATURE
250
50
5
0
-5
0
-10
16V Range
-50
-15
-100
0
-40 -25
25
50
75
100
-20
-0.4
125
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
Input Voltage (V)
Temperature (°C)
Figure 7.
Figure 8.
INPUT CURRENTS WITH LARGE DIFFERENTIAL
VOLTAGES
(VIN+ at 12V, Sweep of VIN–)
ACTIVE IQ vs TEMPERATURE
2.0
1.4
V+ = 5.5V
Current into VIN-
V+ = 5.5V
1.5
1.2
1.0
0.5
IQ (mA)
Input Currents (mA)
V+ = 12V
1.0
V+ = 3V
0
V+ = 3V
-0.5
V+ = 3V
0.8
0.6
0.4
-1.0
0.2
Current into VIN+
V+ = 5.5V
-1.5
0
5
10
15
20
25
30
0
-40 -25
VIN- Voltage (V)
0
25
50
75
100
125
Temperature (°C)
Figure 9.
Figure 10.
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TMP513
SBOS491 – JUNE 2010
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TYPICAL CHARACTERISTICS: V+ = +12V (continued)
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted.
SHUTDOWN IQ vs
SUPPLY VOLTAGE
SHUTDOWN IQ vs TEMPERATURE
120
140
120
100
V+ = 5.5V
80
80
IQ (mA)
IQ (mA)
100
V+ = 12V
60
60
40
40
V+ = 3V
20
20
Note: Shutdown IQ vs Temperature is
for Subregulator Configurations 1 and 2
Note: Shutdown IQ vs VS is for Subregulator Configuration 3
0
0
-40 -25
0
25
50
75
100
125
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VS (V)
Temperature (°C)
Figure 11.
Figure 12.
ACTIVE IQ vs TWO-WIRE CLOCK FREQUENCY
SHUTDOWN IQ vs TWO-WIRE CLOCK FREQUENCY
1100
250
V+ = 12V
1050
200
IQ (mA)
IQ (mA)
V+ = 12V
V+ = 3.3V
1000
950
150
100
900
V+ = 3.3V
50
850
800
0
1k
10k
100k
1M
10M
1k
SCL Frequency (Hz)
100k
1M
10M
SCL Frequency (Hz)
Figure 13.
10
10k
Figure 14.
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SBOS491 – JUNE 2010
TYPICAL CHARACTERISTICS: V+ = +12V (continued)
At TA = +25°C, V+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted.
REMOTE TEMPERATURE ERROR vs SERIES
RESISTANCE
(GND Collector-Connected Transistor, 2N3906 PNP)
2.0
2.0
1.5
1.5
Remote Temperature Error (°C)
Remote Temperature Error (°C)
REMOTE TEMPERATURE ERROR vs SERIES
RESISTANCE
(Diode-Connected Transistor, 2N3906 PNP)
1.0
0.5
0
-0.5
-1.0
-1.5
Note: For all three subregulator configurations.
-2.0
1.0
0.5
0
-0.5
-1.0
-1.5
Note: For all three subregulator configurations.
-2.0
0
500
1000
1500
2000
2500
3000
3500
0
500
1000
RS (W)
1500
2000
2500
3000
3500
RS (W)
Figure 15.
Figure 16.
REMOTE TEMPERATURE ERROR
vs DIFFERENTIAL CAPACITANCE
Remote Temperature Error (°C)
3
2
1
0
-1
-2
-3
0
0.5
1.0
1.5
2.0
2.5
3.0
Capacitance (nF)
Figure 17.
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PARAMETRIC MEASUREMENT INFORMATION
TYPICAL CONNECTIONS
SERIES RESISTANCE CONFIGURATION
(a) GND Collector-Connected Transistor
RS1
(1)
DXP
DXN
RS2
(1)
(b) Diode-Connected Transistor
RS1
(1)
DXP
DXN
RS2
(1)
(1)
RS1 + RS2 should be less than 1kΩ; see Filtering section.
Figure 18.
DIFFERENTIAL CAPACITANCE CONFIGURATION
(a) GND Collector-Connected Transistor
DXP
CDIFF
(1)
DXN
(b) Diode-Connected Transistor
DXP
CDIFF
(1)
DXN
(1)
CDIFF should be less than 2200pF; see Filtering section.
Figure 19.
12
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APPLICATION INFORMATION
DESCRIPTION
The TMP512/13 are digital temperature sensors with
a digital current-shunt monitor that combine a local
die temperature measurement channel and remote
junction temperature measurement channels: two for
the TMP512 and three for the TMP513. The
TMP512/13 contain multiple registers for holding
configuration information, temperature, and voltage
measurement results. These devices provide digital
current, voltage, and power readings necessary for
accurate decision-making in precisely-controlled
systems. Programmable registers allow flexible
configuration for setting warning limits, measurement
resolution,
and
continuous-versus-triggered
operation. Detailed register information appears at
the end of this data sheet, beginning with Table 3.
For proper remote temperature sensing operation, the
TMP512 requires transistors connected between
DXP1 and DXN1 and between DXP2 and DXN2, and
for the TMP513, between DXP3 and DXN3 as well.
Unused channels on the TMP512/13 must be
connected to GND.
The TMP512/13 offer compatibility with two-wire and
SMBus interfaces. The two-wire and SMBus
protocols are essentially compatible with each other.
Two-wire is used throughout this data sheet, with
SMBus being specified only when a difference
Bus Voltage Range = 4.5V to 26V
V+ = 4.5V to 26V
SUBREGULATOR
The subregulator can be configured to three different
modes of operation. Each mode has its advantage
and limitation. Figure 20 shows the three
configuration
arrangements.
The
minimum
capacitance on the Filter C pin for Configurations 1
and 2 is 470nF. The minimum capacitance on the
Filter C pin for Configuration 3 is 100nF.
Configuration 1 has V+ and VIN+ tied together. V+
supplies the subregulator, which in turn supplies the
3.3V to the Filter C pin and the internal die. With the
V+ supply range of 4.5V to 26V connected to the
shunt voltage, the bus voltage range cannot go to
zero and is limited to 4.5V to 26V.
Configuration 2 has V+ to the subregulator without
any other connections. Under this configuration, the
bus voltage range can go from 0V to 26V, because it
is not limited to 4.5V as in Configuration 1.
Configuration 3 has the subregulator V+ and Filter C
pins shorted together. V+ is limited to 3V to 5.5V
because the Filter C pin supplies the internal die; it
cannot exceed this voltage range. The bus voltage
range can go from 0V to 26V, because it is not limited
to 4.5V as in Configuration 1.
Bus Voltage Range = 0V to 26V
V+ = 4.5V to 26V
Subregulator
3.3V
Filter C
Bus Voltage Range = 0V to 26V
V+ = 3V to 5.5V
Subregulator
3.3V
Filter C
470nF
100nF
VIN+
VIN+
ADC
Shunt
RSHUNT
VIN-
Load
ADC
Shunt
RSHUNT
VIN-
Load
GND
ADC
VIN-
Load
GND
Configuration 1
Subregulator
3.3V
Filter C
470nF
VIN+
Shunt
RSHUNT
between the two systems is being addressed. Two
bi-directional lines, SCL and SDA, connect the
TMP512/13 to the bus. SDA is an open-drain
connection. See Figure 21 for a typical application
circuit.
GND
Configuration 2
Configuration 3
Figure 20. Typical Subregulator Configurations
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SERIES RESISTANCE CANCELLATION
Series resistance in an application circuit that typically
results from printed circuit board (PCB) trace
resistance and remote line length is automatically
cancelled by the TMP512/13, preventing what would
otherwise result in a temperature offset. A total of up
to 3kΩ of series line resistance is cancelled by the
TMP512/13, eliminating the need for additional
characterization and temperature offset correction.
See the Remote Temperature Error vs Series
Resistance typical characteristic curves (Figure 15 )
for details on the effects of series resistance and
power-supply voltage on sensed remote temperature
error.
DIFFERENTIAL INPUT CAPACITANCE
The TMP512/13 can tolerate differential input
capacitance of up to 2200pF with minimal change in
temperature error. The effect of capacitance on
sensed remote temperature error is illustrated in
Figure 16, Remote Temperature Error vs Differential
Capacitance. See the Filtering section for suggested
component values where filtering unwanted coupled
signals is needed.
TEMPERATURE MEASUREMENT DATA
Temperature measurement data may be taken over
an operating range of –40°C to +125°C for both local
and remote locations.
The Temperature Register of the TMP512/13 is
configured as a 13-bit, read-only register that stores
the output of the most recent conversion. Two bytes
must be read to obtain data, and are described in the
14
Local Temperature Result Register and the Remote
Temperature Result Registers. Note that byte 1 is the
most significant byte, followed by byte 2, the least
significant byte. The first 13 bits are used to indicate
temperature. The least significant byte does not have
to be read if that information is not needed. The data
format for temperature is summarized in Table 10.
One LSB equals 0.0625°C. Negative numbers are
represented in binary twos complement format.
Following power-up or reset, the Temperature
Register will read 0°C until the first conversion is
complete. Unused bits in the Temperature Register
always read '0'.
REGISTER INFORMATION
The TMP512/13 contain multiple registers for holding
configuration information, temperature and voltage
measurement results, and status information. These
registers are described in Table 3.
POINTER REGISTER
The 8-bit Pointer Register is used to address a given
data register. The Pointer Register identifies which of
the data registers should respond to a read or write
command on the two-wire bus. This register is set
with every write command. A write command must be
issued to set the proper value in the Pointer Register
before executing a read command. Table 3 describes
the pointer address of the TMP512/13 registers. The
power-on reset (POR) value of the Pointer Register is
00h (0000 0000b).
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n-FACTOR CORRECTION REGISTER
The TMP512/13 allow for a different n-factor value to
be
used
for
converting
remote
channel
measurements to temperature. The remote channel
uses sequential current excitation to extract a
differential VBE voltage measurement to determine
the temperature of the remote transistor. Equation 1
describes this voltage and temperature.
I
nkT
VBE2 - VBE1 =
In 2
q
I1
(1)
(
(
The value n in Equation 1 is a characteristic of the
particular transistor used for the remote channel. The
power-on reset value for the TMP512/13 is n = 1.008.
The value in the n-Factor Correction Register may be
used to adjust the effective n-factor according to
Equation 2 and Equation 3.
1.008 ´ 300
neff =
(300 - NADJUST)
(2)
The
300 ´ 1.008
neff
n-factor
value
(
(
NADJUST = 300 -
must
(3)
be
stored
in
twos-complement format, yielding an effective data
range from –128 to +127. The n-factor value may be
written to and read from pointer address 16h for
remote channel 1, pointer address 17h for remote
channel 2, and pointer address 18h for remote
channel 3. The register power-on reset value is 00h,
thus having no effect unless the register is written to.
BUS OVERVIEW
The device that initiates the transfer is called a
master, and the devices controlled by the master are
slaves. The bus must be controlled by a master
device that generates the serial clock (SCL), controls
the bus access, and generates START and STOP
conditions.
To address a specific device, the master initiates a
START condition by pulling the data signal line (SDA)
from a HIGH to a LOW logic level while SCL is HIGH.
All slaves on the bus shift in the slave address byte
on the rising edge of SCL, with the last bit indicating
whether a read or write operation is intended. During
the ninth clock pulse, the slave being addressed
responds to the master by generating an
Acknowledge and pulling SDA LOW.
TMP512
TMP513
MUX
DXP1
Low-Pass Filter
DXN1
ADC
DXP2
DXN2
DXP3
Internal
Diode
Temperature
Sensor
DXN3
V+
Subregulator
3.3V
Filter C
3.3V Supply
´
VIN-
Two-Wire
Interface
Current Register
VIN+
Current
Shunt
A0
Power Register
ADC
ALERT
SDA
SMBus
Controller
SCL
Voltage Register
Load
GND
GPIO
Figure 21. Typical Application Circuit
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Data transfer is then initiated and eight bits of data
are sent, followed by an Acknowledge bit. During
data transfer, SDA must remain stable while SCL is
HIGH. Any change in SDA while SCL is HIGH is
interpreted as a START or STOP condition.
Once all data have been transferred, the master
generates a STOP condition, indicated by pulling
SDA from LOW to HIGH while SCL is HIGH. The
TMP512/13 includes a 28ms timeout on its interface
to prevent locking up an SMBus.
SERIAL BUS ADDRESS
To communicate with the TMP512/13, the master
must first address slave devices via a slave address
byte. The slave address byte consists of seven
address bits, and a direction bit indicating the intent
of executing a read or write operation.
The TMP512/13 feature an address pin to allow up to
four devices to be addressed on a single bus. Table 1
describes the pin logic levels used to properly
connect up to four devices. The state of the A0 pin is
sampled on every bus communication and should be
set before any activity on the interface occurs. The
address pin is read at the start of each
communication event.
Table 1. TMP512/13 Address Pins and
Slave Addresses
DEVICE TWO-WIRE
ADDRESS
A0 PIN CONNECTION
1011100
Ground
1011101
V+
1011110
SDA
1011111
SCL
SERIAL INTERFACE
The TMP512/13 operate only as slave devices on the
two-wire bus and SMBus. SCL is an input only, and
TMP512/13 cannot drive it. Connections to the bus
are made via the open-drain I/O lines SDA and SCL.
The SDA and SCL pins feature integrated spike
suppression filters and Schmitt triggers to minimize
the effects of input spikes and bus noise. The
TMP512/13 support the transmission protocol for fast
(1kHz to 400kHz) and high-speed (1kHz to 3.4MHz)
modes. All data bytes are transmitted MSB first.
16
WRITING TO/READING FROM THE
TMP512/13
Accessing a particular register on the TMP512/13 is
accomplished by writing the appropriate value to the
register pointer. Refer to Table 3 for a complete list of
registers and corresponding addresses. The value for
the register pointer as shown in Figure 24 is the first
byte transferred after the slave address byte with the
R/W bit LOW. Every write operation to the
TMP512/13 requires a value for the register pointer.
Writing to a register begins with the first byte
transmitted by the master. This byte is the slave
address, with the R/W bit LOW. The TMP512/13 then
acknowledge receipt of a valid address. The next
byte transmitted by the master is the address of the
register to which data will be written. This register
address value updates the register pointer to the
desired register. The next two bytes are written to the
register addressed by the register pointer. The
TMP512/13 acknowledge receipt of each data byte.
The master may terminate data transfer by
generating a START or STOP condition.
When reading from the TMP512/13, the last value
stored in the register pointer by a write operation
determines which register is read during a read
operation. To change the register pointer for a read
operation, a new value must be written to the register
pointer. This write is accomplished by issuing a slave
address byte with the R/W bit LOW, followed by the
register pointer byte. No additional data are required.
The master then generates a START condition and
sends the slave address byte with the R/W bit HIGH
to initiate the read command. The next byte is
transmitted by the slave and is the most significant
byte of the register indicated by the register pointer.
This byte is followed by an Acknowledge from the
master; then the slave transmits the least significant
byte. The master acknowledges receipt of the data
byte. The master may terminate data transfer by
generating a Not-Acknowledge after receiving any
data byte, or generating a START or STOP condition.
If repeated reads from the same register are desired,
it is not necessary to continually send the register
pointer bytes; the TMP512/13 retain the register
pointer value until it is changed by the next write
operation.
Figure 22 and Figure 23 show read and write
operation timing diagrams, respectively. Note that
register bytes are sent most-significant byte first,
followed by the least significant byte. See Figure 25
for an illustration of a typical register pointer
configuration.
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Start By
Master
1
1
1
1
0
1
1
1
A1
A0
(1)
9
1
D15 D14
ACK By
TMP512/TMP513
R/W
Frame 1 Two-Wire Slave Address Byte
1
1
1
A1
A0
(1)
9
1
P7
ACK By
TMP512/TMP513
R/W
P6
P4
P3
P2
D13
P1
D12
D11 D10
D9
(2)
D8
From
TMP512/TMP513
Frame 2 Data MSByte
P0
9
1
D15 D14
ACK By
TMP512/TMP513
Frame 2 Register Pointer Byte
P5
D13
9
1
D8
D7
ACK By
Master
D9
D6
9
D5
1
D7
ACK By
TMP512/TMP513
Frame 3 Data MSByte
D12 D11 D10
NOTES: (1) The value of the Slave Address Byte is determined by the settings of the A0 pin.
Refer to Table 1.
(2) Read data is from the last register pointer location. If a new register is desired, the register
pointer must be updated. See Figure 23.
(3) ACK by Master can also be sent.
0
Frame 1 Two-Wire Slave Address Byte
D4
D3
D2
From
TMP512/TMP513
D5
D4
D3
D1
(2)
D2
Frame 3 Data LSByte
D6
D0
9
9
NoACK By
Master
D0
D1
(3)
ACK By
TMP512/TMP513
Frame 4 Data LSByte
Stop
Stop By
Master
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SCL
SDA
SCL
SDA
Start By
Master
NOTE (1): The value of the Slave Address Byte is determined by the settings of the A0 pin. Refer to Table 1.
Figure 23. Timing Diagram for Read Word Format
Figure 22. Timing Diagram for Write Word Format
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ALERT
1
9
1
9
SCL
SDA
0
0
0
1
1
0
0
1
R/W
Start By
Master
0
1
1
ACK By
TMP512/TMP513
1
A1
A0
0
From
NACK By
TMP512/TMP513
Master
Frame 1 SMBus ALERT Response Address Byte
Frame 2 Slave Address Byte
Stop By
Master
(1)
NOTE (1): The value of the Slave Address Byte is determined by the settings of the A0 pin. Refer to Table 1.
Figure 24. Timing Diagram for SMBus ALERT
1
9
1
9
SCL
¼
SDA
1
0
1
1
Start By
Master
1
A1
A0
R/W
P7
P6
P5
P4
P3
P2
ACK By
TMP512/TMP513
Frame 1 Two-Wire Slave Address Byte
(1)
P1
P0
Stop
ACK By
TMP512/TMP513
Frame 2 Register Pointer Byte
NOTE (1): The value of the Slave Address Byte is determined by the settings of the A0 pin. Refer to Table 1.
Figure 25. Typical Register Pointer Set
18
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TIMING DIAGRAMS
Figure 26 describes the timing operations on the
TMP512/13. Parameters for Figure 26 are defined in
Table 2. Bus definitions are:
Bus Idle: Both SDA and SCL lines remain high.
Start Data Transfer: A change in the state of the
SDA line, from high to low, while the SCL line is high,
defines a START condition. Each data transfer
initiates with a START condition. Denoted as S in
Figure 26.
Stop Data Transfer: A change in the state of the
SDA line from low to high while the SCL line is high
defines a STOP condition. Each data transfer
terminates with a repeated START or STOP
condition. Denoted as P in Figure 26.
t(LOW)
Data Transfer: The number of data bytes transferred
between a START and a STOP condition is not
limited and is determined by the master device. The
receiver acknowledges data transfer.
Acknowledge: Each receiving device, when
addressed, is obliged to generate an Acknowledge
bit. A device that acknowledges must pull down the
SDA line during the Acknowledge clock pulse in such
a way that the SDA line is stable low during the high
period of the Acknowledge clock pulse. Setup and
hold times must be taken into account. On a master
receive, data transfer termination can be signaled by
the master generating a Not-Acknowledge on the last
byte that has been transmitted by the slave.
tF
tR
t(HDSTA)
SCL
t(HDSTA)
t(HIGH)
t(HDDAT)
t(SUSTO)
t(SUSTA)
t(SUDAT)
SDA
t(BUF)
P
S
S
P
Figure 26. Two-Wire Timing Diagram
Table 2. Timing Characteristics for Figure 26
FAST MODE
PARAMETER
HIGH-SPEED MODE
MIN
MAX
MIN
MAX
UNIT
0.4
0.001
3.4
MHz
SCL Operating Frequency
f(SCL)
0.001
Bus Free Time Between STOP and START Condition
t(BUF)
600
160
ns
Hold time after repeated START condition. After this period, the first clock
is generated.
t(HDSTA)
100
100
ns
Repeated START Condition Setup Time
t(SUSTA)
100
100
ns
STOP Condition Setup Time
t(SUSTO)
100
100
ns
Data Hold Time
t(HDDAT)
0 (1)
0 (2)
ns
Data Setup Time
t(SUDAT)
100
10
ns
SCL Clock LOW Period
t(LOW)
1300
160
ns
SCL Clock HIGH Period
t(HIGH)
600
60
ns
Clock/Data Fall Time
tF
300
160
Clock/Data Rise Time
tR
300
160
tR
1000
for SCL ≤ 100kHz
(1)
(2)
ns
ns
For cases with fall time of SCL less than 20ns and/or the rise or fall time of SDA less than 20ns, the hold time should be greater than
20ns.
For cases with a fall time of SCL less than 10ns and/or the rise or fall time of SDA less than 10ns, the hold time should be greater than
10ns.
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HIGH-SPEED MODE
SENSOR FAULT
In order for the two-wire bus to operate at frequencies
above 400kHz, the master device must issue a
High-Speed mode (Hs-mode) master code (0000
1xxx) as the first byte after a START condition to
switch the bus to high-speed operation. The
TMP512/13 do not acknowledge this byte, but switch
the input filters on SDA and SCL and the output filter
on SDA to operate in Hs-mode, allowing transfers at
up to 3.4MHz. After the Hs-mode master code has
been issued, the master transmits a START condition
to a two-wire slave address that initiates a data
transfer operation. The bus continues to operate in
Hs-mode until a STOP condition occurs on the bus.
Upon receiving the STOP condition, the TMP512/13
switch the input and output filters back to Fast mode
operation.
The TMP512/13 can sense an open circuit.
Short-circuit conditions return a value of –256°C. The
detection circuitry consists of a voltage comparator
that trips when the voltage at DXP exceeds (V+) –
0.6V (typical). The comparator output is continuously
checked during a conversion. If a fault is detected,
the OPEN bit (bit 0) in the temperature result register
is set to '1' and the rest of the register bits should be
ignored.
POWER-UP CONDITIONS
Power-up conditions apply to a software reset via the
RST bit (bit 15) in the Configuration Register, or the
two-wire bus General Call Reset. At device power up,
all Status bits are masked, and the SMBus Alert
function is disabled. All watchdog outputs default to
active low and transparent (non-latched) modes.
SHUTDOWN MODE
The TMP512/13 shutdown mode of operation allows
the user flexibility to shut down the shunt/bus voltage
measurement and the temperature measurement
functions individually.
To shut down the shunt/bus voltage measurement
function immediately, set bits 2 through 0 in
Configuration Register 1 (00h) to '000' respectively.
To shut down the shunt/bus voltage measurement
after the end of the current conversion, set bits 2
through 0 in Configuration Resister 1 (00h) to '100'
respectively.
To shut down the temperature measurement function
immediately, set bits 15 through 11 in Configuration
Register 2 (01h) to '00000' respectively. To shut
down the temperature measurement after the end of
the current conversion, set bit 15 in Configuration
Register 2 (01h) to '0'.
UNDERVOLTAGE LOCKOUT
The TMP512/13 sense when the power-supply
voltage has reached a minimum voltage level for the
ADC to function. The detection circuitry consists of a
voltage comparator that enables the ADC after the
power supply (V+) exceeds 2.7V (typical). The
comparator output is continuously checked during a
conversion. The TMP512/13 do not perform a
temperature conversion if the power supply is not
valid. The PVLD bit (see Status Register; Local
Temperature Reset Register; Remote Temperature
Reset 1, 2 and 3 Registers) of the individual
Local/Remote Temperature Result Registers are set
to '1' and the temperature result may be incorrect.
TEMPERATURE AVERAGING
The TMP512/13 average the input diode voltages
that determine the remote temperature by sampling
multiple times throughout a conversion. The
temperature result can be extracted from four
different VBE readings and is sampled 600 times in
130ms (max). Each VBE voltage is sampled 150 times
through integration capacitors that average the
results throughout the conversion time. A delta-sigma
(ΔΣ) modulator and digital filter integrate the VBE
voltages and create a sync filter averaging system. In
addition, a low-pass filter is present at the input of the
converter with a cutoff frequency of 65kHz. This
integrating topology offers superior noise immunity.
FILTERING
ONE-SHOT COMMAND
For the TMP512/13, when the temperature core is in
shutdown and the voltage core is in triggered mode, a
single conversion is started on all enabled channels
by writing a '1' to the OS bit in Configuration Register
1. This write operation starts one conversion; the
TMP512/13 returns to shutdown mode when that
conversion completes. At the end of the conversion,
the Conversion Ready flags (bit 6 and bit 5) in the
Status Register are set to indicate end of conversion.
20
When not using the remote sensor with the
TMP512/13, the DXP and DXN inputs must be
connected together to prevent meaningless fault
warnings.
Remote junction temperature sensors are usually
implemented in a noisy environment. Noise is
frequently generated by fast digital signals and if not
filtered properly will induce errors that can corrupt
temperature measurements. The TMP512/13 have a
built-in 65kHz filter on the inputs of DXP and DXN to
minimize the effects of noise. However, a bypass
capacitor placed differentially across the inputs of the
remote temperature sensor is recommended to make
the application more robust against unwanted
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Where:
n = ideality factor of remote temperature sensor.
T(°C) = actual temperature.
TERR = error in TMP512/13 because n ≠ 1.008.
Degree delta is the same for °C and K.
For n = 1.004 and T(°C) = 100°C:
1.004 - 1.008
TERR =
´ 273.15 + 100°C)
1.008
(
(
)
coupled signals. The value of this capacitor should be
between 100pF and 1nF. Some applications attain
better overall accuracy with additional series
resistance; however, this increased accuracy is
application-specific. When series resistance is added,
the total value should not be greater than 3kΩ. If
filtering is needed, suggested component values are
100pF and 50Ω on each input; exact values are
application-specific.
GENERAL CALL RESET
The TMP512/13 support reset via the two-wire
General Call address 00h (0000 0000b). The
TMP512/13 acknowledge the General Call address
and respond to the second byte. If the second byte is
06h (0000 0110b), the TMP512/13 execute a
software reset state to all TMP512/13 registers, and
abort any conversion in progress. The TMP512/13
take no action in response to other values in the
second byte.
REMOTE SENSING
The TMP512/13 are designed to be used with either
discrete transistors or substrate transistors built into
processor chips and ASICs. Either NPN or PNP
transistors can be used, as long as the base-emitter
junction is used as the remote temperature sense.
NPN transistors must be diode-connected. PNP
transistors
can
either
be
transistoror
diode-connected, as Figure 18 and Figure 19 show.
Errors in remote temperature sensor readings are
typically the consequence of the ideality factor and
current excitation used by the TMP512/13 versus the
manufacturer-specified operating current for a given
transistor. Some manufacturers specify a high-level
and low-level current for the temperature-sensing
substrate transistors. The TMP512/13 use 6mA for
ILOW and 120mA for IHIGH.
The ideality factor (n) is a measured characteristic of
a remote temperature sensor diode as compared to
an ideal diode. The TMP512/13 allow for different
n-factor values; see the n-Factor Correction Register
section.
The ideality factor for the TMP512/13 is trimmed to
be 1.008. For transistors that have an ideality factor
that does not match the TMP512/13, Equation 4 can
be used to calculate the temperature error. Note that
for the equation to be used correctly, actual
temperature (°C) must be converted to kelvins (K).
(
(
TERR =
n - 1.008
´ 273.15 + T(°C)
1.008
space
(4)
TERR = 1.48°C
(5)
If a discrete transistor is used as the remote
temperature sensor with the TMP512/13, the best
accuracy can be achieved by selecting the transistor
according to the following criteria:
1. Base-emitter voltage > 0.25V at 6mA, at the
highest sensed temperature.
2. Base-emitter voltage < 0.95V at 120mA, at the
lowest sensed temperature.
3. Base resistance < 100Ω.
4. Tight control of VBE characteristics indicated by
small variations in hFE (that is, 50 to 150).
Based on these criteria, two recommended
small-signal transistors are the 2N3904 (NPN) or
2N3906 (PNP).
BASIC ADC FUNCTIONS
The two analog inputs to the TMP512/13, VIN+ and
VIN–, connect to a shunt resistor in the bus of interest.
The TMP512/13 are powered by an internal
subregulator, which has a typical output of 3.3V. The
bus being sensed can vary from 0V to 26V. There are
no
special
considerations
for
power-supply
sequencing (for example, a bus voltage can be
present with the supply voltage off, and vice-versa).
The TMP512/13 sense the small drop across the
shunt for shunt voltage, and sense the voltage with
respect to ground from VIN– for the bus voltage. See
Figure 27 for an illustration of this operation.
When the TMP512/13 are in the normal operating
mode (that is, MODE bits of Configuration Register 1
are set to '111'), the devices continuously convert the
shunt voltage up to the number set in the shunt
voltage averaging function (Configuration Register 1,
SADC bits). The devices then convert the bus voltage
up to the number set in the bus voltage averaging
(Configuration Register 1, BADC bits). The Mode
control in Configuration Register 1 also permits
selecting modes to convert only voltage or current,
either continuously or in response to a two-wire
command.
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TMP512
TMP513
MUX
DXP1
Low-Pass Filter
DXN1
ADC
DXP2
DXN2
DXP3
Internal
Diode
Temperature
Sensor
DXN3
V+
Subregulator
3.3V
Filter C
3.3V Supply
´
VSHUNT = VIN+ - VINTypically < 50mV
VIN-
ALERT
SDA
Two-Wire
Interface
Current Register
VIN+
Current
Shunt
A0
Power Register
ADC
SMBus
Controller
SCL
Voltage Register
Load
GPIO
VBUS = VIN- - GND
Range of 0V to 26V
Typical Application: 12V
GND
Figure 27. TMP512/13 Configured for Shunt and Bus Voltage Measurement
All current and power calculations are performed in
the background and do not contribute to conversion
time; conversion times shown in the Electrical
Characteristics table can be used to determine the
actual conversion time.
Power-Down mode reduces the quiescent current
and turns off current into the TMP512/13 inputs,
avoiding any supply drain. Full recovery from
Power-Down requires 40ms. ADC Off mode (set by
Configuration Register 1, MODE bits) stops all
conversions.
Although the TMP512/13 can be read at any time,
and the data from the last conversion remain
available, the Conversion Ready bit and the
Conversion Ready Temperature bit (Status Register,
CVR and CRT) are provided to help co-ordinate
one-shot or triggered conversions. The Conversion
Ready bit and the Conversion Ready Temperature bit
are set after all conversions, averaging, and
multiplication operations are complete.
22
The Conversion Ready bit and the Conversion Ready
Temperature bit clear when reading the Status
Register or triggering a single-shot conversion.
POWER MEASUREMENT
Current and bus voltage are converted at different
points in time, depending on the resolution and
averaging mode settings. For instance, when
configured for 12-bit and 128 sample averaging, up to
81ms in time between sampling these two values is
possible. Again, these calculations are performed in
the background and do not add to the overall
conversion time.
PGA FUNCTION
If larger full-scale shunt voltages are desired, the
TMP512/13 provide a PGA function that increases
the full-scale range up to 2, 4, or 8 times (320mV).
Additionally, the bus voltage measurement has two
full-scale ranges: 16V or 32V.
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COMPATIBILITY WITH TI HOT-SWAP
CONTROLLERS
The TMP512/13 are designed for compatibility with
hot-swap controllers such the TI TPS2490. The
TPS2490 uses a high-side shunt with a limit at 50mV;
the TMP512/13 full-scale range of 40mV enables the
use of the same shunt for current sensing below this
limit. When sensing is required at (or through) the
50mV sense point of the TPS2490, the PGA of the
TMP512/13 can be set to ÷2 to provide an 80mV
full-scale range.
FILTERING AND INPUT CONSIDERATIONS
Measuring current is often noisy, and such noise can
be difficult to define. The TMP512/13 offer several
options for filtering by choosing resolution and
averaging in Configuration Register 1. These filtering
options can be set independently for either voltage or
current measurement.
The internal ADC is based on a delta-sigma (ΔΣ)
front-end with a 500kHz (±10%) typical sampling rate.
This architecture has good inherent noise rejection;
however, transients that occur at or very close to the
sampling rate harmonics can cause problems.
Because these signals are at 1MHz and higher, they
can be dealt with by incorporating filtering at the input
of the TMP512/13. The high frequency enables the
use of low-value series resistors on the filter for
negligible effects on measurement accuracy.
Figure 28 shows the TMP512/13 with an additional
filter added at the input.
Overload conditions are another consideration for the
TMP512/13 inputs. The TMP512/13 inputs are
specified to tolerate 26V across the inputs. A large
differential scenario might be a short to ground on the
load side of the shunt. This type of event can result in
full power-supply voltage across the shunt (as long
the power supply or energy storage capacitors
support it). It must be remembered that removing a
short to ground can result in inductive kickbacks that
could exceed the 26V differential and common-mode
rating of the TMP512/13. Inductive kickback voltages
are best dealt with by zener-type transient-absorbing
devices (commonly called transzorbs) combined with
sufficient energy storage capacitance.
TMP512
TMP513
MUX
DXP1
Low-Pass Filter
DXN1
ADC
DXP2
DXN2
DXP3
Internal
Diode
Temperature
Sensor
DXN3
V+
Subregulator
3.3V
Filter C
3.3V Supply
´
A0
Power Register
10W
Current
Shunt
VIN-
Two-Wire
Interface
Current Register
VIN+
ADC
ALERT
SDA
SMBus
Controller
SCL
Voltage Register
10W
Load
0.1mF to 1mF
Ceramic Capacitor
GND
GPIO
Figure 28. TMP512/13 with Input Filtering
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In applications that do not have large energy storage
electrolytics on one or both sides of the shunt, an
input overstress condition may result from an
excessive dV/dt of the voltage applied to the input. A
hard physical short is the most likely cause of this
event, particularly in applications with no large
electrolytics present. This problem occurs because an
excessive dV/dt can activate the ESD protection in
the TMP512/13 in systems where large currents are
available. Testing has demonstrated that the addition
of 10Ω resistors in series with each input of the
TMP512/13 sufficiently protects the inputs against
dV/dt failure up to the 26V rating of the TMP512/13.
These resistors have no significant effect on
accuracy.
not generate an Acknowledge and continues to hold
the ALERT line low until the interrupt is cleared.
Successful completion of the read alert response
protocol clears the SMBus ALERT pin, provided that
the condition causing the alert no longer exists. The
SMBus Alert flag is cleared separately by either
reading the Status Register or by disabling the
SMBus Alert function.
SMBus ALERT RESPONSE
The TMP512/13 GPIO can be used to control an
external circuit to switch the VBUS measurement to an
alternate location. Switching is most often done to
perform bus voltage measurements on the opposite
side of a MOSFET switch in series with the shunt
resistor.
The SMBus alert response functions only when the
Alert pin is active and in latch mode (03h, bit 0 = 1);
see Figure 24. The ALERT interrupt output signal is
latched and can be cleared only by either reading the
Status Register or by successfully responding to an
alert response address. If the fault is still present, the
ALERT pin re-asserts. Asserting the ALERT pin does
not halt automatic conversions that are already in
progress. The ALERT output pin is open-drain,
allowing multiple devices to share a common interrupt
line.
The TMP512/13 respond to the SMBus alert
response address, an interrupt pointer return-address
feature. The SMBus alert response interrupt pointer
provides quick fault identification for simple slave
devices. When an ALERT occurs, the master can
broadcast the alert response slave address (0001
100). Following this alert response, any slave devices
that generated interrupts identify themselves by
putting the respective addresses on the bus.
The alert response can activate several different
slave devices simultaneously, similar to the two-wire
General Call. If more than one slave attempts to
respond, bus arbitration rules apply; the device with
the lower address code wins. The losing device does
24
The Status Register flags indicate which (if any) of
the watchdogs have been activated. After power-on
reset (POR), the normal state of all flag bits is '0',
assuming that no alarm conditions exist.
EXTERNAL CIRCUITRY FOR ADDITIONAL
VBUS INPUT
Consideration must be given to the typical 20mA input
current of each TMP512/13 input, along with the
320kΩ impedance present at the VIN– input where the
bus voltage is measured. These effects can create
errors through the resistance of any external
switching method used. The easiest way to avoid
these errors is by reducing this resistance to a
minimum; select switching MOSFETs with the lowest
possible RDS(on) values.
The circuit shown in Figure 29 uses MOSFET pairs to
reduce package count. Back-to-back MOSFETs must
be used in each leg because of the built-in back
diodes from source-to-drain. In this circuit, the normal
connection for VIN– is at the shunt, with the optional
voltage measurement at the output of the control
FET.
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TMP512
TMP513
MUX
DXP1
Low-Pass Filter
DXN1
ADC
DXP2
DXN2
DXP3
Internal
Diode
Temperature
Sensor
DXN3
V+
Subregulator
3.3V
Filter C
3.3V Supply
´
Current Register
VIN+
Shunt
RSHUNT
A0
Power Register
Two-Wire
Interface
ADC
VIN-
ALERT
SDA
SMBus
Controller
SCL
Voltage Register
GPIO
GND
10kW
Control
FET
N-Channel MOSFETs
Dual pairs such as Vishay SI1034
P-Channel MOSFETs
Dual pairs such as
Vishay SI3991DV
10kW
Load From
Hot-Swap
Controller
N-Channel MOSFETs
Dual pairs such as Vishay SI1034
Figure 29. External Circuitry for Additional VBUS Input
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PROGRAMMING THE TMP512/13 POWER MEASUREMENT ENGINE
Calibration Register and Scaling
The Calibration Register makes it possible to set the scaling of the Current and Power Registers to whatever
values are most useful for a given application. One strategy may be to set the Calibration Register such that the
largest possible number is generated in the Current Register or Power Register at the expected full-scale point;
this approach yields the highest resolution. The Calibration Register can also be selected to provide values in the
Current and Power Registers that either provide direct decimal equivalents of the values being measured, or
yield a round LSB number. After these choices have been made, the Calibration Register also offers possibilities
for end user system-level calibration, where the value is adjusted slightly to cancel total system error.
This section presents two examples for configuring the TMP512/13 calibration. Both examples are written so the
information relates directly to the calibration setup found in the TMP512/13EVM software.
Calibration Example 1: Calibrating the TMP512/13 with no possibility for overflow.
NOTE
The numbers used in this example are the same used with the TMP512/13EVM software
as shown in Figure 30.
1. Establish the following parameters:
VBUS_MAX = 32
VSHUNT_MAX = 0.32
RSHUNT = 0.5
2. Use Equation 6 to determine the maximum possible current .
VSHUNT_MAX
MaxPossible_I =
RSHUNT
MaxPossible_I = 0.64
(6)
3. Choose the desired maximum current value. This value is selected based on system expectations.
Max_Expected_I = 0.6
4. Calculate the possible range of current LSBs. To calculate this range, first compute a range of LSBs that is
appropriate for the design. Next, select an LSB within this range. Note that the results will have the most
resolution when the minimum LSB is selected. Typically, an LSB is selected to be the nearest round number
to the minimum LSB value.
Max_Expected_I
Minimum_LSB =
32767
Minimum_LSB = 18.311 ´ 10-6
(7)
Max_Expected_I
4095
Maximum_LSB = 146.520 ´ 10-6
Maximum_LSB =
(8)
Choose an LSB in the range: Minimum_LSB < Selected_LSB < Maximum_LSB
Current_LSB = 20 × 10–6
Note:
This value was selected to be a round number near the Minimum_LSB. This selection allows for
good resolution with a rounded LSB.
5. Compute the Calibration Register value using Equation 9:
0.04096
Cal = trunc Current_LSB ´ R
SHUNT
Cal = 4096
26
(9)
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6. Calculate the Power LSB with Equation 10. Equation 10 shows a general formula; because the bus voltage
measurement LSB is always 4mV, the power formula reduces to the calculated result.
Power_LSB = 20 Current_LSB
Power_LSB = 400 ´ 10-6
(10)
7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 11 and
Equation 12. Note that both Equation 11 and Equation 12 involve an If - then condition:
Max_Current = Current_LSB ´ 32767
Max_Current = 0.65534
(11)
If Max_Current ≥ MaxPossible_I then
Max_Current_Before_Overflow = MaxPossible_I
Else
Max_Current_Before_Overflow = Max_Current
End If
(Note that Max_Current is greater than MaxPossible_I in this example.)
Max_Current_Before_Overflow = 0.64
Max_ShuntVoltage = Max_Current_Before_Overflow ´ RSHUNT
Max_ShuntVoltage = 0.32
(12)
If Max_ShuntVoltage ≥ VSHUNT_MAX
Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX
Else
Max_ShuntVoltage_Before_Overflow= Max_ShuntVoltage
End If
(Note that Max_ShuntVoltage is greater than VSHUNT_MAX in this example.)
Max_ShuntVoltage_Before_Overflow = 0.32
8. Compute the maximum power with Equation 13.
MaximumPower = Max_Current_Before_Overflow ´ VBUS_MAX
MaximumPower = 20.48
(13)
9. (Optional second Calibration step.) Compute corrected full-scale calibration value based on measured
current.
TMP513_Current = 0.63484
MeaShuntCurrent = 0.55
Corrected_Full_Scale_Cal = trunc
Cal ´ MeasShuntCurrent
TMP513_Current
Corrected_Full_Scale_Cal = 3548
(14)
Figure 30 illustrates how to perform the same procedure discussed in this example using the automated
TMP512/13EVM software. Note that the same numbers used in this nine-step example are used in the software
example. Note also that Figure 30 illustrates which results correspond to which step (for example, the information
entered in Step 1 is enclosed in a box in Figure 30 and labeled).
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Figure 30. TMP512/513EVM Calibration Software Automatically Computes Calibration Steps 1-9
28
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Calibration Example 2 (Overflow Possible)
This design example uses the nine-step procedure for calibrating the TMP512/13 where overflow is possible.
Figure 31 illustrates how the same procedure is performed using the automated TMP512/13EVN software. The
same numbers used in the nine-step example are used in the software example shown in Figure 31. Note also
that Figure 31 illustrates which results correspond to which step (for example, the information entered in Step 1
is circled in Figure 31 and labeled).
1. Establish the following parameters:
VBUS_MAX = 32
VSHUNT_MAX = 0.32
RSHUNT = 5
2. Determine the maximum possible current using Equation 15:
VSHUNT_MAX
MaxPossible_I =
RSHUNT
MaxPossible_I = 0.064
(15)
3. Choose the desired maximum current value: Max_Expected_I, ≤ MaxPossible_I. This value is selected
based on system expectations.
Max_Expected_I = 0.06
4. Calculate the possible range of current LSBs. This calculation is done by first computing a range of LSB's
that is appropriate for the design. Next, select an LSB withing this range. Note that the results will have the
most resolution when the minimum LSB is selected. Typically, an LSB is selected to be the nearest round
number to the minimum LSB.
Max_Expected_I
Minimum_LSB =
32767
Minimum_LSB = 1.831 ´ 10-6
(16)
Max_Expected_I
4095
Maximum_LSB = 14.652 ´ 10-6
Maximum_LSB =
(17)
Choose an LSB in the range: Minimum_LSB < Selected_LSB < Maximum_LSB
Current_LSB = 1.9 × 10–6
Note:
This value was selected to be a round number near the Minimum_LSB. This section allows for good
resolution with a rounded LSB.
5. Compute the calibration register using Equation 18:
Cal = trunc
0.04096
Current_LSB ´ RSHUNT
Cal = 4311
(18)
6. Calculate the Power LSB using Equation 19. Equation 19 shows a general formula; because the bus voltage
measurement LSB is always 4mV, the power formula reduces to calculate the result.
Power_LSB = 20 Current_LSB
Power_LSB = 38 ´ 10-6
(19)
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7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 20 and
Equation 21. Note that both Equation 20 and Equation 21 involve an If - then condition.
Max_Current = Current_LSB ´ 32767
Max_Current = 0.06226
(20)
If Max_Current ≥ MaxPossible_I then
Max_Current_Before_Overflow = MaxPossible_I
Else
Max_Current_Before_Overflow = Max_Current
End If
(Note that Max_Current is less than MaxPossible_I in this example.)
Max_Current_Before_Overflow = 0.06226
Max_ShuntVoltage = Max_Current_Before_Overflow ´ RSHUNT
Max_ShuntVoltage = 0.3113
(21)
If Max_ShuntVoltage ≥ VSHUNT_MAX
Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX
Else
Max_ShuntVoltage_Before_Overflow= Max_ShuntVoltage
End If
(Note that Max_ShuntVoltage is less than VSHUNT_MAX in this example.)
Max_ShuntVoltage_Before_Overflow = 0.3113
8. Compute the maximum power with Equation 22.
MaximumPower = Max_Current_Before_Overflow ´ VBUS_MAX
MaximumPower = 1.992
(22)
9. (Optional second calibration step.) Compute the corrected full-scale calibration value based on measured
current.
TMP513_Current = 0.06226
MeaShuntCurrent = 0.05
Corrected_Full_Scale_Cal = trunc
Cal ´ MeasShuntCurrent
TMP513_Current
Corrected_Full_Scale_Cal = 3462
30
(23)
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Figure 31. TMP512/513EVM Calibration Software Automatically Computes Calibration Steps 1-9
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REGISTER INFORMATION
The TMP512/13 uses a bank of registers for holding
configuration
settings,
measurement
results,
maximum/minimum limits, and status information.
Table 3 summarizes the TMP512/13 registers.
Register contents are updated 4ms after completion of
the write command. Therefore, a 4ms delay is
required between the completion of a write to a given
register and a subsequent read of that register
(without changing the pointer) when using SCL
frequencies in excess of 1MHz.
Table 3. Summary of Register Set
POINTER
ADDRESS
(1)
(2)
(3)
32
POWER-ON RESET
HEX
REGISTER NAME
FUNCTION
BINARY
HEX
TYPE (1)
00
Configuration Register 1
All-register reset, settings for bus voltage range, PGA Gain, Bus
ADC resolution/averaging, Shunt ADC resolution/averaging,
one-shot, Operation Mode.
00111001 10011111
399F
R/W
01
Configuration Register 2
TMP512
Settings for Temperature Continuous conversion, Remote
Channels enable, Local Channel enable, resistance correction
enable, Conversion rate bits, and GPIO mode bit and readback.
1011111110000x00
BF80/BF84
R/W
01
Configuration Register 2
TMP513
Settings for Temperature Continuous conversion, Remote
Channels enable, Local Channel enable, resistance correction
enable, Conversion rate bits, and GPIO mode bit and readback.
11111111 10000x00
FF80/FF84
R/W
Contains the alert and conversion ready flags.
00000000 00000000
0000
R
Contains masks to enable/disable the alert functions.
00000000 00000000
0000
R/W
Shunt voltage measurement result.
00000000 00000000
0000
R
Bus voltage measurement result.
00000000 00000000
0000
R
Power measurement result.
00000000 00000000
0000
R
Contains the value of the current flowing through the shunt
resistor.
00000000 00000000
0000
R
02
Status Register
03
SMBus Alert Mask/Enable
Control Register
04
Shunt Voltage Result
05
Bus Voltage Result
06
Power Result
07
Shunt Current Result (2)
08
Local Temperature Result
Contains local temperature measurement result.
00000000 00000000
0000
R
09
Remote Temperature
Result 1
Contains remote temperature measurement result.
00000000 00000000
0000
R
0A
Remote Temperature
Result 2
Contains remote temperature measurement result.
00000000 00000000
0000
R
0B (3)
Remote Temperature
Result 3
Contains remote temperature measurement result.
00000000 00000000
0000
R
0C
Shunt Voltage Positive
Limit
Contains the positive limit for Shunt Voltage.
00000000 00000000
0000
R/W
0D
Shunt Voltage Negative
Limit
Contains the negative limit for Shunt Voltage.
00000000 00000000
0000
R/W
Contains the positive limit for Bus Voltage.
00000000 00000000
0000
R/W
00000000 00000000
0000
R/W
Contains the positive limit for Power.
00000000 00000000
0000
R/W
Contains positive limit for local temperature.
00101010 10000000
2A80
R/W
0E
Bus Voltage Positive Limit
0F
Bus Voltage Negative Limit Contains the negative limit for Bus Voltage.
10
Power Limit
11
Local Temperature Limit
Type: R = Read-Only, R/W = Read/Write.
Current Register defaults to '0' because the Calibration Register defaults to '0', yielding a zero current value until the Calibration Register
is programmed.
For TMP513 only.
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Table 3. Summary of Register Set (continued)
POINTER
ADDRESS
POWER-ON RESET
BINARY
HEX
TYPE (1)
Contains positive limit for remote temperature.
00101010 10000000
2A80
R/W
Remote Temperature
Limit 2
Contains positive limit for remote temperature.
00101010 10000000
2A80
R/W
14 (4)
Remote Temperature
Limit 3
Contains positive limit for remote temperature.
00101010 10000000
2A80
R/W
15
Shunt Calibration Register
Sets the current that corresponds to a full-scale drop across the
shunt.
00000000 00000000
0000
R/W
16
n-Factor 1
Contains the N-factor value for Remote Channel 1 and
Hysteresis for temperature limits.
00000000 00000000
0000
R/W
HEX
REGISTER NAME
12
Remote Temperature
Limit 1
13
FUNCTION
17
n-Factor 2
Contains the N-factor value for Remote Channel 2.
00000000 00000000
0000
R/W
18 (4)
n-Factor 3
Contains the N-factor value for Remote Channel 3.
00000000 00000000
0000
R/W
1E/FE
Manufacturer ID Register
Contains the Manufacturer ID.
01010101 11111111
55FF
R
1F/FF
TMP512 Device ID
Register
Contains the Device ID.
00100010 11111111
22FF
R
1F/FF
TMP513 Device ID
Register
Contains the Device ID.
00100011 11111111
23FF
R
(4)
For TMP513 only.
space
space
REGISTER DETAILS
All TMP512/13 registers are 16-bit registers. 16-bit register data are sent in two 8-bit bytes via the two-wire
interface.
Configuration Register 1—Shunt Measurement Configuration 00h (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
RST
ONESHOT
BRNG
PG1
PG0
BADC4
BADC3
BADC2
BADC1
SADC4
SADC3
SADC2
SADC1
MODE3
MODE2
MODE1
POR
VALUE
0
0
1
1
1
0
0
1
1
0
0
1
1
1
1
1
Bit Descriptions
RST:
Reset Bit
Bit 15
Setting this bit to '1' generates a system reset that is the same as power-on reset. Resets all registers to default
values; this bit self-clears.
ONE-SHOT
One-Shot Bit
Bit 14
Setting this bit to '1' generates a one-shot command.
BRNG:
Bus Voltage Range
Bit 13
0 = 16V FSR
1 = 32V FSR (default value)
PG:
PGA (Shunt Voltage Only)
Bits 12, 11
Sets PGA gain and range. Note that the PGA defaults to ÷8 (320mV range). Table 4 shows the gain and range for
the various product gain settings.
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Table 4. PG Bit Settings (1)
(1)
PG1
PG0
GAIN
RANGE
0
0
1
±40mV
0
1
÷2
±80mV
1
0
÷4
±160mV
1
1
÷8
±320mV
Shaded values are default.
BADC:
BADC Bus ADC Resolution/Averaging
Bits 10–7
These bits adjust the Bus ADC resolution (9-, 10-, 11-, or 12-bit) or set the number of samples used when
averaging results for the Bus Voltage Register (05h).
SADC:
SADC Shunt ADC Resolution/Averaging
Bits 6–3
These bits adjust the Shunt ADC resolution (9-, 10-, 11-, or 12-bit) or set the number of samples used when
averaging results for the Shunt Voltage Register (04h).
BADC (Bus) and SADC (Shunt) ADC resolution/averaging and conversion time settings are shown in Table 5.
Table 5. ADC Settings (1)
(1)
(2)
ADC4
ADC3
ADC2
ADC1
MODE/SAMPLES
CONVERSION TIME
0
X (2)
0
0
9-bit
105ms
0
X (2)
0
1
10-bit
185ms
0
X (2)
1
0
11-bit
345ms
0
X (2)
1
1
12-bit
665ms
1
0
0
0
12-bit
665ms
1
0
0
1
2
1.3ms
1
0
1
0
4
2.58ms
1
0
1
1
8
5.13ms
1
1
0
0
16
10.25ms
1
1
0
1
32
20.49ms
1
1
1
0
64
40.97ms
1
1
1
1
128
81.92ms
Shaded values are default.
X = Don't care.
MODE:
Operating Mode
Bits 2–0
Selects continuous, triggered, or power-down mode of operation. These bits default to continuous shunt and bus
measurement mode. The mode settings are shown in Table 6.
Table 6. Mode Settings (1)
(1)
(2)
(3)
(4)
34
MODE3
MODE2
MODE1
MODE
0
0
0
Power-Down (2)
0
0
1
Shunt Voltage, Triggered (3)
0
1
0
Bus Voltage, Triggered (3)
0
1
1
Shunt and Bus, Triggered (3)
1
0
0
ADC Off (disabled) (4)
1
0
1
Shunt Voltage, Continuous
1
1
0
Bus Voltage, Continuous
1
1
1
Shunt and Bus, Continuous
Shaded values are default.
Combination '000' stops converter immediately.
In triggered modes the converter goes to power down. It can be triggered by a write of '1' to bit 14
(One-Shot) in Configuration Register 1 or by the delay scheme of the temperature sensor core. See
Table 7.
Combination '100' stops the converter at conversion end.
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Configuration Register 2—Temperature Measurement Configuration 01h (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
CONT
REN3
REN2
REN1
LEN
RC
R2
R1
R0
—
—
—
—
GP
GPM1
GPM0
TMP512
POR
VALUE
1
0
1
1
1
1
1
1
1
0
0
0
0
X
0
0
TMP513
POR
VALUE
1
1
1
1
1
1
1
1
1
0
0
0
0
X
0
0
CONT:
Continuous Conversion
Bit 15
0: When all bits 14 to 11 are '0', the temp sensor core goes immediately to shutdown mode. When all bits 14 to 11
are not '0', the temp sensor core stops when all enabled conversions are done. When this bit is '0', a one-shot
command can be triggered by writing a "1" to bit 14 of Configuration Register 1.
1: Continuous temperature conversion mode.
REN3:
Remote Channel 3 Enable (TMP513 only)
Bit 14
0: Remote channel 3 disabled.
1: Remote channel 3 enabled.
REN2:
Remote Channel 2 Enable
Bit 13
0: Remote channel 2 disabled.
1: Remote channel 2 enabled.
REN1:
Remote Channel 1 Enable
Bit 12
0: Remote channel 1 disabled.
1: Remote channel 1 enabled.
LEN:
Local Temperature Enable
Bit 11
0: Local temperature disabled.
1: Local temperature enabled.
RC:
Resistance Correction
Bit 10
0: Resistance correction disabled.
1: Resistance correction enabled.
R2, R1, R0:
Conversion Rate
Bits 9-7
These bits set the conversion rate as shown in Table 7.
Table 7. Conversion Rate Settings (1)
(1)
(2)
(3)
R2
R1
R0
CONVERSIONS/SEC
0
0
0
0.0625
0
0
1
0.125
0
1
0
0.25
0
1
1
0.5
1
0
0
1
1
0
1
2
1
1
0
4 (2)
1
1
1
8 (3)
Shaded values are default.
Conversion rate shown is for only one or two enabled measurement channels. When three channels
are enabled, the conversion rate is 2 and 2/3 conversions per second. When four channels are
enabled, the conversion rate is 2 per second.
Conversion rate shown is for only one enabled measurement channel. When two channels are
enabled, the conversion rate is 4 conversions per second. When three channels are enabled, the
conversion rate is 2 and 2/3 conversions per second.
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•
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When all of the following conditions are met, the temperature sensor core triggers a single conversion of the
voltage measurement core at the same rate as the conversion rate shown by bits R2 to R0.
The conversion rate is different than '111';
There is at least one enabled temperature channel; and
The voltage measurement core is in triggered mode of operation.
The temperature sensor core triggers a single conversion of the ADC core at the same rate as the conversion
rate shown by R2 to R0.
GP:
GPIO Read-Back
Bit 2
Shows the state of the GPIO pin.
GPM:
GPIO Mode
Bits 1-0
The GPIO mode settings are shown in Table 8. GPIO should not be left floating at start-up.
Table 8. GPIO Mode Settings (1)
(1)
36
GPM[1]
GPM[0]
GPIO PIN
DESCRIPTION
0
0
Hi-Z
0
1
Hi-Z
Use as an input for either of these
modes.
1
0
0
Use to output 0 to GPIO pin
1
1
1
Use to output 1 to GPIO pin
Shaded values are default.
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Status Register 02h (Read)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SHP
SHN
BVP
BVN
PWR
LCL
RM1
RM2
RM3
CVR
CRT
PVLD
SMBA
OVF
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The Status Register flags activate whenever any limit is violated, and latch if the alert is in latch mode. In latch
mode, these flags are cleared when the Status Register is read (if the limit is exceeded, then at next conversion
end, the flag sets again). In transparent mode, these flags are cleared when any corresponding limit is not
violated any longer.
After power-up and initial setup, the Status Register should be read once to clear any flags set as a result of
power-up values prior to setup.
Bit Descriptions
SHP:
Shunt Positive Over-Voltage
Bit 15
This bit is set to '1' when the result in the Shunt Voltage Register (04h) exceeds the level set in the Shunt Positive
Limit Register (0Ch).
SHN:
Shunt Negative Under-Voltage
Bit 14
This bit is set to '1' when the result in the Shunt Voltage Register (04h) goes below the level set in the Shunt
Negative Limit Register (0Dh).
BVP:
Bus Positive Over-Voltage
Bit 13
This bit is set to '1' when the result in the Bus Voltage Register (05h) exceeds the level set in the Bus Voltage
Positive Limit Register (0Eh).
BVN:
Bus Negative Under-Voltage
Bit 12
This bit is set to '1' when the result in the Bus Voltage Register (05h) goes below the level set in the Bus Voltage
Negative Limit Register (0Fh).
PWR:
Power Over–Limit
Bit 11
This bit is set to '1' when the result in the Power Register (06h) exceeds the level set in the Power Limit Register
(10h).
LCL:
Local Temperature Over-Limit
Bit 10
This bit is set to '1' when the result in the Local Temperature Result Register (08h) exceeds the level set in the
Local Temperature Limit Register (11h) plus half of the temperature hysteresis. It clears in transparent mode when
the result in the Local Temperature Result Register (08h) is below the level set in the Local Temperature Limit
Register (11h) minus half of the temperature hysteresis.
RM1:
Remote Temperature 1 Over-Limit
Bit 9
This bit is set to '1' when the result in the Remote Temperature Result 1 Register (09h) exceeds the level set in the
Remote Temperature Limit 1 Register (12h) plus half of the temperature hysteresis. It also sets if, during conversion
of remote channel 1, an open diode condition was detected. It clears in transparent mode when the result in the
Remote Temperature Result 1 Register (09h) is below the level set in the Remote Temperature Limit 1 Register
(12h) minus half of the temperature hysteresis, and the last conversion of channel 1 was done without open-diode
detection.
RM2:
Remote Temperature 2 Over-Limit
Bit 8
This bit is set to '1' when the result in the Remote Temperature Result 2 Register (0Ah) exceeds the level set in the
Remote Temperature Limit 2 Register (13h) plus half of the temperature hysteresis. It also sets if, during conversion
of remote channel 2, an open diode condition was detected. It clears in transparent mode when the result in the
Remote Temperature Result 2 Register (0Ah) is below the level set in the Remote Temperature Limit 2 Register
(13h) minus half of the temperature hysteresis, and the last conversion of channel 2 was done without open-diode
detection.
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Bit Descriptions (continued)
RM3:
Remote Temperature 3 Over-Limit (TMP513 only)
Bit 7
This bit is set to '1' when the result in the Remote Temperature Result 3 Register (0Bh) exceeds the level set in the
Remote Temperature Limit 3 Register (14h) plus half of the temperature hysteresis. It sets also if during conversion
of remote channel 3 an open diode condition was detected. It clears in transparent mode when the result in the
Remote Temperature Result 3Register (0Bh) is below the level set in the Remote Temperature Limit 3 Register
(14h) minus half of the temperature hysteresis and the last conversion of channel 3 was done without open-diode
detection.
CVR:
Conversion Ready
Bit 6
The Conversion Ready line is provided to help coordinate one-shot conversions for shunt voltage, bus voltage,
current and power measurements. The Conversion bit is set after all conversions, averaging, and multiplication
events are complete. Conversion Ready clears under the following conditions:
1. Writing to the One-Shot bit in Configuration Register 1.
2. Reading the Status Register.
CRT:
Conversion Ready Temperature
Bit 5
The Conversion Ready Temperature line is provided to help coordinate one-shot conversions for local and remote
temperature measurements. The Conversion bit is set after all enabled channels complete the respective
conversions. Conversion Ready Temperature clears under the following conditions:
1.
2.
Writing to the One-Shot bit in Configuration Register 1.
Reading the Status Register.
PVLD:
Power Valid Error
Bit 4
In latch mode, this bit is set to '1' when the brown-out detect fires during a conversion. The flag sets to '1' at the
conversion end. It clears by reading the Status Register.
SMBA:
SMBus Alert
Bit 3
This bit is set when the Alert pin is active. When in latch mode, it clears only on reading the Status Register,
disabling the SMBus Alert function, or using SMBus Alert Response. In transparent mode, it clears when the
triggering condition is not present.
OVF:
Math Overflow
Bit 2
This bit is set to '1' if an arithmetic operation resulted in an overflow error. It indicates that current and power data
may be meaningless. It does not set the Alert pin.
38
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SMBus Alert Register—Mask and Alert Control Functions 03h (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SHPM
SHNM
BVPM
BVNM
PWRM
LCLM
R1M
R2M
R3M
CVRM
CRTM
PVLM
FC1
FC0
POL
LATCH
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits D4–D15 of the SMBus Alert Register mask correspond to bits D4 to D15 of the Status Register to prevent
them from initiating an SMBus Alert. It does not prevent the Status Register bit from setting. Writing a '0' to an
SMBus Alert Mask bit masks it from activating the SMBus Alert. All default values are '0'.
Bit Descriptions
SHPM:
Shunt Positive Over-Voltage Mask
Bit 15
0: SHP flag in Status Register cannot activate Alert pin.
1: SHP flag (when set to '1') in Status Register activates Alert pin.
SHNM:
Shunt Negative Under-Voltage Mask
Bit 14
0: SHN flag in Status Register cannot activate Alert pin.
1: SHN flag (when set to '1') in Status Register activates Alert pin.
BVPM:
Bus Voltage Positive Over-Voltage Mask
Bit 13
0: BVP flag in Status Register cannot activate Alert pin.
1: BVP flag (when set to '1') in Status Register activates Alert pin.
BVNM:
Bus Voltage Negative Under-Voltage Mask
Bit 12
0: BVN flag in Status Register cannot activate Alert pin.
1: BVN flag (when set to '1') in Status Register activates Alert pin.
PWRM:
Power Over-Limit Mask
Bit 11
0: PWR flag in Status Register cannot activate Alert pin.
1: PWR flag (when set to '1') in Status Register activates Alert pin.
LCLM:
Local Temperature Over-Limit Mask
Bit 10
0: LCL flag in Status Register cannot activate Alert pin.
1: LCL flag (when set to '1') in Status Register activates Alert pin.
R1M:
Remote Temperature1 Over-Limit Mask
Bit 9
0: RM1 flag in Status Register cannot activate Alert pin.
1: RM1 flag (when set to '1') in Status Register activates Alert pin.
R2M:
Remote Temperature2 Over-Limit Mask
Bit 8
0: RM2 flag in Status Register cannot activate Alert pin.
1: RM2 flag (when set to '1') in Status Register activates Alert pin.
R3M:
Remote Temperature3 Over-Limit Mask (TMP513 only)
Bit 7
0: RM3 flag in Status Register cannot activate Alert pin.
1: RM3 flag (when set to '1') in Status Register activates Alert pin.
CVRM:
Conversion Ready Mask
Bit 6
0: CVR flag in Status Register cannot activate Alert pin.
1: CVR flag (when set to '1') in Status Register activates Alert pin.
CRTM:
Conversion Ready Temperature Mask
Bit 5
0: CRT flag in Status Register cannot activate Alert pin.
1: CRT flag (when set to '1') in Status Register activates Alert pin.
PVLM:
Power Valid Limit Mask
Bit 4
0: PVLD flag in Status Register cannot activate Alert pin.
1: PVLD flag (when set to '1') in Status Register activates Alert pin.
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Bit Descriptions (continued)
FC0, FC1
Fault Count Control Bits
The Fault Count Control Bits affect flags in SMBus Alert Register bits D15-D7.
Bit 3, 2
00: These flags are activated after the first conversion result with a violated limit.
01: These flags are activated after the second consecutive conversion result with a violated limit.
10: These flags are activated after the fourth consecutive conversion result with a violated limit.
11: These flags are activated after the eighth consecutive conversion result with a violated limit.
POL:
Alert Polarity
Bit 1
0: Alert pin is active low.
1: Alert pin is active high.
LATCH:
Alert Mode of Operation
Bit 0
0: Alert pin works in transparent mode. The SMB alert response function does not function. Alert is deasserted
when the triggering condition goes away.
1: Alert pin works in latch mode. The SMB alert response function functions when Alert pin is active. Alert will
remain asserted even if the triggering condition goes away. Alert can be deasserted by reading the Status register
(02h), using the SMBus Alert response function, resetting the part, or by disabling the alert function using the mask
bits.
40
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Shunt Voltage Register 04h (Read-Only)
The Shunt Voltage Register stores the current shunt voltage reading, VSHUNT. Shunt Voltage Register bits are
shifted according to the PGA setting selected in Configuration Register 1 (00h). When multiple sign bits are
present, they will all be the same value. Negative numbers are represented in twos complement format.
Generate the twos complement of a negative number by complementing the absolute value binary number and
adding 1. Extend the sign, denoting a negative number by setting the MSB = '1'. Extend the sign to any
additional sign bits to form the 16-bit word.
Example: For a value of VSHUNT = –320mV:
1. Take the absolute value (include accuracy to 0.01mV)==> 320.00
2. Translate this number to a whole decimal number ==> 32000
3. Convert it to binary==> 111 1101 0000 0000
4. Complement the binary result : 000 0010 1111 1111
5. Add 1 to the Complement to create the twos complement formatted result ==> 000 0011 0000 0000
6. Extend the sign and create the 16-bit word: 1000 0011 0000 0000 = 8300h (Remember to extend the sign to
all sign-bits, as necessary based on the PGA setting.)
At PGA = ÷8, full-scale range = ±320mV (decimal = 32000, positive value hex = 7D00, negative value hex =
8300), and LSB = 10mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SIGN
SD14_8
SD13_8
SD12_8
SD11_8
SD10_8
SD9_8
SD8_8
SD7_8
SD6_8
SD5_8
SD4_8
SD3_8
SD2_8
SD1_8
SD0_8
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
At PGA = ÷4, full-scale range = ±160mV (decimal = 16000, positive value hex = 3E80, negative value hex =
C180), and LSB = 10mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SIGN
SIGN
SD13_4
SD12_4
SD11_4
SD10_4
SD9_4
SD8_4
SD7_4
SD6_4
SD5_4
SD4_4
SD3_4
SD2_4
SD1_4
SD0_4
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
At PGA = ÷2, full-scale range = ±80mV (decimal = 8000, positive value hex = 1F40, negative value hex = E0C0),
and LSB = 10mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SIGN
SIGN
SIGN
SD12_2
SD11_2
SD10_2
SD9_2
SD8_2
SD7_2
SD6_2
SD5_2
SD4_2
SD3_2
SD2_2
SD1_2
SD0_2
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
At PGA = ÷1, full-scale range = ±40mV (decimal = 4000, positive value hex = 0FA0, negative value hex = F060),
and LSB = 10mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SIGN
SIGN
SIGN
SIGN
SD11_1
SD10_1
SD9_1
SD8_1
SD7_1
SD6_1
SD5_1
SD4_1
SD3_1
SD2_1
SD1_1
SD0_1
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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Table 9. Shunt Voltage Register Format (1)
VSHUNT
Reading (mV)
Decimal
Value
PGA = ÷ 8
(D15…..................D0)
PGA = ÷ 4
(D15…..................D0)
PGA = ÷ 2
(D15…..................D0)
PGA = ÷ 1
(D15…..................D0)
320.02
32002
0111 1101 0000 0000
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
320.01
32001
0111 1101 0000 0000
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
320.00
32000
0111 1101 0000 0000
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
319.99
31999
0111 1100 1111 1111
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
319.98
31998
0111 1100 1111 1110
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
160.02
16002
0011 1110 1000 0010
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
160.01
16001
0011 1110 1000 0001
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
160.00
16000
0011 1110 1000 0000
0011 1110 1000 0000
0001 1111 0100 0000
0000 1111 1010 0000
159.99
15999
0011 1110 0111 1111
0011 1110 0111 1111
0001 1111 0100 0000
0000 1111 1010 0000
159.98
15998
0011 1110 0111 1110
0011 1110 0111 1110
0001 1111 0100 0000
0000 1111 1010 0000
80.02
8002
0001 1111 0100 0010
0001 1111 0100 0010
0001 1111 0100 0000
0000 1111 1010 0000
80.01
8001
0001 1111 0100 0001
0001 1111 0100 0001
0001 1111 0100 0000
0000 1111 1010 0000
80.00
8000
0001 1111 0100 0000
0001 1111 0100 0000
0001 1111 0100 0000
0000 1111 1010 0000
79.99
7999
0001 1111 0011 1111
0001 1111 0011 1111
0001 1111 0011 1111
0000 1111 1010 0000
79.98
7998
0001 1111 0011 1110
0001 1111 0011 1110
0001 1111 0011 1110
0000 1111 1010 0000
40.02
4002
0000 1111 1010 0010
0000 1111 1010 0010
0000 1111 1010 0010
0000 1111 1010 0000
40.01
4001
0000 1111 1010 0001
0000 1111 1010 0001
0000 1111 1010 0001
0000 1111 1010 0000
40.00
4000
0000 1111 1010 0000
0000 1111 1010 0000
0000 1111 1010 0000
0000 1111 1010 0000
39.99
3999
0000 1111 1001 1111
0000 1111 1001 1111
0000 1111 1001 1111
0000 1111 1001 1111
39.98
3998
0000 1111 1001 1110
0000 1111 1001 1110
0000 1111 1001 1110
0000 1111 1001 1110
0.02
2
0000 0000 0000 0010
0000 0000 0000 0010
0000 0000 0000 0010
0000 0000 0000 0010
0.01
1
0000 0000 0000 0001
0000 0000 0000 0001
0000 0000 0000 0001
0000 0000 0000 0001
0
0
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
–0.01
–1
1111 1111 1111 1111
1111 1111 1111 1111
1111 1111 1111 1111
1111 1111 1111 1111
–0.02
–2
1111 1111 1111 1110
1111 1111 1111 1110
1111 1111 1111 1110
1111 1111 1111 1110
–39.98
–3998
1111 0000 0110 0010
1111 0000 0110 0010
1111 0000 0110 0010
1111 0000 0110 0010
–39.99
–3999
1111 0000 0110 0001
1111 0000 0110 0001
1111 0000 0110 0001
1111 0000 0110 0001
–40.00
–4000
1111 0000 0110 0000
1111 0000 0110 0000
1111 0000 0110 0000
1111 0000 0110 0000
–40.01
–4001
1111 0000 0101 1111
1111 0000 0101 1111
1111 0000 0101 1111
1111 0000 0110 0000
–40.02
–4002
1111 0000 0101 1110
1111 0000 0101 1110
1111 0000 0101 1110
1111 0000 0110 0000
–79.98
–7998
1110 0000 1100 0010
1110 0000 1100 0010
1110 0000 1100 0010
1111 0000 0110 0000
–79.99
–7999
1110 0000 1100 0001
1110 0000 1100 0001
1110 0000 1100 0001
1111 0000 0110 0000
–80.00
–8000
1110 0000 1100 0000
1110 0000 1100 0000
1110 0000 1100 0000
1111 0000 0110 0000
–80.01
–8001
1110 0000 1011 1111
1110 0000 1011 1111
1110 0000 1100 0000
1111 0000 0110 0000
–80.02
–8002
1110 0000 1011 1110
1110 0000 1011 1110
1110 0000 1100 0000
1111 0000 0110 0000
–159.98
–15998
1100 0001 1000 0010
1100 0001 1000 0010
1110 0000 1100 0000
1111 0000 0110 0000
–159.99
–15999
1100 0001 1000 0001
1100 0001 1000 0001
1110 0000 1100 0000
1111 0000 0110 0000
–160.00
–16000
1100 0001 1000 0000
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–160.01
–16001
1100 0001 0111 1111
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–160.02
–16002
1100 0001 0111 1110
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–319.98
–31998
1000 0011 0000 0010
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–319.99
–31999
1000 0011 0000 0001
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–320.00
–32000
1000 0011 0000 0000
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–320.01
–32001
1000 0011 0000 0000
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
–320.02
–32002
1000 0011 0000 0000
1100 0001 1000 0000
1110 0000 1100 0000
1111 0000 0110 0000
(1)
42
Out-of-range values are shaded.
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Bus Voltage Register 05h (Read-Only)
The Bus Voltage Register stores the most recent bus voltage reading, VBUS.
At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
BD12
BD11
BD10
BD9
BD8
BD7
BD6
BD5
BD4
BD3
BD2
BD1
BD0
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
At full-scale range = 16V (decimal = 4000, hex = 0FA0), and LSB = 4mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
0
BD11
BD10
BD9
BD8
BD7
BD6
BD5
BD4
BD3
BD2
BD1
BD0
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Power Register 06h (Read-Only)
Full-scale range and LSB are set by the Calibration Register. See the Programming the TMP512/13 Power
Measurement Engine section.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
PD15
PD14
PD13
PD12
PD11
PD10
PD9
PD8
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The Power Register records power in watts by multiplying the values of the current with the value of the bus
voltage according to the equation:
Current ´ BusVoltage
Power =
5000
Current Register 07h (Read-Only)
Full-scale range and LSB depend on the value entered in the Calibration Register. See the Programming the
TMP512/13 Power Measurement Engine section. Negative values are stored in twos complement format.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
CSIGN
CD14
CD13
CD12
CD11
CD10
CD9
CD8
CD7
CD6
CD5
CD4
CD3
CD2
CD1
CD0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The value of the Current Register is calculated by multiplying the value in the Shunt Voltage Register with the
value in the Calibration Register according to the equation:
Current =
ShuntVoltage ´ Calibration Register
4096
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Local Temperature Result Register 08h (Read-Only)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
T12
T11
T10
T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
—
PVLD
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The data format is 13 bits, 0.0625°C per bit. Full-scale allows display up to ±256°C.
T12–T0:
Temperature Result
Bits 15-3
Shows the temperature result according to the format shown in Table 10.
Table 10. 13-Bit Temperature Data Format
TEMPERATURE (°C)
DIGITAL OUTPUT (BINARY)
HEX
150
0 1001 0110 0000
0960
128
0 1000 0000 0000
0800
127.9375
0 0111 1111 1111
07FF
100
0 0110 0100 0000
0640
80
0 0101 0000 0000
0500
75
0 0100 1011 0000
04B0
50
0 0011 0010 0000
0320
25
0 0001 1001 0000
0190
0.25
0 0000 0000 0100
0004
0
0 0000 0000 0000
0000
–0.25
1 1111 1111 1100
1FFC
–25
1 1110 0111 0000
1E70
–55
1 1100 1001 0000
1C90
For positive temperatures (for example, +50°C):
Twos complement is not performed on positive numbers. Therefore, simply convert the number to binary code
with the 13-bit, left-justified format, and MSB = 0 to denote a positive sign.
Example: (+50°C)/(0.0625°C/count) = 800 = 320h = 0011 0010 0000
For negative temperatures (for example, –25°C):
Generate the twos complement of a negative number by complementing the absolute value binary number and
adding 1. Denote a negative number with MSB = 1.
Example: (–25°C)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000
Twos complement format: 1110 0110 1111 + 1 = 1110 0111 0000
PVLD
Power Valid Flag
Bit 1
This bit is the power valid flag.
The TMP512/13 do not start a temperature conversion if the power supply is not valid. If the voltage is less than
2.7V during a conversion, the PVLD bit is set to '1' and the temperature result may be incorrect.
44
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Remote Temperature Result 1 Register 09h, Remote Temperature Result 2 Register 0Ah, Remote
Temperature Result 3 Register (TMP513 Only) 0Bh (Read-Only)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
RT12
RT11
RT10
RT9
RT8
RT7
RT6
RT5
RT4
RT3
RT2
RT1
RT0
—
PVLD
DO
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The data format is 13 bits, 0.0625°C per bit. Full-scale allows display up to ±256°C.
RT12–RT0:
Remote Temperature Result
Bits 3-15
Shows the remote temperature measurement result.
PVLD
Power Valid Flag
Bit 1
This bit is the power valid flag.
The TMP512/13 do not start a temperature conversion if the power supply is not valid. If the voltage is less than
2.7V during a conversion, the PVLD bit is set to '1' and the temperature result may be incorrect.
DO
Diode Open Flag
Bit 0
This bit is the diode open flag.
If the Remote Channels are open during a conversion, then Diode Open bit is set at the end of the conversion.
Shunt Positive Limit Register 0Ch (Read/Write)
At full-scale range = ±320mV, 15-bit + sign, LSB = 10mV (decimal = 32000, positive value hex = 7D00, negative
value hex = 8300).
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SWP
SIGN
SWP14
SWP13
SWP12
SWP11
SWP10
SWP9
SWP8
SWP7
SWP6
SWP5
SWP4
SWP3
SWP2
SWP1
SWP0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Shunt Negative Limit Register 0Dh (Read/Write)
At full-scale range = ±320mV (decimal = 32000, positive value hex = 7D00, negative value hex = 8300). 15 bit +
sign, LSB = 10mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
SWN
SIGN
SWN14
SWN13
SWN12
SWN11
SWN10
SWN9
SWN8
SWN7
SWN6
SWN5
SWN4
SWN3
SWN2
SWN1
SWN0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bus Voltage Positive Limit Register 0Eh (Read/Write)
At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
BWU12
BWU11
BWU10
BWU9
BWU8
BWU7
BWU6
BWU5
BWU4
BWU3
BWU2
BWU1
BWU0
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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Bus Voltage Negative Limit Register 0Fh (Read/Write)
At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
BUO12
BUO11
BUO10
BUO9
BUO8
BUO7
BUO6
BUO5
BUO4
BUO3
BUO2
BUO1
BUO0
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Power Limit Register 10h (Read/Write)
At full-scale range, same as the Power Register (06h).
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
PW15
PW14
PW13
PW12
PW11
PW10
PW9
PW8
PW7
PW6
PW5
PW4
PW3
PW2
PW1
PW0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Local Temperature Limit Register 11h, Remote Temperature Limit 1 Register 12h, Remote Temperature
Limit 2 Register 13h, Remote Temperature Limit 3 Register 14h (TMP513 Only) (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
TH12
TH11
TH10
TH9
TH8
TH7
TH6
TH5
TH4
TH3
TH2
TH1
TH0
—
—
—
POR
VALUE
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
The data format is 13 bits.
TH12–TH0:
Temperature Limit
Bits 15-3
Shows the temperature limit.
Shunt Calibration Register 15h (Read/Write)
Current and power calibration are set in the Calibration Register. Note that bit D0 is not used in the calculation.
This register sets the current that corresponds to a full-scale drop across the shunt. Full-scale range and the LSB
of the current and power measurement depend on the value entered in this register. See the Programming the
TMP512/13 Power Measurement Engine section. This register is suitable for use in overall system calibration.
Note that the '0' POR values are all default.
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0 (1)
BIT
NAME
FS15
FS14
FS13
FS12
FS11
FS10
FS9
FS8
FS7
FS6
FS5
FS4
FS3
FS2
FS1
FS0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(1)
46
D0 is a void bit and is always '0'. It is not possible to write a '1' to D0.
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n-Factor 1 Register 16h (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
NF7
NF6
NF5
NF4
NF3
NF2
NF1
NF0
HST7
HST6
HST5
HST4
HST3
HST2
HST1
HST0
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
NF7–NF0:
n-Factor Bits
Bits 15-8
Shows the n-factor for Channel 1 according to the range indicated in Table 11.
Table 11. n-Factor Range (1)
NADJUST
(1)
BINARY
HEX
DECIMAL
n
0111 1111
7F
127
1.747977
0000 1010
0A
10
1.042759
0000 1000
08
8
1.035616
0000 0110
06
6
1.028571
0000 0100
04
4
1.021622
0000 0010
02
2
1.014765
0000 0001
01
1
1.011371
0000 0000
00
0
1.008
1111 1111
FF
–1
1.004651
1111 1110
FE
–2
1.001325
1111 1100
FC
–4
0.994737
1111 1010
FA
–6
0.988235
1111 1000
F8
–8
0.981818
1111 0110
F6
–10
0.975484
1000 0000
80
–128
0.706542
Shaded values are default.
HST7–HST0:
Hysteresis Register Bits
Bits 7-0
The hysteresis register is binary coded. 1LSB is equal to 0.5°C, so the possible hysteresis range is 0°C to 127.5°C.
n-Factor 2 Register 17h (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
NF7
NF6
NF5
NF4
NF3
NF2
NF1
NF0
—
—
—
—
—
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
NF7–NF0:
n-Factor Bits
Bits 15-8
Shows the n-factor for Channel 2 according to the range indicated in Table 11.
n-Factor 3 Register 18h (TMP513 Only) (Read/Write)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
NF7
NF6
NF5
NF4
NF3
NF2
NF1
NF0
—
—
—
—
—
—
—
—
POR
VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
NF7–NF0:
n-Factor Bits
Bits 15-8
Shows the n-factor for Channel 3 according to the range indicated in Table 11.
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Manufacturer ID Register 1Eh and FEh (Read-Only)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
ID7
ID6
ID5
ID4
ID3
ID2
ID1
ID0
—
—
—
—
—
—
—
—
POR
VALUE
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
ID7–ID0:
Identification Register Bits
Bits 15-8
These bits provide the manufacturer ID.
Device ID Register 1Fh and FFh (Read-Only)
BIT #
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
DID7
DID6
DID5
DID4
DID3
DID2
DID1
DID0
—
—
—
—
—
—
—
—
TMP512
POR
VALUE
0
0
1
0
0
0
1
0
1
1
1
1
1
1
1
1
TMP513
POR
VALUE
0
0
1
0
0
0
1
1
1
1
1
1
1
1
1
1
DID7–DID0:
Identification Register Bits
Bits 15-8
These bits provide the device ID.
48
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PACKAGE OPTION ADDENDUM
www.ti.com
2-Jul-2010
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
Samples
(Requires Login)
TMP512AID
ACTIVE
SOIC
D
14
50
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Purchase Samples
TMP512AIDR
ACTIVE
SOIC
D
14
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Request Free Samples
TMP513AID
ACTIVE
SOIC
D
16
40
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Purchase Samples
TMP513AIDR
ACTIVE
SOIC
D
16
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Request Free Samples
(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 - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
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.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry 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
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Jul-2010
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
TMP512AIDR
Package Package Pins
Type Drawing
SOIC
D
14
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
2500
330.0
16.4
Pack Materials-Page 1
6.5
B0
(mm)
K0
(mm)
P1
(mm)
9.0
2.1
8.0
W
Pin1
(mm) Quadrant
16.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Jul-2010
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TMP512AIDR
SOIC
D
14
2500
346.0
346.0
33.0
Pack Materials-Page 2
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