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3.2
Power Supply
The power supply can be selected from among three sources shown below by setting the J12 jumper.
• External:
Power is supplied to J11 from an external power.
• VBUS:
Power is supplied to CN1 from USB-VBUS.
• Debug:
Power is supplied to CN3 from the debug probe.
Connector: J12
Power Supply
External(J11)
VBUS(CN1)
Debug(CN3)
Jumper to select power
supply (J12)
Connector (J11) for supplying
external power
micro USB
connector (CN1)
S5U1C31D51T1 Manual
(Rev.1.0)
Table 3.2.1 Power Supply Switching
J12 settings
1-2 Open
3-4 Open
5-6 Short
1-2 Open (Factory Setting)
3-4 Short (Factory Setting)
5-6 Open (Factory Setting)
1-2 Short
3-4 Open
5-6 Open
Figure 3.2.1 Layout of Jumpers for Power Supply Selecting
Seiko Epson Corporation
Remarks
DC +5 V
DC +5 V
DC +5 V
Connector (CN3) for
connecting debug probe
3. Settings
7
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