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© 2021 ROHM Co., Ltd.
No. 64UG016E Rev.001
MAY.2021
User’s Guide
BD71631QWZ-EVK-001
Charging State
Below is a charging state of BD71631QWZ.
V
BAT
Time
Charge
(CC)
(CV)
Charge Current
Battery Voltage
I
BAT
V
CHG
I
CHG
I
TERM
Charge Stop
15 s
Charge
Stop
10 hour Safety Timer Counting
LED_OFF
LED_ON
LED_OFF
I
PRE
= I
CHG
/ 2
V
PRE
LEDCNT
Figure 3. Charging profile
Charging stop section on the left in Figure 3 is in the state of SUSPEND in Figure 4, and charging is stopped.
In the Charge section, charging starts and the charging current I
PRE
or I
CHG
flows.
The Pre-charge current I
PRE
flows until the battery voltage reaches the Pre-charge voltage V
PRE
.
I
PRE
is I
CHG
/ 2 that is charged at
Constant Current (CC) and the charging current I
PRE
flows.
When the battery voltage reaches the Pre-Charge voltage V
PRE
, it is charged at Constant Current (CC) and the charging current I
CHG
flows.
When the battery voltage reaches the V
CHG
voltage, it is charged at Constant Voltage (CV) and the charging current decreases.
When the charging current reaches the Termination current I
TERM
, it will be in the TOP-OFF state, and after 15 seconds have
passed, it will be in the DONE state.
SUSPEND
CHARGE
①
TOP_OFF
②
③
TEMP_ERROR_1
TEMP_ERROR_2
⑦
⑧
BATTERY_ERROR
⑤
DONE
④
⑥
ALL State
⑨
⑤
⑤
⑤
⑦
⑧
Figure 4. Charging state
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