100ÿ

VC2

VC1

CW1073

The sample resistance is 200ÿ~1kÿ. If large current balancing is required, an external balancing circuit can be added to expand the current. The balancing current is determined by the external balancing resistor.

Equalization function diagram

Keep low level to keep the discharge MOSFET off; keep CO terminal low level to keep the charge MOSFET on. Sleep state release condition: the battery voltage is higher than the

over-discharge release voltage

(VODR) and lasts longer than the over-discharge release delay time (TODR).

Under normal conditions, if the voltage of any cell is higher than the balancing detection voltage (VBAL) and the voltage of the other cells is lower than the balancing detection voltage (VBAL),

and the balancing start delay time (TBAL) is exceeded, CW1073 starts balancing. Balancing stop conditions: 1.

All cell voltages are lower

than the balancing detection voltage (VBAL). 2. All cell voltages are higher than the

balancing detection voltage (VBAL).

CW1073 enters the over-discharge protection state and exceeds the sleep delay time (TSLP), then CW1073 enters the low power state. DO terminal

CW1073 has built-in balancing function, internal balancing resistor is 100ÿ, and balancing current is adjusted by external voltage sampling resistor.

CW1073 has an optional discharge low temperature protection function. The default discharge low temperature protection temperature setting is the charge low temperature protection temperature of -20ÿ.

2. Determine the charge over-temperature protection threshold, such as

50°C; 3. According to the temperature curve of the NTC resistor, find the resistance value corresponding to 50°C, such as 3.5kÿ; 4. Use a

normal resistor with 10 times the resistance to connect to the ROT terminal, that is, 35kÿ; 5. After determining the

charge over-temperature protection threshold, the discharge over-temperature protection threshold defaults to 50°C+20°C = 70°C; 6. The charge low-

temperature protection setting uses the same method, but the resistor needs to be connected to the RUT terminal; 7. Please refer

to the application circuit for detailed circuits, and set the appropriate protection temperature by selecting resistors;

Voltage sampling and balancing start timing diagram

12

3. CW1073 enters the disconnection protection state, discharge temperature protection state, and low power consumption state.

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CW1073 uses odd-even channel time-sharing balancing. The balancing function does not affect the normal battery voltage sampling. When multiple balancing channels are turned on at the same

time, the odd channels will enter the balancing state first, and the even channels will enter the balancing state in the next cycle. The specific battery voltage sampling and balancing start timing diagram is as

follows:

Equalization function

CW1073

Low power state

8ms

8ms

8ms

48ms

Sampling Waiting

Sampling Waiting

8ms

Sampling Waiting

Even Channel Equalization

Odd channel equalization

Odd channel equalization

Internal equalization circuit

8ms

8ms

Voltage sampling

Voltage sampling

Voltage sampling

8ms

8ms