If the SEL terminal is connected to the ground with a resistor in series, the number of battery strings protected by CW1073 is 6. When 6 battery strings are used, the VC7 terminal and the VC6 terminal are shorted.

13

The VDD voltage of CW1073 is higher than the 0V charging start voltage (VOV), a charger is connected and the charger output voltage is higher than the charging MOSFET

If the SEL terminal is left unconnected, the number of battery strings protected by CW1073 is 7;

Level time.

The delay time refers to the time from when CW1073 detects that the voltage reaches the set protection threshold to when CW1073 drives the CO or DO terminal to output high or low.

In the application of charging and discharging at the same port, the battery pack is in the overcharge and charging temperature protection state. If the CS terminal detection voltage is higher than

3.5mV and the discharge state detection delay (TDCH) continues , the battery pack is considered to be in the discharge state, and the CO terminal outputs a low level to turn on the charging MOSFET.

When the internal protection state of the CW1073 chip occurs, such as over-discharge, over-current, discharge over-temperature and disconnection protection, the chip protection action will be

executed first.

The SEL terminal is the battery series number selection terminal, which can be used to select the number of batteries connected in series.

The overcurrent 1 and overcurrent 2 protections of CW1073 can be set with external capacitors to set the delay time.

CW1073 includes disconnection detection and protection functions.

Under normal conditions, when the detection line of any battery in the battery pack is disconnected and maintained for more than the disconnection detection delay (TOW), the DO terminal

and DO_PWM terminal output low level to turn off the discharge MOSFET; CO output high impedance to turn off the charging MOSFET; CW1073 enters the disconnection protection state. Conditions

for releasing the

disconnection protection state: VM terminal

voltage is lower than 2V (load release), the detection line is reconnected, and maintained for more than the disconnection release delay (TOWR), the disconnection protection state is released.

CW1073 has built-in MOS drive function, supports external PWM signal to control DO_PWM terminal output through DCTRL terminal, DCTRL terminal input voltage is higher than 2.5V,

DO_PWM terminal outputs low level; DCTRL terminal input voltage is lower than 1V, DO_PWM terminal outputs high level. When external signal is not needed to control DO_PWM terminal, DCTRL

terminal series resistor is grounded;

© 2017-2019 Cellwise Microelectronics

CW1073 supports the battery 0V charging function, that is, when the battery voltage is lower than the normal operating voltage of the chip, the battery pack can be charged normally.

catch;

0V

charging (allowed)

The battery pack starts charging after the threshold

is turned on. Delay time setting

Line break protection function

CW1073

String number selection

Discharge status detection function

PWM

control drive