Intersil ISL6421ER-T Single output lnb supply and control voltage regulator with i2c interface for advanced satellite set-top box design Datasheet

ISL6421
®
Data Sheet
July 2004
Single Output LNB Supply and Control
Voltage Regulator with I2C Interface for
Advanced Satellite Set-top Box Designs
FN9130.1
Features
The ISL6421 is a highly integrated solution for supplying
power and control signals from advanced satellite set-top
box (STB) modules to the low noise block (LNB). This device
is comprised of a current-mode boost PWM and a low-noise
linear regulator, along with the circuitry required for I2C
device interfacing and for providing DiSEqCTM standard
control signals to the LNB.
A regulated output voltage is available at the output terminal
(VOUT) to support the operation of the antenna port in
advanced satellite STB applications. The regulated output
may be set to either 13V or 18V by use of the voltage select
command (VSEL) through the I2C bus. Additionally, to
compensate for the voltage drop in the coaxial cable, the
voltage may be increased by 1V with the line length
compensation (LLC) feature. An enable command sent on
the I2C bus provides standby mode control for the PWM and
linear combination, disabling the output to conserve power.
A current-mode boost converter provides the linear regulator
with an input voltage that is set to the required output
voltage, plus 1.2V (typ.) to insure minimum power
dissipation. This maintains a constant voltage drop across
the linear pass element, while permitting an adequate
voltage range for tone injection.
• Switch-Mode Power Converter for Lowest Dissipation
- Boost PWM with >92% Efficiency
- Selectable 13V or 18V Outputs
- Digital Cable Length Compensation (1V)
• External Pin to Select 13V/18V Options
• I2C Compatible Interface for Remote Device Control
- Registered Slave Address 0001 00XX
- Fully Functional 3.3V, 5V Operation up to 400kHz
• Built-In Tone Oscillator Factory Trimmed to 22kHz
- Facilitates DiSEqC (EUTELSAT) Encoding
• Internal Over-Temperature Protection and Diagnostics
• Internal Overload and Overtemp Flags (Visible on I2C)
• LNB Short-Circuit Protection and Diagnostics
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Product Outline
- Near Chip-Scale Package Footprint
• Pb-free available
Applications
• LNB Power Supply and Control for Satellite Set-Top Box
The device is capable of providing 450mA (typ.).
References
Ordering Information
• Tech Brief 389 (TB389) - “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”; Available
on the Intersil website, www.intersil.com
PART NUMBER
ISL6421ER
ISL6421ER-T
ISL6421ERZ
(See Note)
ISL6421ERZ-T
(See Note)
TEMP. RANGE
(oC)
-20 to 85
PACKAGE
PKG.
DWG. #
32 Ld 5x5 QFN L32.5x5
32 Ld 5x5 QFN Tape and Reel
-20 to 85
L32.5x5
32 Ld 5x5 QFN L32.5x5
(Pb-free)
32 Ld 5x5 QFN Tape and Reel
(Pb-free)
L32.5x5
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003-2004. All Rights Reserved
ISL6421
Pinout
NC
NC
NC
NC
NC
VCC
CPVOUT
CPSWIN
ISL6421ER (32 LEAD 5X5 QFN)
TOP VIEW
32
31
30
29
28
27
26
25
22 NC
SEL18V
4
21 NC
NC
5
20 AGND
BYPASS
6
19 VOUT
PGND
7
18 DSQIN
GATE
8
17 TCAP
9
10
11
12
13
14
15
16
SCL
3
ADDR
SGND
SDA
23 NC
NC
2
VSW
NC
COMP
24 CPSWOUT
FB
1
CS
PGND
Typical Application Schematic
VIN = 8V TO 14V
+ C3
56µF
L1
33µH
D1
+ C2
56µF
C1
1µF
C4
1µF
ISL6421
STPS2L40U
ADDR
GATE
SDA
V
SCL
V
CS
C11
R3
DSQIN
SGND
V
R1
0.1
VCC
V
R2
SEL18V
V
Q1
FDS6612A
C6
C5
PGND
CPSWIN
COMP
CPSWOUT
FB
CPVOUT
VSW
BYPASS
C8
VOUT
TCAP
C11
VOUT
C10
2
C7
AGND
C9
Block Diagram
SEL18V
OLF
OVERCURRENT
PROTECTION
LOGIC SCHEME 1
COUNTER
DCL
PWM
LOGIC
GATE
Q
S
OC
CLK
3
OLF
ISEL
PGND
ILIM
I2C
ENT
INTERFACE
LLC
DCL
-
CLK
BAND GAP
REF VOLTAGE
COMP
BGV
22kHz
TONE
+
-
TONE
INJ
CKT
+
OTF
CPVOUT
INT 5V
SOFT-START
EN
TCAP
UVLO
POR
SOFT-START
AGND
SGND
THERMAL
SHUTDOWN
ON CHIP
LINEAR
BYPASS
VCC
ENT
DSQIN
VSW
VOUT
ISL6421
VREF
OSC.
220kHz
÷ 10 AND
WAVE SHAPING
REF
VOLTAGE
ADJ
FB
SCL
SCL
VSEL
∑
SLOPE
COMPENSATION
ADDR
ADDR
EN
OTF
+
CS
CS
AMP
SDA
SDA
CHARGE PUMP
CPSWIN
CPSWOUT
ISL6421
Absolute Maximum Ratings
Thermal Information
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V
Logic Input Voltage Range (SDA, SCL, ENT) . . . . . . . . -0.5V to 7V
Output Current . . . . . . . . . . . . . . . . . . . . Externally/Internally Limited
Thermal Resistance
θJA (oC/W)
θJC (oC/W)
QFN Package (Notes 1, 2). . . . . . . . . .
32
4
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -40oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
NOTE: The device junction temperature should be kept below
150oC. Thermal shut-down circuitry turns off the device if junction
temperature exceeds +150oC typically.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For θJC, the “case temperature” location is the center of the exposed metal pad on the package underside. See Tech Brief TB379.
VCC = 12V, TA = -20oC to +85oC, unless otherwise noted. Typical values are at TA = 25oC. EN = H, LLC = L,
ENT = L, DCL = L, DSQIN = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C
access to the system.
Electrical Specifications
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
8
12
14
V
EN = L
-
1.5
3.0
mA
EN = LLC = VSEL = ENT = H, No Load
-
4.0
8.0
mA
Start Threshold
7.5
-
7.95
V
Stop Threshold
7.0
-
7.55
V
Start to Stop Hysteresis
350
400
500
mV
-
1024
-
Cycles
Operating Supply Voltage Range
Standby Supply Current
Supply Current
IIN
UNDER VOLTAGE LOCKOUT
SOFT START
COMP Rise Time (Note 2)
(Note 4)
OUTPUT VOLTAGE
Output Voltage (Note 3)
Line Regulation
Load Regulation
VOUT
VSEL = L, LLC = L
12.74
13.0
13.26
V
VOUT
VSEL = L, LLC = H
13.72
14.0
14.28
V
VOUT
VSEL = H, LLC = L
17.64
18.0
18.36
V
VOOU
VSEL = H, LLC = H
18.62
19.0
19.38
V
DVOUT
VIN = 8V to 14V; VOUT = 13V
-
4.0
40.0
mV
VIN = 8V to 14V; VOUT = 18V
-
4.0
60.0
mV
IO = 12mA to 450mA
-
50
80
mV
575
-
950
mA
-
900
-
ms
-
20
-
ms
DVOUT
Dynamic Output Current Limiting
IMAX
DCL = L
Dynamic Overload Protection Off Time
TOFF
DCL = L, Output Shorted (Note 4)
Dynamic Overload Protection On Time
TON
22kHz TONE
Tone Frequency
ftone
ENT = H
20.0
22.0
24.0
kHz
Tone Amplitude
Vtone
ENT = H
550
680
900
mV
Tone Duty Cycle
dctone
ENT = H
40
50
60
%
Tone Rise or Fall Time
Tr, Tf
ENT = H
5
8
14
µs
4
ISL6421
VCC = 12V, TA = -20oC to +85oC, unless otherwise noted. Typical values are at TA = 25oC. EN = H, LLC = L,
ENT = L, DCL = L, DSQIN = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C
access to the system. (Continued)
Electrical Specifications
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
-
1.2
-
V
-
-
1.5V
V
3.5
-
-
V
-
1
-
µA
150
200
250
mV
-
700
-
nA
Static current mode, DCL = H
325
400
500
mV
LINEAR REGULATOR
Drop-out Voltage
Iout = 450mA (Note 4)
DSQIN PIN
DSQIN pin logic Low
DSQIN pin Logic HIGH
DSQIN pin Input Current
CURRENT SENSE
Current Limiting Threshold (max. input)
Input Bias Current
IBIAS
Over Current Threshold
ERROR AMPLIFIER
Open Loop Voltage Gain
AOL
(Note 4)
70
88
-
dB
Gain Bandwidth Product
GBP
(Note 4)
10
-
-
MHz
90
93
-
%
-
20
-
ns
200
220
240
kHz
PWM
Maximum Duty Cycle
Minimum Pulse Width
(Note 4)
OSCILLATOR
Oscillator Frequency
fo
Fixed at (10)(ftone)
THERMAL PROTECTION
Thermal Shutdown
Temperature Shutdown Threshold
(Note 4)
-
150
-
Temperature Shutdown Hysteresis
(Note 4)
-
20
-
NOTES:
3. Internal Digital Soft-start
4. Voltage programming signals VSEL and LLC are implemented via the I2C bus.
IO = 450mA.
5. Guaranteed by Design.
5
ISL6421
Functional Pin Description
SYMBOL
FUNCTION
SDA
Bidirectional data from/to I2C bus.
SCL
Clock from I2C bus.
VSW
Input of the linear post-regulator.
PGND
Dedicated ground for the output gate driver of the PWM.
CS
Current sense input; connect Rsc at this pin for desired over current value for the PWM.
SGND
Small signal ground for the IC.
AGND
Analog ground for the IC.
TCAP
Capacitor for setting rise and fall time of the output of the LNB. Use a capacitor value of 1µF or higher.
BYPASS
Bypass capacitor for internal 5V.
DSQIN
When HIGH this pin enables the internal 22kHz modulation for the LNB, Use this pin for tone enable function for
the LNB.
VCC
Main power supply to the chip.
GATE
This is the device output of the PWM. This high current driver output is capable of driving the gate of a power FET.
This output is actively held low when Vcc is below the UVLO threshold.
VOUT
Output voltage for the LNB.
ADDR
Address pin to select two different addresses per voltage level at this pin.
COMP
Error amp output used for compensation.
FB
Feedback pin for the PWM.
CPVOUT, CPSWIN, CPSWOUT Charge pump connections.
SEL18V
When connected HIGH, this pin will change the output of the PWM to 18V.
Functional Description
The ISL6421 single output voltage regulator makes an ideal
choice for advanced satellite set-top box and personal video
recorder applications. Both supply and control voltage
outputs for a low noise block (LNB) are available
simultaneously in any output configuration. The device
utilizes a built-in DC/DC step-converter that, from a single
supply source ranging from 8V to 14V, generates the voltage
that enables the linear post-regulator to work with a
minimum of dissipated power. An under voltage lockout
circuit disables the circuit when VCC drops below a fixed
threshold (7.5V typ).
modulating the dc output with a 0.3V, 22kHz, symmetrical
waveform. The presence of this signal usually gives the LNB
information about the band to be received.
Burst coding of the 22kHz tone can be accomplished due to
the fast response of the DSQIN input and rapid tone
response. This allows implementation of the DiSEqC
(EUTELSAT) protocols.
When the ENT bit is set HIGH, a continuous 22kHz tone is
generated regardless of the DSQIN pin logic status. The
ENT bit must be set LOW when the DSQIN pin is used for
DiSEqC encoding.
Linear Regulator
DiSEqC Encoding
The internal oscillator is factory-trimmed to provide a tone of
22kHz in accordance with DISeqC standards. No further
adjustment is required. The 22kHz oscillator can be
controlled either by the I2C interface (ENT bit) or by a
dedicated pin (DSQIN) that allows immediate DiSEqC data
encoding for the LNB. All the functions of this IC are
controlled via the I2C bus by writing to the system registers
(SR). The same registers can be read back, and two bits will
report the diagnostic status. The internal oscillator operates
the converters at ten times the tone frequency. The device
offers full I2C compatible functionality, 3.3V or 5V, and up to
400kHz operation.
If the Tone Enable (ENT) bit is set LOW through I2C, then
the DSQIN terminal activates the internal tone signal,
6
The output linear regulator will sink and source current. This
feature allows full modulation capability into capacitive loads
as high as 0.25µF. In order to minimize the power
dissipation, the output voltage of the internal step-up
converter is adjusted to allow the linear regulator to work at
minimum dropout.
When the device is put in the shutdown mode (EN = LOW),
the PWM power block is disabled. When the regulator block
is active (EN = HIGH), the output can be logic controlled to
be 13V or 18V (typical) by means of the VSEL bit (Voltage
Select) for remote controlling of non-DiSEqC LNBs.
Additionally, it is possible to increment by 1V (typical) the
selected voltage value to compensate for the excess voltage
drop along the coaxial cable (LLC bit HIGH).
ISL6421
Output Timing
TABLE 1.
The programmed output voltage rise and fall times can be
set by an external capacitor. The output rise and fall times
will be approximately 3400 times the TCAP value. For the
recommended range of 0.47µF to 2.2µF, the rise and fall
time would be 1.6ms to 7.6ms. Using a 0.47µF capacitor
insures the PWM stays below its overcurrent threshold when
charging a 120µF VSW filter cap during the worst case 13V
to 19V transition. A typical value of 1.0µF is recommended.
This feature affects the programmed voltage rise and fall
times.
Current Limiting (Only one ISEL option needed)
The current limiting block can operate either statically
(simple current clamp) or dynamically. The threshold is
between 575mA and 950mA. When the DCL (Dynamic
Current Limiting) bit is set to LOW, the over current
protection circuit works dynamically. That is, as soon as an
overload is detected, the output is shutdown for a time tOFF,
typically 900ms. Simultaneously the overload flag (OLF) bit
of the system register is set to HIGH. After this time has
elapsed, the output is resumed for a time Ton = 20ms.
During Ton, the device output will be current limited to
between 575mA and 950mA. At the end of Ton, if the
overload is still detected, the protection circuit will cycle
again through Toff and Ton. At the end of a full Ton during
which no overload is detected, normal operation is resumed
and the OLF bit is reset to LOW. Typical Ton+Toff time is
920ms as determined by an internal timer. This dynamic
operation can greatly reduce the power dissipation in a short
circuit condition, still ensuring excellent power-on start-up in
most conditions.
However, there could be some cases in which a highly
capacitive load on the output may cause a difficult start-up,
when the dynamic protection is chosen. This can be solved
by initiating a power start-up in static mode (DCL = HIGH)
and then switching to the dynamic mode (DCL = LOW) after
a chosen amount of time. When in static mode, the OLF bit
goes HIGH when the current clamp limit is reached and
returns LOW when the overload condition is cleared. The
OLF bit will be LOW at the end of initial power-on soft-start.
Thermal Resistance
This IC is protected against overheating. When the junction
temperature exceeds 150°C (typical), the step-up converter
and the linear regulator are shut off and the overtemp flag
(OTF) bit of the SR is set HIGH. Normal operation is
resumed and the OTF bit is reset LOW, when the junction is
cooled down to 130°C (typical).
I2C BITS
SEL18V
O/P VOLTAGE
13V
Low
13V
13V
High
18V
I2C Bus Interface for ISL6421
(Refer to Philips I2C Specification, Rev. 2.1)
Data transmission from main microprocessor to the ISL6421
and vice versa takes place through the 2 wires I2C bus
interfaces, consisting of the two lines SDA and SCL. Both
SDA and SCL are bidirectional lines, connected to a positive
supply voltage via a pull up resistor. (Pull up resistors to
positive supply voltage must be externally connected). When
the bus is free, both lines are HIGH. The output stage of
ISL6421 will have an open drain/open collector in order to
perform the wired-AND function. Data on the I2C bus can be
transferred up to 100kbits/s in the standard-mode or up to
400kbits/s in the fast-mode. The level of logic “0” and logic
“1” is dependent of associated value of Vdd as per electrical
specification table. One clock pulse is generated for each
data bit transferred.
Data Validity
The data on the SDA line must be stable during the HIGH
period of the clock. The HIGH or LOW state of the data line
can only change when the clock signal on the SCL line is
LOW. Refer to Figure 1.
SDA
SCL
DATA LINE CHANGE
STABLE
OF DATA
DATA VALID ALLOWED
FIGURE 1. DATA VALIDITY
START and STOP Conditions
As shown in the Figure 2, START condition is a HIGH to
LOW transition of the SDA line, while SCL is HIGH. The
STOP condition is a LOW to HIGH transition on the SDA
line, while SCL is HIGH. A STOP condition must be sent
before each START condition.
SDA
External Output Voltage Selection
The output voltage can be selected by the I2C bus.
Additionally, the QFN package offers a pin (SEL18V) for
independent 13V/18V output voltage selection. When using
this pin, the I2C bits should be initialized to 13V status.
SCL
S
P
START
CONDITION
STOP
CONDITION
FIGURE 2. START AND STOP WAVEFORMS
7
ISL6421
Byte Format
Transmission Without Acknowledge
Every byte put on the SDA line must be 8-bits long. The
number of bytes that can be transmitted per transfer is
unrestricted. Each byte has to be followed by an acknowledge
bit. Data is transferred with the most significant bit first (MSB).
Avoiding detection of the acknowledgement, the
microprocessor can use a simpler transmission; it waits one
clock without checking the slave acknowledging, and sends
the new data.
Acknowledge
This approach, though, is less protected from error and
decreases the noise immunity.
The master (microprocessor) puts a resistive HIGH level on
the SDA line during the acknowledge clock pulse (Figure 3).
The peripheral that acknowledges has to pull down (LOW)
the SDA line during the acknowledge clock pulse, so that the
SDA line is stable LOW during this clock pulse. (Of course,
set-up and hold times must also be taken into account.)
ISL6421 Software Description
Interface Protocol
The interface protocol is comprised of the following, as
shown below in Table 2:
The peripheral which has been addressed has to generate
an acknowledge after the reception of each byte, otherwise
the SDA line remains at the HIGH level during the ninth
clock pulse time. In this case, the master transmitter can
generate the STOP information in order to abort the transfer.
The ISL6421 will not generate the acknowledge if the
POWER OK signal from the UVLO is LOW.
• A start condition (S)
• A chip address byte (MSB on left; the LSB bit determines
read (1) or write (0) transmission) (the assigned I2C slave
address for the ISL6421 is 0001 00XX)
• A sequence of data (1 byte + Acknowledge)
• A stop condition (P)
SCL
8
2
1
TABLE 2. INTERFACE PROTOCOL
9
S
SDA
0
0
0
1
0
0
0
R/W ACK Data (8 bits) ACK P
Transmitted Data (I2C bus WRITE mode)
MSB
START
When the R/W bit in the chip is set to 0, the main
microprocessor can write on the system register (SR1) of the
ISL6421 via I2C bus. These will be written by the
microprocessor as shown below.
ACKNOWLEDGE
FROM SLAVE
FIGURE 3. ACKNOWLEDGE ON THE I2C BUS
TABLE 3. SYSTEM REGISTER 1 (SR1)
R, W
R, W
R, W
R, W
R, W
R, W
R, W
R
SR1
DCL
X
ENT1
LLC1
VSEL1
EN1
OLF1
R, W
R, W
R, W
R, W
R, W
R, W
R
R
SR2
X
X
X
X
EN2
OTF
X
TABLE 4. SYSTEM REGISTER 2 (SR2)
System Register Format
• R, W = Read and Write bit
• R = Read-only bit
All bits reset to 0 at Power-On
TABLE 5. SYSTEM REGISTER (SR1 AND SR2) CONFIGURATION
SR
DCL
ISEL1
ENT1
LLC1
VSEL1
EN1
OLF1
FUNCTION
0
1
0
0
1
SR1 is selected
0
1
0
0
1
Vout1 = 13V, Vboost1 = 13V + Vdrop
0
1
0
1
1
Vout1 = 18V, Vboost1 = 18V + Vdrop
0
1
1
0
1
Vout1 = 14V, Vboost1 = 14V + Vdrop
0
1
1
1
1
Vout1 = 19V, Vboost1 = 19V + Vdrop
0
1
0
1
22kHz tone is controlled by the DSQIN pin
0
1
1
1
22kHz tone is ON, the DSQIN input is disabled
8
ISL6421
TABLE 5. SYSTEM REGISTER (SR1 AND SR2) CONFIGURATION (Continued)
SR
DCL
ISEL1
ENT1
LLC1
VSEL1
EN1
0
1
1
1
Dynamic current limit NOT selected
0
0
1
1
Dynamic current limit selected
0
X
1
X
X
X
0
PWM and Linear for channel 1 disabled
SR
-
-
-
-
EN2
OTF
-
1
X
X
X
X
0
X
X
Received Data (I2C Bus Read Mode)
The ISL6421 can provide to the master a copy of the System
Register information via the I2C bus in read mode. The read
mode is Master activated by sending the chip address with
R/W bit set to 1. At the following Master generated clock bits,
the ISL6421 issues a byte on the SDA data bus line (MSB
transmitted first).
At the ninth clock bit the MCU master can:
OLF1
FUNCTION
FUNCTION
SR2 is selected; to read OTF flag.
(I2C comes up with EN = 0, EN goes HIGH at the same time
as (or later than) all other I2C data for the PWM becomes
valid).
ADDRESS Pin
Connecting this pin to GND forces the chip I2C interface
address to 0001000; applying a voltage >2.7V forces the
address to 0001001, as shown below.
TABLE 7. ADDRESS PIN CHARACTERISTICS
• Acknowledge the reception, starting in this way the
transmission of another byte from the ISL6421.
• Not acknowledge, stopping the read mode
communication.
While the whole register is read back by the microprocessor,
only the two read-only bits, OLF and OTF, convey diagnostic
information about the ISL6421.
VADDR
MIN
TYP
MAX
Vaddr-1
“0001000”
0V
-
2.0V
Vaddr-2
“0001001”
2.7V
-
5.0V
I2C Electrical Characteristics
TABLE 6. READING SYSTEM REGISTERS
DCL ISEL ENT LLC VSEL EN OTF OLF
These bits are read as they were
after the last write operation.
0
Tj <= 130°C, Normal
operation
1
Tj > 150°C, Power
blocks disabled
0
Iout < Imax, Normal
operation
1
Iout > Imax, Overload
protection triggered
Power–On I2C Interface Reset
The I2C interface built into the ISL6421 is automatically reset
at power-on. The I2C interface block will receive a Power OK
logic signal from the UVLO circuit. This signal will go HIGH
when chip power is OK. As long as this signal is LOW, the
interface will not respond to any I2C commands and the
system register SR is initialized to all zeros, thus keeping the
power blocks disabled.
Once Vcc rises above the UVLO level, the POWER OK
signal given to the I2C interface block will be HIGH, the I2C
interface becomes operative and the SR can be configured
by the main microprocessor. About 400mV of hysteresis is
provided in the UVLO threshold to avoid false triggering of
the Power-On reset circuit.
9
TABLE 8. I2C SPECIFICATIONS
FUNCTION
PARAMETER
TEST
CONDITION
MIN
TYP
Input Logic High, SDA, SCL
VIH
0.7 x VDD
Input Logic Low, SDA, SCL
VIL
0.3 x VDD
Input Logic
Current, IIL
SCL Clock
Frequency
SDA, SCL;
0.4V < Vin < 4.5V
MAX
10µA
0
100kHz
400kHz
ISL6421
Quad Flat No-Lead Plastic Package (QFN)
Micro Lead Frame Plastic Package (MLFP)
L32.5x5
32 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
(COMPLIANT TO JEDEC MO-220VHHD-2 ISSUE C
MILLIMETERS
SYMBOL
MIN
NOMINAL
MAX
NOTES
A
0.80
0.90
1.00
-
A1
-
-
0.05
-
A2
-
-
1.00
9
A3
b
0.20 REF
0.18
D
0.30
5,8
5.00 BSC
D1
D2
0.23
9
-
4.75 BSC
2.95
3.10
9
3.25
7,8
E
5.00 BSC
-
E1
4.75 BSC
9
E2
2.95
e
3.10
3.25
7,8
0.50 BSC
-
k
0.25
-
-
-
L
0.30
0.40
0.50
8
L1
-
-
0.15
10
N
Nd
32
2
8
3
Ne
8
8
3
P
-
-
0.60
9
θ
-
-
12
9
Rev. 1 10/02
NOTES:
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
3. Nd and Ne refer to the number of terminals on each D and E.
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
8. Nominal dimensions are provided to assist with PCB Land Pattern
Design efforts, see Intersil Technical Brief TB389.
9. Features and dimensions A2, A3, D1, E1, P & θ are present when
Anvil singulation method is used and not present for saw
singulation.
10. Depending on the method of lead termination at the edge of the
package, a maximum 0.15mm pull back (L1) maybe present. L
minus L1 to be equal to or greater than 0.3mm.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
10
Similar pages