Features: ` Provides all identification, information, instrumentation and protection functions needed in a lithium-ion battery pack
` Supports two-cell battery packs
` Protects cells from:
overvoltage (overcharge)
undervoltage (overdischarge)
overcurrent (charging and discharging)
high temperatures (thermal runaway)
` Built-in cell-balancing support circuitry
` Current accumulator tracks remaining battery capacity in 0.5% increments
` Voltage measurement with 10 mV accuracy
` Temperature measurement with ±2°C accuracy eliminates need for thermistor
` 32-byte user memory stores battery data
` 64-bit ROM ID uniquely identifies each battery pack
` 1-Wire™ interface carries all commands and data via a single wire
` Programmable alarm warns when cells are nearly discharged
` Programmable I/O pin supports LEDs, vibration motors and other features
` Operating temperature range: -40°C to +85°C
` 10kV ESD ratingPinout
SpecificationsVoltage on CHG pin, Relative to Ground -0.3V to +18V
Voltage on VDD, DCHG, DQ, PIO, Relative to Ground -0.3V to +12V
Voltage on any other pin, Relative to Ground -0.3V to +7V
Operating Temperature -40°C to +85°C
Storage Temperature -55°C to +125°C
Soldering Temperature 260°C for 10 secondsDescriptionThe DS2442 2-Cell Li-Ion Battery Manager provides all essential functions for monitoring, protecting and managing two-cell lithium-ion battery packs. The DS2442 constantly measures cell voltages, current, and temperature, and automatically takes action to disable charging and/or discharging of the cells to protect them when undesirable conditions arise.
Via its 1-Wire interface, the DS2442 provides the host system access to identification information, status data, configuration and control settings, instrumentation registers, and general purpose data storage. Each DS2442 has a factory-programmed 64-bit ROM ID which allows the host system to verify the authenticity of the battery pack as well as a factory-programmed 16-bit manufacturing ID which can be used to encode assembly location, cell chemistry and other information. A full set of status information in the DS2442 keeps the host informed about protection conditions, remaining capacity and other matters. Configuration and control fields in the device allow the host to disable charging and/or discharging, put the battery pack in a low-power mode, implement cell balancing, and set various timing parameters. In addition, instrumentation registers on the chip present the host with high-accuracy temperature, voltage, and current measurements as well as information on remaining capacity and cycle life. Thirty-two bytes of general purpose memory in the DS2442 are available for storing pack-specific information. When either cell voltage reaches the undervoltage cutoff, the DS2442 automatically enters a low-power mode in which it consumes only 1A of battery current.
When a battery charger is applied to the pack, the DS2442 automatically leaves its low-power mode to support charging. A refresh feature in the DS2442 allows even the most severely discharged battery packs to be refreshed and recharged. The DS2442 also features a programmable I/O pin that allows the host system to sense and control other electronics in the pack, such as vibration motors, speakers and LEDs.
DS2442 Data Sheet
