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9
CHARGE CONTROL IC501 outputs status signals shown in Table.2-4 while charging. In this unit, only XSTAT1 signal is used. This means that System Controller IC400
monitors if IC501 is charging or not.
Table.2-4 Status signal
IC501 Pin-2 [XSTAT1]
IC501 Pin-3 [XSTAT2]
Status
L
L
When pre-charging
L
Open
When normal-charging
Open
L
When the charging operation terminates
Open
Open
Error Status
Battery is not connected
Detecting the abnormal temperature
Detecting the timer fault
Etc.
Table.2-5 Monitoring the charging operation by SYSTEM CONTROLLER IC400
IC400 Pin-85 [PF4]
Status
L
When charging
H
When the charging operation terminates
Table.2-6 Charging Current
Power Source
Pre-charging
(Until BATT voltage becomes 3[V])
(Until BATT voltage becomes 3[V])
Constant-Current Charging
Remark
USB (500mA – Permit)
Approx. 50mA
Approx. 430mA
Varies depending on conditions. The left
values are when connecting with PC
without transferring data
values are when connecting with PC
without transferring data
USB (100mA – Permit)
Approx. 50mA
Approx. 90mA
Varies depending on conditions.
Note:
The actual charging current of USB charge varies depending on the system conditions. It will be as follows.
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
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