S-8235AAA-TCT1U Datasheet, PDF (11/24 Pages) Seiko Instruments Inc – FOR AUTOMOTIVE BATTERY PROTECTION IC

FOR AUTOMOTIVE BATTERY PROTECTION IC FOR 3-SERIAL TO 5-SERIAL CELL PACK (SECONDARY PROTECTION)
Rev.1.7_00
S-8235A Series
3. Overcharge timer reset function
The S-8235A Series has an overcharge timer reset function.
If overcharge release noise which temporarily falls below overcharge detection voltage n (V_CUn) is input during
overcharge detection delay time (t_CU) from when the voltage of one of the batteries during a charging operation exceeds
V_CUn until when charging is stopped, t_CU is continuously counted if the time of overcharge release noise is shorter than
overcharge timer reset delay time (t_TR). On the other hand, under the same status, if the time of overcharge release
noise is t_TR or longer, counting of t_CU is reset once. After that, when V_CUn is exceeded, counting t_CU resumes.
V_HCn
t_TR or
shorter
t_TR or
longer
t_TR or
shorter
V_CUn
Battery voltage
(n = 1 to 5)
CO pin
t_CU or
shorter
t_TR
Timer reset
t_CU
Figure 6 Overcharge Timer Reset Operation
4. Status of pins
The status of pins for the S-8235A Series is shown in Table 6.
When inputting "H" to the CTL pin, the CO pin outputs "H" in 1.0 ms typ. at normal status, and maintains "H" at
overcharge status. Each of the RSTO pin, the CLKO pin, and the CAO pin outputs a signal in 1.0 ms typ. from inputting.
When performing a self-test operation, input "L" to the RSTI pin. Refer to " Self-test Function" for the self-test
operation.
I/O
Input
Symbol
RSTI
CTL
CLKI
CAI
CO
Output RSTO
CLKO
CAO
Table 6
Normal Operation
"H"
"H"
"L"
"H"
"L"
"H"
"L"
"H" "L" "H" "L" "H" "L" "H" "L"
"H"
"L" (Normal status) /
"H" (Overcharge status)
"H"
"H"
"L"
Self-test Operation
"L"
"H"
"L"
"H"
"L"
"H"
"L"
"H" "L" "H" "L" "H" "L" "H" "L"
"H"
"L" (Normal status) /
"H" (Overcharge status)
Refer to "2. RSTO pin" in " Self-test Function"
Refer to "3. CLKO pin"in" Self-test Function"
Refer to "4. CAO pin" in " Self-test Function"
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