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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.
Expansion connector (J12)
5 V-IN
SW1
(J7)
1
2
GND
1.8 V-IN
(J8)
1
2
GND
Rev.1.01 Oct 28, .2008
REJ10J1351-0101
5 V
1
2
Flash
memory
Regulator (U12)
(U2)
5 V
3.3 V
SH7619
(U1)
Regulator (U16)
JP3
5 V
1.8 V
Figure 2.8.1 Power Supply Circuit
Other
SDRAM
logic IC
(U3)
EN1
JP1
PB13/BS#
EN0
Features and Specifications
2.8 Power Supply Circuit
Expansion connector
(J10)
LTC1470
PCMCIA connector
(U5)
(J4)
2-19
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