HA16117F 参数 Datasheet PDF下载

HA16117F Series

Block Diagram

5V

GND

V

CC

1

2.52 (117FA)

2.36 (117FB)

2.20 (117FC)

Low voltage detector

−

+

6

1

GND

≈1.25

V

COMP.

RES

0.1

µ

4

C

R

Power-on and auto-reset circuit

(*I

1

< I

2

)

SW2

I

2

adjustment

I

2

I

1

−

+

5

to Micro-

computer

COMP.

SW1

R

1

510 k

8

R

2

750 k

Tadj

(SW1 and SW2 are active high)

Watchdog timer

Watchdog filter (f-duty converter)

W.D out

duty (%)

Normal range

W.D out

f

L

/2

f

H

/2

duty n%

P-RUN

1/2 frequency W.D in

2

divider

duty 50%

n

W.D in frequency (Hz)

3

PULSE from I/O port

Mode

Operating

Standby

ACC Voltage

Low

High

Function

Low voltage detection and WDT

Low voltage detection

C

F

0.01

µ

7

ACC

Operating: "Low"

Standby: "High"

Note: The power-on reset circuit operates in both operating and standby modes.

The HA16117F consists of a low voltage detector, power-on and auto-reset circuit, and watchdog timer.

Low Voltage Detector

Uses a reference voltage source (≈ 1.25 V) and high-precision comparator to detect drops in the supply

voltage.

Power-On and Auto-Reset Circuit

Generates the

RES

waveform, using a multivibrator consisting of a current source I

1

that charges the

external capacitor C

R

, a current source I

2

that discharges C

R

, and a comparator.

3