Filter
Top Products
Operational Specifications
3.2.2 External Power Supply Select Jumper (JP2, JP3, JP4, JP5)
Rev.1.04
2008.7.10
3-20
REJ10J1564-0104
3
3.2.2 External Power Supply Select Jumper (JP2, JP3, JP4, JP5)
By setting JP2 to JP5, the source of power voltage supplying to A/D reference power supply (AVREF), analog
power supply (AVCC), USB power supply (DrVCC), and system power supply of SH7285 can be switched.
Figure 3.2.3 shows the external power supply select jumper assignments. Table 3.2.2 lists the external power
supply select jumper setting.
Top view of the
component side
12
CPU-VCC SEL
FIX INT
JP2
12
DrVCC SEL
FIX INT
JP3
1
2
AVCC SEL
FIX AVCC
JP4
1
2
AVREF SEL
FIX AVREF
JP5
Figure 3.2.3 External Power Supply Select Jumper Assignments (JP2,JP3,JP4,JP5)
Table 3.2.2 External Power Supply Select Jumper Setting (JP2,JP3,JP4,JP5)
Jumper Setting Function
1-2
SH7285 power supply voltage (VCC) is supplied from J4 or J7
JP2
CPU-VCC SEL
Open External power supply voltage (supplied from J5 or H13)
1-2
SH7285 USB power supply (DrVCC) is supplied from J4 or J7 (via regulator)
JP3
DrVCC SEL
Open External power supply voltage (supplied from J6 or H14)
1-2
SH7285 AVCC is connected to 5V fixed power supply voltage.
JP4
AVCCSEL
Open External power supply voltage (supplied from J8 or H8)
1-2
SH7285 AVREF is connected to 5V fixed power supply voltage.
JP5
AVREFSEL
Open External power supply voltage (supplied from J8 or H9)
: Initial Setting
Note: Do not change jumper settings during the operation of M3A-HS85.
Ensure to turn off the power for the M3A-HS85 before changing jumper settings.