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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
VM
O
N
0
VM
O
N
1
VM
O
N
2
VM
O
N
3
VM
O
N
4
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
GN
D
*W
D
I_
E
N
R
ESET
1
#
R
ESET
0
#
VD
D
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
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