S-8233B Datasheet, PDF (15/26 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC (FOR A 3-SERIAL-CELL PACK)

Rev.4.2_00
BATTERY PROTECTION IC FOR 3-SERIAl-CELL PACK
S-8233B Series
Table.5 Output voltage & current consumption by CTL terminal voltage.
Statements
Normal &Over voltage state
Power down mode
(Without charger)
CTL terminal voltage
High & Floated
Low
High
Low
Floated
CTL logic “normal” COP (Charge control)
High
Comply with battery voltage
High
Low
Unknown
S-8233BA
S-8233BC
S-8233BE
DOP (Discharge control)
Current consumption
High
Typ.20 μA
Comply with battery voltage
High
High
High
Typ.20 μA
Typ. 1 nA Typ. 1 nA Unknown
CTL logic “reverse”
S-8233BB
COP
Comply with
battery voltage
High
Low
High
Unknown
S-8233BD
DOP
Comply with
battery voltage
High
High
High
High
Current consumption
Typ.20 μA
Typ.20 μA
Typ. 1 nA Typ. 1 nA Unknown
0 V battery charging function
This function is used to recharge the three serially-connected batteries after they self-discharge to 0 V.
When the 0 V charging start voltage (V_0CHAR) or higher is applied to between VMP and VSS by connecting
the charger, the charging FET gate is fixed to V_SS potential.
When the voltage between the gate sources 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 over discharge release
voltage (V_DU), the normal condition returns.
Caution: In the products without 0 V battery charging function, the resistance between VCC and
VMP and between VSS and VMP are lower than the products with 0 V battery charging
function. It causes to that over charge detection voltage increases by the drop voltage
of R5 (see Figure 9 for a connection example) with sink current at VMP.
The COP output is undefined below 2.0 V on VCC-VSS voltage in the products without
0 V battery charging function.
Voltage temperature factor
Voltage temperature factor 1 indicates over charge detection voltage, over charge release voltage, over
discharge detection voltage, and over discharge release voltage.
Voltage temperature factor 2 indicates over current detection voltage.
The Voltage temperature factors 1 and 2 are expressed by the oblique line parts in Figure 5.
Ex. Voltage temperature factor of over charge detection voltage Typ.
V_CU
[V]
+1 mV/°C
V_CU25
V_CU25 is the over charge detection voltage at 25°C
−1 mV/°C
−20
25
70
Ta [°C]
Figure 5
Seiko Instruments Inc.
15