DW01B datasheet(4/8 Pages) FS

4 / 8 page

2016. 03. 26

4/8

Revision No : 0

DW01B

Description of Operation

1. Normal Operation status

The DW01B will run in normal operation status when the battery voltage is in the range from over discharge protection

voltage (VODP) to overcharge protection voltage (VOCP), and the CS pin voltage is in the range from the Charger Detection

Threshold Voltage (VCH) to Over current Protection Voltage (VOI1), Under this status, the charging MOSFET (M2) and

discharging MOSFET (M1) are turned on so that charging and discharging can be carried out normally.

2. Overcharge status

When the battery voltage becomes higher than the overcharge protection voltage (VOCP) during charging in the normal

status and detection continues for the overcharge delay time (TOC) or longer, the charging MOSFET (M2) will be turned

off.

The overcharge status can be released in two cases:

(1) In the case of battery self-discharge, when the battery voltage (VCC) < Overcharge Release Voltage (VOCR), the

charging MOSFET (M2) is turned on and return to the normal status.

(2) In the case when the charger is removed and the load is connected, when the battery voltage (VCC) is in the range from

over discharge release voltage (VOCR) to overcharge protection voltage (VOCP) and the VCS pin voltage is higher than

Over current Protection Voltage (VOI1), the charging MOSFET (M2) is turned on and return to normal status.

3. Over discharge status

When the battery voltage becomes lower than the over discharge protection voltage (VODP) during discharging in the normal

status and detection continues for the over discharge delay time (TOD) or longer, the discharging MOSFET (M1) will be

turned off.

4. Power-down mode after Over discharge

When over discharge occurs, the DW01B will enter into power-down mode, turning off all the timing generation and

detection circuitry to reduce the quiescent current to 0.1μA (

VCC=2.0V). At the same time,

the CS pin is pull -up to VCC through an internal resistor.

5. Release from power-down mode

When the battery is in the over discharge status is connected to a charger, and provided that the CS pin voltage is lower than

the Charger Detection Threshold Voltage (VCH), the DW01B will release from power-down mode and turns on the

discharging MOSFET (M1) when the battery voltage reaches the over discharge protection voltage (VODP ) or higher.

6. Overcurrent / short circuit Protection

In the normal status, when the discharge current is too large, the CS pin voltage is higher than either

VOI1 or VOI2, and continues the

DW01B Datasheet(PDF) 4 Page - First Silicon Co., Ltd