Battery Management

ZSSC1751

Data Acquisition System Basis Chip (SBC)
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Brief Description

The ZSSC1750 and ZSSC1751 are System Basis Chips (SBCs) with a dual-channel ADC for battery sensing/management in automotive, industrial, and medical systems. The ZSSC1750 and ZSSC1751 feature an SPI interface; in addition, the ZSSC1750 has an integrated LIN 2.1 transceiver.

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.

By simultaneously measuring VBAT and IBAT, it is possible to determine dynamically the internal resistance of the battery, Rdi, which is correlated with the state-of-health (SOH) of the battery. By integrating IBAT, it is possible to determine the state-of-charge (SOC) and the state-of-function (SOF) of the battery.

During Sleep Mode, the system makes periodic measurements to monitor the discharge of the battery. Measurement cycles are controlled by user software and include various wake-up conditions. The ZSSC1750/51 is optimized for ultra-low power consumption drawing only 60μA or less in this mode.

Features
  • Two high-precision 24-bit sigma-delta ADCs (18-bit with no missing codes); sample rate: 1Hz to 16kHz
  • On-chip voltage reference (5ppm/K typical)
  • Current channel
    • IBAT offset error: ≤ 10mA
    • IBAT resolution: ≤ 1mA
    • Programmable gain: 4 to 512
    • Max. differential input stage input range: ±300mV
  • Voltage channel
    • Input range: 4 to 28.8V
    • Voltage accuracy: ±60ppm full-scale range = 1.73mV
  • Temperature channel
    • External temperature sensor (NTC)
    • Factory-calibrated internal temp. sensor: ±2°C
  • LIN 2.1/SAE J2602-1 transceiver (ZSSC1750 only)
  • Typical current consumption
    • Normal Mode: 12mA
    • Sleep Mode: ≤ 60μA
Benefits
  • Integrated, precision measurement solution for accurate prediction of battery state of health (SOH), state of charge (SOC), or state of function (SOF)
  • Robust power-on-reset (POR) concept for harsh automotive environments
  • On-chip precision oscillator accuracy: ±1%
  • On-chip low-power oscillator
  • Only a few external components needed
  • Easy communication via SPI interface
  • Power supply, interrupt, and reset signals for external microcontroller
  • Watchdog timer with dedicated oscillator
  • Industry’s smallest footprint allows minimal module size and cost
  • AEC-Q100 qualified solution
Available Support
  • Evaluation Kit
  • Application Notes
Physical Characteristics
  • Operation temperature up to  -40°C to +125°C
  • Supply voltage: 4.2 to 18V
  • Small footprint package: PQFN36 6x6 mm