M61047FP

Rev.2.00 Mar 04, 2005 page 13 of 23

Series Regulator

Series regulator is shown in Figure 5. Pch MOS transistor is used for output driver.

The output voltage can be adjusted by M61047FP itself. So the external resistor is not required.

Usually, although series regulator is 3.3 V output, it is possible to change to 5 V output by register setup at the time of

flash memory rewriting of microcomputer.

Note: There is a diode put between Vcc and Vreg terminal to prevent the invert current from damaging this IC when

Vcc Voltage is higher than Vreg voltage. So please always keep Vreg voltage lower than Vcc+0.3 V. Set a

condenser on output to suppress input changes or load changes.

In order to suppress input change and load change, please attach a 0.47

µF capacitor to VREG output. Regard

10 ms as the standard of settling time by input change/load change/output change.

+

–

S52

S51

VREF

GND

R1

R2

R3

Serial to Parallel

conversion circuit

VREG

VCC

Switch control

Figure 5 Series Regulator