S-8211CDG-M5T1U datasheet(24/43 Pages) ABLIC

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BATTERY PROTECTION IC FOR 1-CELL PACK

S-8211C Series

Rev.7.7_03

8. Delay circuit

The detection delay times are determined by dividing a clock of approximately 3.5 kHz by the counter.

Remark 1. The discharge overcurrent detection delay time (tDIOV) and the load short-circuiting detection delay time

(tSHORT) start when the discharge overcurrent detection voltage (VDIOV) is detected. When the load short-

circuiting detection voltage (VSHORT) is detected over the load short-circuiting detection delay time (tSHORT)

after the detection of discharge overcurrent detection voltage (VDIOV), the S-8211C Series turns the

discharging control FET off within the load short-circuiting detection delay time (tSHORT) from the time of

detecting VSHORT.

DO Pin

VM Pin

VDD

Time

VDIOV

VSS

VSHORT

Load short-circuiting detection delay time (tSHORT)

Time

 tD  tSHORT

Figure 10

2. With power-down function

When any overcurrent is detected and the overcurrent continues for longer than the overdischarge

detection delay time (tDL) without the load being released, the status changes to the power-down status at

the point where the battery voltage falls below overdischarge detection voltage (VDL).

When the battery voltage falls below overdischarge detection voltage (VDL) due to overcurrent, the

S-8211C Series turns the discharging control FET off via overcurrent detection. In this case, if the

recovery of the battery voltage is so slow that the battery voltage after the overdischarge detection delay

time (tDL) is still lower than the overdischarge detection voltage (VDL), the S-8211C Series shifts to the

power-down status.

Without power-down function

When any overcurrent is detected and the overcurrent continues for longer than the overdischarge

detection delay time (tDL) without the load being released, the status changes to the overdischarge status

at the point where the battery voltage falls below overdischarge detection voltage (VDL).

When the battery voltage falls below overdischarge detection voltage (VDL) due to overcurrent, the

S-8211C Series turns the discharging control FET off via overcurrent detection. In this case, if the

recovery of the battery voltage is so slow that the battery voltage after the overdischarge detection delay

time (tDL) is still lower than the overdischarge detection voltage (VDL), the S-8211C Series shifts to the

overdischarge status.

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