DS2745U+ Maxim Integrated Products, DS2745U+ Datasheet

IC BATT MONITOR I2C 8-UMAX

DS2745U+

Manufacturer Part Number
DS2745U+
Description
IC BATT MONITOR I2C 8-UMAX
Manufacturer
Maxim Integrated Products
Datasheet

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
19-4631; Rev 5/09
FEATURES
16-Bit Bidirectional Current Measurement
Current Accumulation Register Resolution
11-Bit Voltage Measurement
4.88mV LSB, 0V to 4.5V Input Range
11-Bit Temperature Measurement
0.125ºC Resolution, -20ºC to +70ºC
Industry Standard I
Low Power Consumption:
BLOCK DIAGRAM
Table 1. ORDERING INFORMATION
+Denotes a lead(Pb)-free/RoHS-compliant package.
www.maxim-ic.com
DS2745U+
DS2745U+T&R
1.56V LSB, ±51.2mV Dynamic Range
104A LSB, ±3.4A Dynamic Range (RSNS =
15m)
6.25Vhr LSB, ±204.8mVh Range
0.417mAhr LSB, ±13.65Ah Range
(R
Active Current:
70A typical, 100A max
Sleep Current:
1A typical, 3A max
SNS
= 15m)
PART
2
C Interface
MARKING
2745
2745
1 of 15
MAX package
DS2745U+ in Tape-and-Reel
PIN CONFIGURATION
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
measurement takes place on-chip. A standard I
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
See Table 1 for Ordering Information.
Low-Cost I
voltage-sense
SDA
SNS
SCL
PIO
PIN-PACKAGE
1
2
3
4
MAX
2
C Battery Monitor
input,
8
7
6
5
and
VDD
VIN
CTG
VSS
DS2745
temperature
2
C

Related parts for DS2745U+

DS2745U+ Summary of contents

Page 1

... DS2745. A low-power sleep mode state conserves energy when the cell pack is in storage. APPLICATIONS Cellular GPS PDAs Handheld Products MARKING MAX package 2745 2745 DS2745U+ in Tape-and-Reel DS2745 2 Low-Cost I C Battery Monitor VDD SCL 8 1 VIN SDA 2 ...

Page 2

ABSOLUTE MAXIMUM RATINGS* Voltage on All Pins Relative to V Operating Temperature Range Storage Temperature Range Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated ...

Page 3

Input Resistance, VIN Input Logic High: SCL, SDA, PIO Input Logic Low: SCL, SDA, PIO Output Logic Low: SDA, PIO Pulldown Current: SCL, SDA, PIO Input Capacitance: SCL, C SDA SLEEP Timeout t SLEEP 2-WIRE INTERFACE TIMING SPECIFICATIONS (V = ...

Page 4

All voltages are referenced to V Note 1: Offset specified after auto-calibration cycle and Current Offset Bias register (COBR) set to 00h. Note 2: To properly enter sleep mode, SMOD=1, and the application should hold SDA and SCL low for ...

Page 5

PIN DESCRIPTION PIN SYMBOL 1 SCL 2 SDA 3 PIO 4 SNS CTG 7 VIN Figure 2. BLOCK DIAGRAM Serial Clock Input. 2-Wire clock line. Input only. Connect this pin to the CLOCK ...

Page 6

... C interface, the DS2745 allows a host system read/write access to the Status, Configuration and Measurement registers. Additionally, the I Figure 3. APPLICATION EXAMPLE 1 Cell Li+ Protection IC (Li+/Polymer) 102 102 FuelPack is a trademark of Maxim Integrated Products, Inc slave address can be changed from the default after power up. 500 1k DS2745 PIO CTG ...

Page 7

POWER MODES The DS2745 operates in one of two power modes: active and sleep. While in active mode, the DS2745 operates as a high-precision battery monitor with voltage, temperature, current and accumulated current measurements acquired continuously and the resulting values ...

Page 8

Figure 5. TEMPERATURE REGISTER FORMAT MSB—Address MSb “S”: sign bit, “X”: reserved CURRENT MEASUREMENT In the active mode of operation, the DS2745 continually measures the current flow into and out of the ...

Page 9

CURRENT ACCUMULATION The Accumulated Current register (ACR) serves as an up/down counter holding a running count of charge stored in the battery. Current measurement results, plus a programmable bias value are internally summed, or accumulated, at the completion of each ...

Page 10

CURRENT BLANKING The Current Blanking feature modifies current measurement result prior to being accumulated in the ACR. Current Blanking occurs conditionally when a current measurement (raw current + COBR) falls in one of two defined ranges. The first range prevents ...

Page 11

Table 5. MEMORY MAP ADDRESS (HEX) 00 Reserved 01 Status/Config Register Reserved Reserved 0A Temperature Register MSB 0B Temperature Register LSB 0C Voltage Register MSB 0D Voltage Register LSB 0E Current Register MSB 0F ...

Page 12

BUS SYSTEM The 2-Wire bus system supports operation as a slave only device in a single or multi-slave, and single or multi- master system 128 slave devices may share the bus by uniquely setting the 7-bit slave ...

Page 13

Read/Write Bit The R/W bit following the slave address determines the data direction of subsequent bytes in the transfer. R selects a write transaction, with the following bytes being written by the master to the slave. R/W = ...

Page 14

Write Data Protocol The write data protocol is used to write to register and shadow RAM data to the DS2745 starting at memory address MAddr. Data0 represents the data written to MAddr, Data1 represents the data written to MAddr + ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time Maxim is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Maxim Integrated Products, Inc DESCRIPTION maximum operating range in the Electrical Characteristics voltage” ...

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