S-8261ABRMD-G3RT2G Datasheet, PDF (20/33 Pages) List of Unclassifed Manufacturers – BATTERY PROTECTION IC FOR 1-CELL PACK

BATTERY PROTECTION IC FOR 1-CELL PACK
S-8261 Series
Rev.5.3_00
7. Delay Circuit
The detection delay times are determined by dividing a clock of the approximately 3.5 kHz with the counter.
Remark 1. The detection delay time for overcurrent 2 (t_IOV2) and load short-circuiting (t_SHORT) start when the
overcurrent 1 (V_IOV1) is detected. When the overcurrent 2 (V_IOV2) or load short-circuiting (V_SHORT) is
detected over the detection delay time for each of them (= t_IOV2 or t_SHORT) after the detection of
overcurrent 1 (V_IOV1), the S-8261 Series turns the FET off within t_IOV2 or t_SHORT of each detection.
V_DD
DO pin
V_SS
Overcurrent 2 detection delay time (t_IOV2)
V_DD
VM pin
V_IOV2
V_IOV1
V_SS
Figure 5
t_D
0 ≤ t_D ≤ t_IOV2
Time
Time
2. With power-down function
When the overcurrent is detected and continues for longer than the overdischarge detection delay time
(t_DL) without releasing the load, the status changes to the power-down status when the battery voltage
falls below the overdischarge detection voltage (V_DL). When the battery voltage falls below the
overdischarge detection voltage (V_DL) due to the overcurrent, the S-8261 Series turns the discharging
control FET off by the 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 (t_DL) is still lower than the
overdischarge detection voltage (V_DL), the S-8261 Series shifts to the power-down status.
Without power-down function
When the overcurrent is detected and continues for longer than the overdischarge detection delay time
(t_DL) without released the load, the status changes to the overdischarge status when the battery voltage
falls below overdischarge detection voltage (V_DL).When the battery voltage falls below overdischarge
detection voltage (V_DL) due to the overcurrent, the S-8261 Series turns the discharging control FET off by
the 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 (t_DL) is still lower than the overdischarge detection
voltage (V_DL), the S-8261 Series shifts to the overdischarge status.
20
Seiko Instruments Inc.