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HA16103FPJ

Watchdog Timer

Hitachi -> Renesas Electronics 

HA16103 FPJ/FPK

Low Voltage Monitoring Function

The system contains a circuit to send a control signal to the microcomputer when the output voltage drops.

The circuit includes the following features.

• Two-point monitoring of output voltage (VNMI and VSTBY)

• Availability of fine adjustment of Vth1 (VNMI) and Vth2 (VSTBY)

• Output of control signal in standby mode of microcomputer

Figure 5 shows the timing chart of control signals when the output voltage drops.

If the output voltage drops below Vth1 (4.60 V), the NMI signal rises to request the microcomputer to issue

the NMI interrupt signal. The RES signal falls tRES seconds after the NMI signal rises. If the output voltage

drops further to below Vth2 (3.2 V), the STBY signal rises to enable the micro-computer to enter standby

mode.

VBATT

VO

4.70 V

4.60 V

4.70 V 4.60 V

3.20 V

NMI

Power on reset signal

ton

RES

toff

t RH t RL t RES

tr

t RES

Automatic reset signal

STBY

P-RUN

System runaway

Figure 5 Timing Chart for Low Voltage Monitoring

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