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 Integrated Device Technology

  • Data Acquisition System Basis Chip for Battery Management

  • Created: May 10, 2016

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As its name suggests, a System Basis Chip (SBC) is an integrated circuit that comprises of different functions of automotive Electronic Control Units (ECU) on a single chip. This usually consists of digital functions like communication bus interfaces and analog or power supply functionality. Also, this is also consisted of embedded functions such as voltage regulators, supervision functions, reset generators, watchdog functions, LIN and CAN bus interfaces, wake-up logic, power switches. This reference design features ZSSC1750 data acquisition system basis chip with a dual-channel Analog-to-Digital Converter (ADC) for battery sensing/management. The ZSSC1750 has an SPI interface in addition to its integrated LIN 2.1 transceiver.

This circuit is specifically designed for battery management applications. It has 2 high-precision 24-bit sigma-delta ADCs. It has also an on-chip voltage reference typically 5ppm/K. This design operates in the range of 4.2V to 18V. 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. This is also integrated with precision measurement solution for accurate prediction of battery state of health (SOH), state of charge (SOC), or state of function (SOF). By simultaneously measuring Vbat and Ibat, it is possible to determine dynamically the internal resistance of the battery, Rdi, which is correlated with SOH of the battery. By integrating Ibat, it is possible to determine the SOC and the state-of-function SOF of the battery.

This design is applicable in a broad range of high precision data acquisition and battery management applications. This is very vital in the automotive applications such as e-bikes, scooters, and e-carts. Also, it is very useful in battery monitoring in industrial, medical and photovoltaic applications.