S-8204BAB-TCT1Y Datasheet, PDF (16/36 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC

BATTERY PROTECTION IC FOR 3-SERIES OR 4-SERIES CELL PACK
S-8204B Series
Rev.3.9_00
4. Discharge overcurrent status
In the S-8204B Series, in batteries in the normal status, the discharging current increases more than a certain value.
As a result, if the status in which the VINI pin voltage increases to the level of V_DIOV1 or more, the DOP pin gets the
V_SS level. This is the discharge overcurrent status. At this time, the discharge control FET is turned off and it stops
discharging.
The S-8204B Series has three levels for discharge overcurrent detection (V_DIOV1, V_DIOV2, V_SHORT). In the status of
discharge overcurrent, the COP pin is set in high impedance. The VMP pin is pulled up to the V_DD level by a resistor
between the VMP pin and the VDD pin (R_VMD).
The S-8204B Series' operations against discharge overcurrent detection voltage 2 (V_DIOV2) and load short-circuit
detection voltage (V_SHORT) are as well in V_DIOV1.
The discharge overcurrent status is released if the following condition is satisfied.
(1) The VMP pin voltage gets V_DS −1.2 V (typ.) or more.
5. 0 V battery charge function
In the S-8204B Series, regarding how to charge a discharged battery (0 V battery), users are able to select either
function mentioned below.
(1) Allow to charge a 0 V battery (enable to charge a 0 V battery)
A 0 V battery is charged when the voltage between the VDD pin and the VSS pin (V_DS) is 0 V battery charge
starting voltage (V_0CHA) or more.
(2) Inhibit charging a 0 V battery (unable to charge a 0 V battery)
A 0 V battery is not charged when the battery voltage is 0 V battery charge inhibition battery voltage (V_0INH) or
less.
Caution When the VDD pin voltage is less than the minimum value of operation voltage between the VDD
pin and the VSS pin (V_DSOP), the operation of the S-8204B Series is not assured.
16