Board features
The main features of FRDM33772CSPEVB are:
• Standard SPI communication
• LED indicator for operation mode
• Cell-balancing resistors
• Cell sense input with RC filter
• General-purpose input/output (GPIO): digital I/O, wake-up inputs, convert trigger inputs,
ratiometric analog inputs, analog inputs with absolute measurements
• EEPROM (connected to the IC with I2C-bus interface) to store user-defined calibration
parameters
• Fault detection pin report
• Current measurement input via external shunt
Device features
The MC33772C is a battery cell controller IC designed to monitor battery characteristics,
such as voltage, current, and temperature. The MC33772C contains all the circuit blocks
necessary to measure synchronous battery cell voltage/current, coulomb counting,
cell temperature measurement, and integrated cell balancing. The device supports the
following functions:
Board description
The FRDM33772CSPEVB allows the user to exercise all the functions of the MC33772C
battery controller cell.
It is stacked onto an S32K144EVB. SPI communication is done through connector K1
to K6. The FRDM33772CSPEVB is supplied when connected to a battery cell stack
through connector J12. The S32K144EVB is supplied through its USB connection when
connected to a PC.
The VCOM LED indicates when the device is in normal mode. Upon reset, the
MC33772C enters init mode (VCOM turns on). If there is no activity on the bus after a
timeout period of 60 s, the device enters low-power idle mode (VCOM turns off). Once
the device is initialized, if no communication occurs on the transformer physical layer
(TPL) bus after 1 s, the device resets, and the LED turns off after the 60 s timeout period
(VCOM off).