Power Supply Module - Renesas M3A-HS37 User Manual

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2.6 Power Supply Module

The M3A-HS37 is supplied +5 V power and the voltage regulator on the board generates +3.3 V. LM2738YMY is the output
voltage adjustable regulator and the desired voltage value can be generated by changing the resistance value. +5 V power is
supplied from the DC regulated power supply (via the power connector, J4) or AC adapter (via the DC power jack, J7).
The SH7137 system power supply (VCC) can be switched to +3.3 V or +5 V by 3V/5V select jumper (JP1) setting (default: 5V).
When switching the VCC, note that the following:
･The conversion voltages between 5 V and 3 V are supplied to the RCAN interface as appropriate.
･Both +5 V and +3 V are available on the CPU and SRAM (part number: 5M5256DFP-VP70GI).
･The supply voltage supplied to the CPU is also supplied to SRAM.
･Always +5 V is supplied to the SH7137 A/D converter.
The SH7137 system power supply (VCC), A/D power supply (AVCC), and AVREF power supply can be supplied from external
power supply, respectively.
Figure 2.6.1 shows the M3A-HS37 power circuit block diagram.
J4
Power switch
Power
supply
connector
5V DC
Input
J7
DC power jack
Rev.1.00 Oct 09, 2008
REJ11J0021-0100
Expansion connector
5 VCC
5 VCC
CPU power supply
select jumper (JP1)
5 VCC
1
JP
3
5 VCC 5 V to
3 VCC
3.3 V
Expansion connector
Figure 2.6.1 Power Supply Circuit Block Diagram
AVCC
J8 connector
JP4
AVREF
J8 connector
JP5
External
power supply
2
VCC
CPU-VCC
JP2
SRAM
Optional
Functional Specifications
2.6 Power Supply Module
SH7137
AVCC
AVREFH
AVREFL
AVSS
VCC
VSS
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