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DS2762BR Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS2762BR Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 25 page DS2762 High-Precision Li+ Battery Monitor With Alerts 7 of 25 Figure 1. Block Diagram DETAILED DESCRIPTION The DS2762 high-precision Li+ battery monitor is a data-acquisition, information-storage, and safety-protection 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 DS2762 is a key component in applications including remaining capacity estimation, safety monitoring, and battery-specific data storage. Through its 1-Wire interface, the DS2762 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each device has a unique factory-programmed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery operation. The DS2762 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 W sense resistor or an external device. The DS2762 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. This pin may also be used to alert the host when preset accumulated current or temperature limits are exceeded. Three types of memory are provided on the DS2762 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. 1-Wire INTERFACE AND ADDRESS THERMAL SENSE MUX VOLTAGE REFERENCE ADC REGISTERS AND USER MEMORY 25m W DQ CHIP GROUND + - LOCKABLE EEPROM SRAM TEMPERATURE VOLTAGE CURRENT ACCUM. CURRENT STATUS/CONTROL Li+ PROTECTION VIN IS1 IS2 SNS IS2 IS1 VSS CC DC PLS PS PIO TIMEBASE INTERNAL SENSE RESISTOR CONFIGURATION ONLY DS2762 |
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