Features: Lithium-Ion (Li+) Safety Circuit
- Overvoltage Protection
- Overcurrent/Short-Circuit Protection
- Undervoltage Protection
Zero Volt Battery Recovery Charge
Available in Two Configurations:
- Internal 25m Sense Resistor
- External User-Selectable Sense Resistor
Current Measurement
- 12-Bit Bidirectional Measurement
- Internal Sense Resistor Configuration: 0.625mA LSB and ±1.9A Dynamic Range
- External Sense Resistor Configuration: 15.625V LSB and ±64mV Dynamic Range
Current Accumulation:
- Internal Sense Resistor: 0.25mAhr LSB
- External Sense Resistor: 6.25Vhr LSB
Voltage Measurement with 4.88mV Resolution
Temperature Measurement Using Integrated Sensor with 0.125C Resolution
System Power Management and Control Feature Support
32 Bytes of Lockable EEPROM
16 Bytes of General-Purpose SRAM
Dallas 1-Wire® Interface with Unique 64-bit Device Address
Low Power Consumption:
- Active Current: 60A typ, 90A max
- Sleep Current: 1A typ, 2A maxPinout
SpecificationsVoltage on PLS and CC Pin, Relative to VSS .............................-0.3V to +18V
Voltage on PIO Pin, Relative to VSS.......................................... -0.3V to +12V
Voltage on VIN and PS, Relative to VSS............................. -0.3V to VDD + 0.3
Voltage on any Other Pin, Relative to VSS.................................. -0.3V to +6V
Continuous Internal Sense Resistor Current............................................2.5A
Pulsed Internal Sense Resistor Current ....50A for <100µs/sec, <1000 pulses
Operating Temperature Range............................................. -40°C to +85°C
Storage Temperature Range............................................... -55°C to +125°C
Soldering Temperature ............................................See IPC/JEDECJ-STD-020A
* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
DescriptionThe DS2761 high-precision Li+ battery monitor is a data-acquisition, information-storage, and safetyprotection device tailored for cost-sensitive battery pack applications. This low-power device integrates precise temperature, voltage, and current measurement, nonvolatile (NV) data storage, and Li+ protection into the small footprint of either a TSSOP package or flip-chip package. The DS2761 is a key component in applications including remaining capacity estimation, safety monitoring, and battery-specific data storage.
Through its 1-Wire interface, the DS2761 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each device has a unique factoryprogrammed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery operation.
The DS2761 is capable of performing temperature, voltage, and current measurement to a resolution sufficient to support process monitoring applications such as battery charge control, remaining capacity estimation, and safety monitoring. Temperature is measured using an on-chip sensor, eliminating the need for a separate thermistor. Bidirectional current measurement and accumulation are accomplished using either an internal 25m sense resistor or an external device. The DS2761 also features a programmable I/O pin that allows the host system to sense and control other electronics in the pack, including switches, vibration motors, speakers, and LEDs.
Three types of memory are provided on the DS2761 for battery information storage: EEPROM, lockable EEPROM, and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events. Lockable EEPROM becomes ROM when locked to provide additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data.
DS2761 Data Sheet
