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DS2764 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS2764 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 20 page DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface 7 of 20 Figure 2. Block Diagram DETAILED DESCRIPTION The DS2764 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 DS2764 is a key component in applications including remaining capacity estimation, safety monitoring, and battery-specific data storage. Through its 2-Wire interface, the DS2764 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. The 7-bit slave address is field programmable, thus allowing up to 128 devices to be distinctly addressed by the host system. The DS2764 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. EEPROM memory is provided to save important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events. 40 bytes are partitioned into two 16-byte blocks and one 8-byte block. Each block can be individually locked or write protected to provide additional security for unchanging battery data. The lock operation is permanent and thus converts rewritable EEPROM to read only memory. Devices ordered with the unique 64-bit ID option do not have access to the 8 byte block, only the two 16 byte blocks of EEPROM are available. 2-Wire INTERFACE THERMAL SENSE MUX VOLTAGE REFERENCE ADC REGISTERS AND USER MEMORY 25m W SDA CHIP GROUND + - LOCKABLE EEPROM TEMPERATURE VOLTAGE CURRENT ACCUM. CURRENT STATUS/CONTROL Li+ PROTECTION VIN IS1 IS2 SNS IS2 IS1 VSS CC DC PLS PS TIMEBASE INTERNAL SENSE RESISTOR CONFIGURATION ONLY DS2764 SCL |
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