DS2745 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Low-Cost I2C Battery Monitor

www.maxim-ic.com
FEATURES
16-Bit Bidirectional Current Measurement
1.56mV LSB, ±51.2mV Dynamic Range
104mA LSB, ±3.4A Dynamic Range (RSNS =
15mW)
Current Accumulation Register Resolution
6.25mVhr LSB, ±204.8mVh Range
0.417mAhr LSB, ±13.65Ah Range
(R_SNS = 15mW)
11-Bit Voltage Measurement
4.88mV LSB, 0V to 5V Input Range
11-Bit Temperature Measurement
0.125ºC Resolution, -20ºC to +70ºC
Industry Standard I²C* Interface
Low Power Consumption:
Active Current:
70mA typical, 100mA max
Sleep Current:
1mA typical, 3mA max
BLOCK DIAGRAM
PACK+
COMM
Fuel Gauge
Algorithm
µP
VDD
DS2745
SDA
VIN
SCL
SNS VSS
PACK-
Sense
Li+
Protector
DS2745
Low-Cost I²C Battery Monitor
PIN CONFIGURATION
SCL
SDA
PIO
SNS
1
8
2
7
3
6
4
5
mMAX
VDD
VIN
CTG
VSS
See Table 1 for Ordering Information.
DESCRIPTION
The DS2745 provides current-flow, voltage, and
temperature measurement data to support battery-
capacity monitoring in cost-sensitive applications. The
DS2745 can be mounted on either the host side or
pack side of the application. Current measurement
and coulomb counting is accomplished by monitoring
the voltage drop across an external sense resistor,
voltage measurement is accomplished through a
separate voltage-sense input, and temperature
measurement takes place on-chip. A standard I²C
interface with software programmable address gives
the controlling microprocessor access to all data and
status registers inside the DS2745. A low-power sleep
mode state conserves energy when the cell pack is in
storage.
APPLICATIONS
Cellular
GPS
PDAs
Handheld Products
Table 1. ORDERING INFORMATION
PART
DS2745U+
DS2745U+/T&R
MARKING
2745
2745
PIN-PACKAGE
mMAX package
DS2745U+ in Tape-and-Reel
+Denotes lead-free package.
*I²C is a trademark of Philips Corp. Purchase of I²C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I²C Patent Rights to use these components in an I²C system, provided that the system
conforms to the I²C Standard Specification as defined by Philips.
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