IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit

1568—05/30/08

Advance Information

ICS9WDV3501B

Voltage Monitor/Watchdog Timer Circuit

2

Advance Information

MLF Pin Configuration

MLF Pin Description

20

19

18

17 16

VDDA 1

15 GNDA

WTB1 2

14 RST1_SEL1

WTB0 3

13 RST1_SEL0

WDI 4

12 RST0_SEL1

RP 5

11 RST0_SEL0

67

8

9 10

9WDV3501

20-pin MLF

pins preceded by '*' have 100kohm internal pull up.

PIN #

(MLF)

PIN NAME

PIN TYPE

DESCRIPTION

1

VDDA

PWR

3.3V Analog Power Supply

2

WTB1

IN

Watchdog timout select bit. (MSB)

3

WTB0

IN

Watchdog timout select bit. (LSB)

4

WDI

IN

Watchdog Input

5

RP

IN

Resistor connection for internal oscillator

6

GND

GND

Ground pin

7

*WDI_EN

IN

This input enables or disables the watchdog timer. 0 = Disable, 1 = Enable

8

RESET1#

OUT

RESET 1 output. Low = Reset, High = Normal Operation

9

RESET0#

OUT

RESET 0 output. Low = Reset, High = Normal Operation

10

VDD

PWR

3.3V Power Supply

11

RST0_SEL0

IN

RESET1 timeout period select (LSB)

12

RST0_SEL1

IN

RESET1 timeout period select (MSB)

13

RST1_SEL0

IN

RESET1 timeout period select (LSB)

14

RST1_SEL1

IN

RESET1 timeout period select (MSB)

15

GNDA

GND

Analog Ground

16

VMON4

IN

Voltage Monitor Input, nominal 1.0V threshold

17

VMON3

IN

Voltage Monitor Input, nominal 1.0V threshold

18

VMON2

IN

Voltage Monitor Input, nominal 1.0V threshold

19

VMON1

IN

Voltage Monitor Input, nominal 1.0V threshold

20

VMON0

IN

Voltage Monitor Input, nominal 1.0V threshold