IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit

1568—05/30/08

Advance Information

ICS9WDV3501B

Voltage Monitor/Watchdog Timer Circuit

3

Advance Information

TSSOP Pin Configuration

TSSOP Pin Description

PIN #

(TSSOP)

PIN NAME

PIN TYPE

DESCRIPTION

1VMON1

PWR

Voltage Monitor Input, nominal 1.0V threshold

2

VMON0

IN

Voltage Monitor Input, nominal 1.0V threshold

3

VDDA

PWR

3.3V Analog Power Supply

4

WTB1

IN

Watchdog timout select bit. (MSB)

5

WTB0

IN

Watchdog timout select bit. (LSB)

6

WDI

IN

Watchdog Input

7

RP

IN

Resistor connection for internal oscillator

8

GND

GND

Ground pin

9

*WDI_EN

IN

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

10

RESET1#

OUT

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

11

RESET0#

OUT

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

12

VDD

PWR

3.3V Power Supply

13

RST0_SEL0

IN

RESET1 timeout period select (LSB)

14

RST0_SEL1

IN

RESET1 timeout period select (MSB)

15

RST1_SEL0

IN

RESET1 timeout period select (LSB)

16

RST1_SEL1

IN

RESET1 timeout period select (MSB)

17

GNDA

GND

Analog Ground

18

VMON4

IN

Voltage Monitor Input, nominal 1.0V threshold

19

VMON3

IN

Voltage Monitor Input, nominal 1.0V threshold

20

VMON2

IN

Voltage Monitor Input, nominal 1.0V threshold

VMON1 1

20 VMON2

VMON0 2

19 VMON3

VDDA 3

18 VMON4

WTB1 4

17 GNDA

WTB0 5

16 RST1_SEL1

WDI 6

15 RST1_SEL0

RP 7

14 RST0_SEL1

GND 8

13 RST0_SEL0

*WDI_EN 9

12 VDD

RESET1# 10

11 RESET0#

20-pin TSSOP

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