S-8233C Datasheet, PDF (2/26 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 3-SERIAL-CELL PACK

BATTERY PROTECTION IC FOR 3-SERIAL-CELL PACK
S-8233C Series
Block Diagram
Rev.4.0_00
VCC
CSO
Over
charge
VC1
ISO
Over
current
VC2
Reference
voltage 1
+
-
Battery 1
Over charge
+
-
Battery 1
Over discharge
+
-
Battery 2
Over charge
+
Control
Logic
-
Battery 2
Over discharge
Reference
voltage 2
Over current
2,3 delay
circuit
Over current
detection
circuit
Over current1‚
delay circuit
Over discharge
delay circuit
Over charge
delay circuit
VMP
COVT
CDT
CCT
DOP
DSO
Over
discharge
VSS
+
-
Battery 3
Over charge
+
-
Battery 3
Over discharge
Reference
voltage 3
COP
Floating
CTL
detection circuit
Figure 1
The delay time for over current detection 2 and 3 is fixed by an internal IC circuit. The delay time cannot
be changed via an external capacitor.
If one of the battery voltages becomes higher than the over charge detection voltage (V_CU), the CSO
terminal goes high.
If one of the battery voltages becomes lower than the over discharge detection voltage (V_DD), the DSO
terminal goes high.
If S-8233C series detect over current, the ISO terminal goes high.
In normal state each terminal output ‘Low’.
2
Seiko Instruments Inc.