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DS2745 Datasheet

  • DS2745

  • Low-Cost I2C Battery Monitor

  • 14頁

  • MAXIM   MAXIM

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Low-Cost I
2
C Battery Monitor
www.maxim-ic.com
DS2745
FEATURES
16-Bit Bidirectional Current Measurement
1.56mV LSB, 鹵51.2mV Dynamic Range
104mA LSB, 鹵3.4A Dynamic Range (RSNS =
15mW)
Current Accumulation Register Resolution
6.25mVhr LSB, 鹵204.8mVh Range
0.417mAhr LSB, 鹵13.65Ah Range
(R
SNS
= 15mW)
11-Bit Voltage Measurement
4.88mV LSB, 0V to 5V Input Range
11-Bit Temperature Measurement
0.125潞C Resolution, -20潞C to +70潞C
2
Industry Standard I C* Interface
Low Power Consumption:
Active Current:
70mA typical, 100mA max
Sleep Current:
1mA typical, 3mA max
PIN CONFIGURATION
SCL
SDA
PIO
SNS
1
2
3
4
8
7
6
5
VDD
VIN
CTG
VSS
mMAX
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
2
measurement takes place on-chip. A standard I C
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.
BLOCK DIAGRAM
PACK+
VDD
COMM
Fuel Gauge
Algorithm
碌P
DS2745
SDA
SCL
SNS
VIN
VSS
APPLICATIONS
Cellular
GPS
PDAs
Handheld Products
Li+
Protector
PACK-
Sense
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.
*I
2
C is a trademark of Philips Corp. Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system
conforms to the I
2
C Standard Specification as defined by Philips.
1 of 14
091405

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