DS2770

Integrated charge controller supporting both rechargeable lithium and NiMH battery technologies
Available in two configurations: Internal 25m current-sense resistor External user-selectable sense resistor
Current measurement: 15-bit bidirectional measurement Internal sense resistor configuration:62.5A LSB and±2A dynamic range External sense resistor configuration:1.56V LSB and ±51.2mV dynamic range
Current accumulation Internal sense resistor: 0.25mAh LSB External sense resistor: 6.25Vh LSB
Voltage measurement with 4.88mV resolution
Temperature measurement using integrated sensor with 0.125°C resolution
40 bytes of lockable EEPROM
16 bytes of general-purpose SRAM
42-day timer
Dallas 1-Wire® interface with 64-bit ID
1.8V logic levels
Low power consumption: Active current:80A typical Sleep current:0.5A typical

Voltage on VIN, Relative to Ground                    -0.3V to VDD + 0.3V
Voltage on VCH, CC , UV                                    -0.3V to +18V
Voltage on Any Other Pin, Relative to Ground    -0.3V to +6V
Current Max Iol CC , UV                                      20mA
Continuous Internal Sense Current                    ±2.5A
Pulsed Internal Sense Current                            ±50A for <100s/sec, <1000 pulses
Operating Temperature Range                            -40°C to +85°C
Storage Temperature Range                               -55°C to +125°C
Soldering Temperature                                        See IPC/JEDEC J-STD-020ASpecification

The DS2770 battery monitor and charge controller performs several functions needed for thorough battery maintenance. When used in conjunction with the host system's processor, a battery-pack resident DS2770 may be utilized for applications that incl ude charging, remaining capacity estimation, safety monitoring, and nonvolatile (NV) parametric storage.The DS2770 provides a unique ID, a digital temperature sensor, an analog-to-digital converter (ADC) that measures battery voltage and current, an integrated current accumulator that keeps a running total of all current entering and leaving the battery, an elapsed time meter, NV memory for storage of important parameters, and an integrated charge controller supporting rechargeable lithium (including lithium-ion and lithium-ion polymer) and nickel metal hydride (NiMH) batteries. Current measurement can be accomplished through the use of an integrated 25m