DS2745U+ Maxim Integrated Products, DS2745U+ Datasheet - Page 6
DS2745U+
Manufacturer Part Number
DS2745U+
Description
IC BATT MONITOR I2C 8-UMAX
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2745U.pdf
(15 pages)
Specifications of DS2745U+
Function
Fuel, Gas Gauge/Monitor
Battery Type
Lithium-Ion (Li-Ion); Nickel-Metal Hydride (NiMH)
Voltage - Supply
2.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Product
Fuel Gauges
Operating Supply Voltage
2.5 V to 5.5 V
Supply Current
70 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Charge Safety Timers
No
Mounting Style
SMD/SMT
Temperature Monitoring
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DETAILED DESCRIPTION
Current is measured bidirectionally over a dynamic range of ±51.2mV with a resolution of 1.56V. Assuming a
15m sense resistor, the current sense range is ±3.4A, with a 1 LSB resolution of 104A. 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 -
2
C Battery Monitor