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LTC2942IDCB#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC2942
1
2942fa
Typical applicaTion
DescripTion
Battery Gas Gauge
with Temperature,
Voltage Measurement
The LTC
®
2942 measures battery charge state, battery
voltage and chip temperature in handheld PC and portable
product applications. Its operating range is perfectly suited
for single-cell Li-Ion batteries. A precision coulomb counter
integrates current through a sense resistor between the
battery’s positive terminal and the load or charger. Battery
voltage and on-chip temperature are measured with an
internal 14-bit No Latency ∆∑™ ADC. The three measured
quantities (charge, voltage and temperature) are stored in
internal registers accessible via the onboard SMBus/I
2
C
interface.
The LTC2942 features programmable high and low thresh-
olds for all three measured quantities. If a programmed
threshold is exceeded, the device communicates an alert
using either the SMBus alert protocol or by setting a flag
in the internal status register.
The LTC2942 requires only a single low value sense resis-
tor to set the measured current range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆Σ, ThinSOT and Bat-Track are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FeaTures
applicaTions
n
Indicates Accumulated Battery Charge and
Discharge
n
High Accuracy Analog Integration
n
ADC Measures Battery Voltage and Temperature
n
Integrated Temperature Sensor
n
High Side Sense
n
1% Voltage and Charge Accuracy
n
±50mV Sense Voltage Range
n
SMBus/I
2
C Interface
n
Configurable Alert Output/Charge Complete Input
n
2.7V to 5.5V Operating Range
n
Quiescent Current Less than 100µA
n
Small 6-Pin 2mm × 3mm DFN package
n
Low Power Handheld Products
n
Cellular Phones
n
MP3 Players
n
Cameras
n
GPS
Total Charge Error vs
Differential Sense Voltage
+
SENSE
+
I
2
C/SMBus
TO HOST
SENSE
–
CHARGER
LTC2942
AL/CC
SDA
LOAD
0.1µF
2942 TA01a
1-CELL
Li-Ion
R
SENSE
100mΩ
SCL
GND
V
SENSE
(mV)
0.1
–1.0
CHARGE ERROR (%)
0
–0.5
–1.5
0.5
1.0
1 10 100
2942 TA01b
–2.0
V
SENSE
+ = 3.6V
2.0
1.5
LTC2942
2
2942fa
Supply Voltage (SENSE
+
) ............................. –0.3V to 6V
SCL, SDA, AL/CC ......................................... –0.3V to 6V
SENSE
–
.................................. –0.3V to (V
SENSE
+
+ 0.3V)
Operating Ambient Temperature Range
LTC2942C ................................................ 0°C to 70°C
LTC2942I.............................................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
(Notes 1, 2)
TOP VIEW
SENSE
–
AL/CC
SDA
SENSE
+
GND
SCL
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 150°C, θ
JA
= 120°C/W
EXPOSED PAD (PIN 7), DO NOT CONNECT
orDer inFormaTion
pin conFiguraTionabsoluTe maximum raTings
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Requirements
V
SENSE
+
Supply Voltage 2.7 5.5 V
I
SUPPLY
Supply Current (Note 3) Battery Gas Gauge On, ADC Sleep
l
70 100 µA
Battery Gas Gauge On, ADC Converting Voltage
l
300 350 µA
Battery Gas Gauge On, ADC Converting Temperature
l
350 420 µA
Shutdown
l
2.5 µA
Shutdown, V
SENSE
+
≤ 4.2V 1 µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling
l
2.5 2.6 2.7 V
Coulomb Counter
V
SENSE
Sense Voltage Differential Input
Range
V
SENSE
+
– V
SENSE
–
l
±50 mV
R
IDR
Differential Input Resistance,
Across SENSE
+
and SENSE
–
(Note 8)
400 kΩ
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2942CDCB#TRMPBF LTC2942CDCB#TRPBF LDVN 6-Lead (2mm × 3mm) Plastic DFN 0°C to 70°C
LTC2942IDCB#TRMPBF LTC2942IDCB#TRPBF LDVN 6-Lead (2mm × 3mm) Plastic DFN –40°C to 85°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC2942
3
2942fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
q
LSB
Charge LSB (Note 4) Prescaler M = 128 (Default), R
SENSE
= 50mΩ 0.085 mAh
TCE Total Charge Error (Note 5) 10mV ≤ |V
SENSE
| ≤ 50mV DC ±1 %
10mV ≤ |V
SENSE
| ≤ 50mV DC, V
SENSE
+
≤ 4.2V
l
±1.5 %
1mV ≤ |V
SENSE
| < 50mV DC (Note 8)
l
±3.5 %
Voltage Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
14 Bits
V
FS
Full-Scale Voltage
l
6 V
∆V
LSB
Quantization Step of 14-Bit
Voltage ADC
(Note 6) 366.2 µV
TUE
V
Voltage Total Unadjusted Error
l
1
1.3
%
%
Gain Gain Accuracy
l
1.3 %
V
OS
Offset Extrapolated from Measurements at 5.5V and 2.7V ±1 ±10 LSB
INL Integral Nonlinearity
l
±1 ±4 LSB
t
CONV
Conversion Time
l
15 ms
Temperature Measurement ADC
Resolution (No Missing Code) (Note 8) 10 Bits
T
FS
Full-Scale Temperature
l
600 K
∆T
LSB
Quantization Step of 10-Bit
Temperature ADC
(Note 6) 0.586 K
TUE
T
Temperature Total Unadjusted
Error
V
SENSE
+
≥ 2.8V (Note 8)
l
±5
±3
K
K
t
CONV
Conversion Time
l
15 ms
Digital Inputs and Digital Outputs
V
ITH
Logic Input Threshold, AL/CC,
SCL, SDA
l
0.3 • V
SENSE
+
0.7 • V
SENSE
+
V
V
OL
Low Level Output Voltage, AL/CC,
SDA
I = 3mA
l
0.4 V
I
IN
Input Leakage, AL/CC, SCL, SDA V
IN
= V
SENSE
+
/2
l
1 µA
C
IN
Input Capacitance, AL/CC, SCL,
SDA
(Note 8)
l
10 pF
t
PCC
Minimum Charge Complete (CC)
Pulse Width
1 µs
I
2
C Timing Characteristics
f
SCL(MAX)
Maximum SCL Clock Frequency
l
400 900 kHz
t
BUF(MIN)
Bus Free Time Between STOP/
START
l
1.3 µs
t
SU,STA(MIN)
Minimum Repeated START
Set-Up Time
l
600 ns
t
HD,STA(MIN)
Minimum Hold Time (Repeated)
START Condition
l
600 ns
t
SU,STO(MIN)
Minimum Set-Up Time for STOP
Condition
l
600 ns
t
SU,DAT(MIN)
Minimum Data Set-Up
Time Input
l
100 ns
t
HD,DATI(MIN)
Minimum Data Hold Time Input
l
0 µs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC2942IDCB#TRPBF

Mfr. #:
Buy LTC2942IDCB#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Bat Gas Gauge w/ Temp, V Measurement
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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