BATTERY PROTECTION IC FOR 1-CELL PACK
S-8211C Series
Rev.5.0_00
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 turns the discharging
control FET off within tSHORT from the time of detecting VSHORT
.
VDD
DO Pin
tD
0 ≤ tD ≤ tSHORT
Time
VSS
Load short-circuiting detection delay time (tSHORT
VDD
)
VSHORT
VM Pin
VDIOV
VSS
Time
Figure 10
2. 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 is still lower than the overdischarge detection voltage, S-8211C Series shifts to the power-down
status.
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Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
