Renesas CPU Board M3A-HS19 - Manual (Page 35)

Features and Specifications
2.8 Power Supply Circuit
Rev.1.01 Oct 28, .2008 2-19
REJ10J1351-0101
2
2.8 Power Supply Circuit
The main power supply input 5 V DC to the M3A-HS19 and it generates 3.3 V and 1.8 V using a regulator.
It is an adjustable output voltage regulator to generate a desired voltage by changing resistance values.
A through-hole is provided with the M3A-HS19 to input 1.8 V DC from an external power supply. The PC card power
supply is controlled by software.
Figure 2.8.1 shows the schematic diagram of the power supply circuit.
5 V-IN
(J7)
5 V
3.3 V
5 V
1.8 V
Expansion connector (J12)
SH7619
(U1)
SDRAM
(U3)
Flash
memory
(U2)
JP1
JP3
SW1
1
2
5 V
GND
Regulator (U12)
Regulator (U16)
1
2
1.8 V-IN
(J8)
GND
1
2
Other
logic IC
PB13/BS#
Expansion connector
(J10)
PCMCIA connector
(J4)
EN0
LTC1470
(U5)
EN1
Figure 2.8.1 Power Supply Circuit