S-8253A SII [Seiko Instruments Inc], S-8253A Datasheet - Page 23

• Manufacturer Part Number: S-8253A
• Description: BATTERY PROTECTION IC FOR 2-SERIAL OR 3-SERIAL-CELL PACK
• Manufacturer: SII [Seiko Instruments Inc]

Rev.3.7
CTL
CTLM
DOP
VMP
• In case of designing a circuit by using the CTL pin, as seen in Figure 15, note that discharging may stop during connecting a battery
Precautions
【Cause】
【Mechanism】
pack and the device.
This is because the overcurrent detection voltage 3 (V
battery pack is in the delay time-shortening status.
As seen in Figure 15, before a battery pack is connected to the device, the battery pack may be in the charge / discharge inhibited
status in which the CTL pin is internally pulled-up. From this status, if connecting the battery pack to the device, the CTL pin will be
pulled-down in a time-constant C1 × (R1 + R
V
starts charging a parasitic capacitor in the device. In this case, if the rush current, which makes the S-8253A/B Series to detect the
overcurrent detection voltage 3 (V
shortened. So that the battery pack goes in the overcurrent status in several 10 µs. However, the battery pack goes in the normal
status by connecting the device to the charger.
CTL = H
_00
CTLL
<3>
OFF
<V
CTL
VDD
200 nA
<V
S-8253A/B
CTLH
BATTERY PROTECTION IC FOR 2-SERIAL OR 3-SERIAL-CELL PACK
t
<4>
ON
IOV3
, the battery pack goes in the delay time-shortening status so that it releases charging and discharging, hence it
Rush current
DOP
COP
VMP
CTL
IOV3
Connect battery pack to device
C1
), flows into the device, the overcurrent detection delay time 3 (t
CTL = L
OFF
<2>
Seiko Instruments Inc.
PD
) by a pull-down resistor in the device. If the CTL’s potential reaches
Figure 15
Figure 16
IOV3
Battery pack
R1
) is detected due to the rush current which flows into the device while a
Connect charger
EB+
CTL
EB−
Discharging
ON
<1>
Rush current
Mode
Device
<1> : Normal mode
<2> : Overcurrent mode
<3> : Charge / discharge inhibit mode
<4> : Delay time-shortening mode
(enable to charge / discharge)
S-8253A/B Series
Pull-down
resistor
R
PD
IOV3
= 300 µs typ.) will be
Parasitic
capacitor
23