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HA16129

Single Watchdog Timer

Hitachi -> Renesas Electronics 

HA16129FPJ

Functional Description

This section describes the functions provided by the HA16129FPJ. See the section on formulas for details

on adjustment methods.

Regulator Block

Vout Voltage

This IC provides a stabilized 5V power supply by controlling the base current of an external transistor. The

largest current (the maximum CONT pin current) that can be drawn by the base of this external transistor is

20mA. Also note that the Vout output is also used for the power supply for this IC’s internal circuits.

Current Limiter Block

When a current detection resistor (RCS) is connected between the VCC pin and the CS pin, and the voltage

between these pins exceeds the VCS voltage (150mV Typ), the CONT pin function turns off and the output

voltage supply is stopped. This function can not work when VOUT < 2V.

Output Voltage (Vout) Adjustment

The output voltage can be adjusted by connecting an external resistor at the output voltage adjustment pin

(Voadj). However, if for some reason the voltage on this Vout line increases and exceeds the voltage

adjustment range (7V Max), the CONT pin function turns off and the output voltage supply is stopped.

Refer to the timing charts in conjunction with the following items.

LVI (Low Voltage Inhibit)

NMI Detection Voltage

This function monitors for drops in the power-supply voltage. This function can be set up to monitor either

VCC or Vout. When Vout is monitored, a low level is output from the NMI pin if that voltage falls under the

detection voltage (4.63V Typ). Then, when the power-supply voltage that fell rises again, the NMI pin will

output a high level. Note that this function has a fixed hysteresis of 50mV (Typ). The monitored power

supply is selected by connecting the NMIsns pin either to the VCC pin or to the VOUT pin. When detecting

VCC, an external adjustment resistor is required.)

The detection voltage can also be adjusted with the NMIadj pin.

STBY Detection Voltage

This function monitors for drops in the Vout voltage. It monitors the Vout voltage, and outputs a low level

from the STBY pin if that voltage drops below the detection voltage (3.0V Typ). Then, when the power-

supply voltage that fell rises again, the STBY pin will output a high level. Note that this function has a

fixed hysteresis of 1.35V (Typ).

The detection voltage can also be adjusted with the STBYadj pin.

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