Renesas M3A-HS37 사용자 설명서

Functional Specifications

2.6 Power Supply Module

Rev.1.00 Oct 09, 2008

2-10

REJ11J0021-0100

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.

Power
supply

connector

Expansion connector

Power switch

External
power supply

5 VCC

3 VCC

5 V to
3.3 V

CPU-VCC

VCC

AVCC

SH7137

SRAM

5 VCC

AVREFH

J8 connector

Expansion connector

5 VCC

AVCC

AVREF

J8 connector

JP4

JP5

JP2

Optional

CPU power supply

select jumper (JP1)

DC power jack

5V DC

Input

VCC

AVREFL

VSS

AVSS

Figure 2.6.1 Power Supply Circuit Block Diagram