HA16129AFPJ datasheet(8/23 Pages) RENESAS

8 / 23 page

HA16129AFPJ

Rev.1.00 Jun 15, 2005 page 8 of 22

Calculation Formulas (cont.)

Item

Formula

Notes

VSTBY

VSTBY = 1.48 ×

67.6

29.5 + 36.2 // R1

+ 1

(

The voltage at which the

STBY signal is output when Vout

falls. The

STBY detection voltage can be adjusted by

connecting a resistor between the STBYadj pin and ground

(R3). However, the

STBY recovery voltage cannot be

adjusted.

STBY

VSTBY

VSTBY'

Vout

STBYadj

Vout

STBY

VNMI

(Vout detection)

VNMI = 1.2 × 1 +

R1, R2; k

Ω

R1 // 73

R2 // 25

(

The voltage at which the

NMI signal is output when Vout

falls. (When NMIsns is connected to Vout.)

The

NMI detection voltage can be adjusted by connecting

resistors between the NMIadj pin and Vout (R1), and

between the NMIadj pin and ground (R2).

NMI

VNMI

VNMI'

Vout

NMI

NMIsns

NMIadj

GND

VNMI

(VCC detection)

VNMI = 4.62 ×

Recovery voltage

R2 // 97.1

(

+ 1

VNMI = 4.68 ×

R1, R2; k

Ω

R2 // 45.5

(

+ 1

The voltage at which the

NMI signal is output when VCC

falls. (When NMIsns is connected to VCC.)

The

NMI detection voltage can be adjusted by connecting

resistors between the NMIsns pin and VCC (R1), and

between the NMIsns pin and ground (R2).

NMI

VNMI

VNMI'

VCC

Vout

NMI

NMIsns

GND

VCC CS

OUTE

CR × RR > 19.3 × Cf × Rf

If the OUTE function is used, the relationship shown at the

left must be fulfilled to assure that pulses are not incorrectly

generated in this output when a microprocessor runaway

state is detected.

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