DS2745 Maxim Integrated Products, DS2745 Datasheet - Page 6

• Manufacturer Part Number: DS2745
• Description: Low-Cost I2C Battery Monitor
• Manufacturer: Maxim Integrated Products

DETAILED DESCRIPTION
Current is measured bidirectionally over a dynamic range of ±51.2mV with a resolution of 1.56V. Assuming a
15m sense resistor, the current sense range is ±3.4A, with a 1 LSB resolution of 104A. Current measurements
are performed at regular intervals and accumulated with each measurement to support accurate “coulomb
counting”. Each current measurement is reported with sign and magnitude in the two-byte Current register. The
Accumulated Current register (ACR) reports the coulomb count and supports a wide range of battery sizes. Battery
voltage measurements are reported in the two-byte Voltage register with 11-bit (4.88mV) resolution, and
Temperature is reported in the two-byte Temperature register with 0.125C resolution.
The DS2745 measurements can be used directly to provide accurate fuel gauging in typical use conditions, or
along with FuelPack™ algorithms to form a complete and accurate solution for estimating remaining capacity over
wide temperature and operating conditions.
Through its two wire I
and Measurement registers. Additionally, the I
Figure 3. APPLICATION EXAMPLE
FuelPack is a trademark of Maxim Integrated Products, Inc.
1 Cell Li+
(Li+/Polymer)
Protection IC
2
102
C interface, the DS2745 allows a host system read/write access to the Status, Configuration
102
103
500
2
C slave address can be changed from the default after power up.
5.6V
(1)
1k
6 of 15
PIO
VSS
VIN
VDD
2.5V
DS2745
R
SNS
(1)
CTG
SNS
SDA
SCL
(1) Optional for 8kV/15kV ESD
DS2745 Low-Cost I
5.6V
(1)
5.6V
(1)
150
150
PACK+
CLOCK
DATA
PACK -
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2
C Battery Monitor