S1740 datasheet(21/47 Pages) SII

21 / 47 page

POWER MONITORING OUTPUT, 5.5 V INPUT, 100 mA CMOS VOLTAGE REGULATOR WITH 0.5

μA SUPER LOW CURRENT CONSUMPTION

Rev.1.2_00

S-1740/1741 Series



Typical Application in S-1740/1741 Series A / C Type

Figure 20 shows the circuit diagram of the typical application in the S-1740/1741 Series A / C type, and Figure 21 shows

the timing chart.

As shown in Figure 20, connect the PMOUT pin to an analog input pin (AIN pin) of the A/D converter in the

microcontroller. The microcontroller can monitor the battery voltage by inputting the output voltage (VPMOUT) to the A/D

converter.

The input voltage from the battery is converted to output voltage by the regulator operation, and the microcontroller starts

driving with the voltage. The power monitoring output can be controlled by inputting "H" and "L" signals output from the

microcontroller I/O pin to the PMEN pin. Control the power monitoring output according to the A/D converter operation

timing.

When inputting "H" to the PMEN pin in the S-1740/1741 Series A type, or "L" to the PMEN pin in the C type, the

microcontroller monitors the battery voltage. The IC current consumption can be minimized by inputting "L" to the PMEN

pin in the S-1740/1741 Series A type, or "H" to the PMEN pin in the C type when battery voltage is not monitored.

Battery

S-1740/1741 Series

A / C type

VOUT

VIN

PMEN

VSS

PMOUT

Microcontroller

VDD

AIN

A/D

converter

VSS

CPM

CIN

I/O

Figure 20

VPMOUT

VPMOUT(S)

+ VPOF

Voltage monitoring timing

tPU

VPMEN

Example of active "H"

Figure 21

S1740 Datasheet(PDF) 21 Page - Seiko Instruments Inc

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