How to design the monitoring circuit of lithium-ion battery pack?

　　Intersil's ISL94203EVAL1Z is a toolkit to facilitate testing of the ISL94203 lithium-ion battery pack monitoring and control integrated circuit. ISL94203 monitors battery voltage, current and temperature. It takes 12-bit digital values of battery voltage, current and temperature, provides balance control, and provides complete independent battery operation. ISL94203 is independent by default and can be overridden by an external microcontroller. The PC graphical user interface (GUI) supports the required hook monitoring independent of the microcontroller for external operations and demonstration operations.

　　Intersil’s ISL94203EVAL1Z is a toolkit to facilitate testing of the ISL94203 lithium-ion battery pack monitoring and control integrated circuit. ISL94203 monitors battery voltage, current and temperature. It takes 12-bit digital values of battery voltage, current and temperature, provides balance control, and provides complete independent battery operation. ISL94203 is independent by default and can be overridden by an external microcontroller. The PC graphical user interface (GUI) supports the required hook monitoring independent of the microcontroller for external operations and demonstration operations.

　　Circuit characteristics

　　Battery voltage monitoring supports lithium-ion independent package control-does not require single-chip microcomputer, multiple voltages and programmable detection/recovery, meets the conditions of over-voltage, under-voltage, over-current and short-circuit, in the configuration maintenance/calibration register, open battery connection detection, The integrated charge/discharge field effect transistor drive circuit is built-in, and the charge pump supports high-end n-channel field effect transistors. It balances use of external field effect transistors and internal state machines or external microcontrollers, and enters a low power consumption state after a period of inactivity. The charging or discharging current detection returns to the normal scan rate.

　　Function description

　　The purpose of this integrated circuit is to become an independent battery monitor, so it does not use an external microcontroller that provides monitoring and protection functions. The power control field effect transistor of the positioning part is higher, and the built-in charge pump drives the n-channel field effect transistor. The current detection resistance is also high. The power is to minimize all areas, part of the circuit power most of the time, and extend battery life. At the same time, the RGO output stays on any connected microcontroller and can stay on most of the time. ISL94203 includes: input level shifter to monitor battery stack voltage, 14-bit ADC converter, voltage reading trimming and result saving as 12-bit, 1.8v voltage reference (0.8% accurate), .5v regulator, and volt age keeping at Sleeping