ZSSC1856

Data Sheet Rev. 1.00 / April 2012 ZSSC1856 Intelligent Battery Sensor IC ZSSC1856 Intelligent Battery Sensor IC Brief Description The ZSSC1856 is a dual-channel ADC with an embedded microcontroller for battery sensing/management in automotive, industrial, and medical systems. One of the two input channels measures the battery current IBAT via the voltage drop at the external shunt resistor. The second channel measures the battery voltage VBAT and the temperature. An integrated flash memory is provided for customer-specific software; e.g., dedicated algorithms for calculating the battery state. During Sleep Mode (e.g., engine off), the system makes periodic measurements to monitor the discharge of the battery. Measurement cycles are controlled by the software and include various wakeup conditions. The ZSSC1856 is optimized for ultralow power consumption and draws only 100µA or less in this mode. Features  High-precision 18-bit sigma-delta ADC with on-chip voltage reference (5ppm/K)  Current channel  IBAT offset error: ≤ 10mA  IBAT resolution: ≤ 1mA  Programmable gain: 4 to 512  Differential input stage input range: ± 300mV  Sampling rate: 1Hz to 16kHz  Voltage channel  Input range: 4 to 28.8V  Voltage accuracy: ± 2mV  Temperature channel  Internal temperature sensor: ± 2°C  External temperature sensor (NTC)  On-chip precision oscillator (1%)  On-chip low-power oscillator  ARM® Cortex™-M0* microcontroller: 32-bit core, 10MHz to 20MHz  96kB Flash/EE Memory wit...