S-8232 Seiko, S-8232 Datasheet - Page 14

• Manufacturer Part Number: S-8232
• Description: BATTERY PROTECTION IC
• Manufacturer: Seiko

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14
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Delay Circuit
0 V Battery Charging Function
0 V Battery Charge Inhibiting Function
*1. When initially connecting batteries, the IC may fail to enter the normal condition (discharging ready
*2. The products indicated with *4 of the 2. Product Name List in the “
*3. Some lithium ion batteries are not recommended to be recharged after having been completely
The overcharge detection delay time (t
overcurrent detection delay time 1 (t
determine each delay time, delay times are correlated by the following ratio :
The delay times are calculated by the following equations : (Ta = − 40 to + 85 °C)
Remark The delay time for overcurrent detection 2 is fixed by an internal circuit. The delay time cannot
This function is used to recharge both of two serially-connected batteries after they self-discharge to 0 V.
When the 0 V charging start voltage (V
the charger, the charging FET gate is fixed to V
When the voltage between the gate and the source of the charging FET becomes equal to or higher than
the turn-on voltage by the charger voltage, the charging FET turns on to start charging. At this time, the
discharging FET turns off and the charging current flows through the internal parasitic diode in the
discharging FET. If all the battery voltages become equal to or higher than the overdischarge release
voltage (V
This function is used for inhibiting charging when either of the connected batteries goes 0 V due to its
self-discharge. When the voltage of either of the connected batteries goes below 0 V charge inhibit
voltage 1 and 2 (V
possible only when the voltage of both connected batteries goes 0 V charge inhibit voltage 1 and 2
(V
Note that charging may be possible when the total voltage of both connected batteries is less than the
minimum value (V
the connected batteries is 0 V charge inhibit voltage 1 and 2 (V
when the total voltage of both connected batteries reaches the minimum value (V
voltage between VCC and VSS.
When using this optional function, a resistor of 4.7 MΩ is needed between the gate and the source of the
charging control FET (refer to the Figure 8 ).
state). If so, once set the VM pin to VSS voltage (short pins VM and VSS or connect a charger).
to “overcharge detection / release hysteresis”, “no final overcharge function”, and “0 V battery charge
inhibiting function.” The following phenomena may be found, but there is no problem for practical use.
The product is an overcurrent condition due to overload connection when the battery voltage is
overcharge release voltage (V
the IC returns to its normal condition when overload is removed under this condition. However, the
charging FET may be turned OFF when overload is removed under this condition, leading to an
overcharge condition. If so, attach load to start discharge. The charging FET is turned ON to return to
the normal condition. Refer to the “ Overcharge condition ” in this section.
discharged. Please contact the battery manufacturer when you decide to select a 0 V battery charging
function.
0INH1, 2
Overcharge delay time : Overdischarge delay time : Overcurrent delay time = 100 : 10 : 1
Overcharge detection delay time t
Overdischarge detection delay time t
Overcurrent detection delay time t
) or more.
be changed via an external capacitor.
DU1, 2
), the normal condition returns.
DSOPmin
0INH1, 2
) of the operating voltage between VCC and VSS even if the voltage of either of
), the charging FET gate is fixed to "EB−" to inhibit charging. Charging is
*3
CD1, 2
) or more and overcharge detection voltage (V
I0V1
CU
IOV1
Seiko Instruments Inc.
*3
0CHA
[s] = Delay factor
CU1, 2
DD
) change with an external capacitor (C3). Since one capacitor
[s] = Delay factor
[s] = Delay factor ( 0.3045, 0.4545, 0.6409 ) × C3 [µF]
) or higher is applied to between VM and VCC by connecting
), the overdischarge detection delay time (t
CC
potential.
( 2.500,
( 0.02864, 0.04545, 0.06682 ) × C3 [µF]
Min.,
0INH1, 2
Product Name Structure ” are set
) or less. Charging is prohibited
Typ.,
4.545,
Max.
9.364 ) × C3 [µF]
DSOPmin
CU1, 2
) or less. Usually,
) of the operating
DD1, 2
Rev.5.4
), and the
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