CAT1027 CATALYST [Catalyst Semiconductor], CAT1027 Datasheet - Page 3

• Manufacturer Part Number: CAT1027
• Description: Dual Voltage Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM
• Manufacturer: CATALYST [Catalyst Semiconductor]

For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
CAT10XX FAMILY OVERVIEW
PIN DESCRIPTION
RESET/RESET
(RESET CAT1026 Only)
These are open drain pins and RESET can be used as a
manual reset trigger input. By forcing a reset condition on
the pin the device will initiate and maintain a reset condition.
The RESET pin must be connected through a pull-down
resistor, and the RESET pin must be connected through a
pull-up resistor.
SDA:
The bidirectional serial data/address pin is used to transfer
all data into and out of the device. The SDA pin is an open
drain output and can be wire-ORed with other open drain
or open collector outputs.
SCL:
Serial clock input.
PIN FUNCTIONS
C
C
C
C
C
C
C
Pin Name
D
A
A
A
A
A
A
A
RESET
RESET
V
e
T
T
T
T
T
T
V
T
SDA
SCL
WDI
V
SENSE
V
v
1
LOW
1
1
1
1
1
1
CC
c i
SS
0
0
0
0
0
0
0
e
2
2
2
2
2
2
RESET
RESET
RESET
RESET:
SERIAL DATA ADDRESS
SERIAL CLOCK
2
2
4
5
6
7
3
1
n I
M
R
p
Function
Active Low Reset Input/Output
Ground
Serial Data/Address
Clock Input
Power Supply
Auxiliary Voltage Monitor Input
Auxiliary Voltage Monitor Output
Watchdog Timer Interrupt (CAT1027 only)
Active High Reset Output (CAT1026 only)
a
e
t u
n
s
u
RESET OUTPUTS
t e
P
l a
n i
W
a
c t
h
d
o
g
W
M
a
S
S
o
c t
W
W
P
n
D
D
n i
h
I D
I D
t i
A
A
d
r o
o
g
P
o r
3
W
e t
P
i r
n i
t c
e t
OPERATING TEMPERATURE RANGE
V
The V
is compared against CAT1026 and CAT1027 internal
reference voltage of 1.25V typically. Whenever the
input voltage is lower than 1.25V, the open drain
VLOW output will be driven low. An external resistor
divider is used to set the voltage level to be sensed.
Connect V
V
This open drain output goes low when V
than 1.25V and goes high when V
reference voltage.
WDI (CAT1027 Only):
Watchdog Timer Interrupt Input is used to reset the
watchdog timer. If a transition from high to low or low to
high does not occur every 1.6 seconds, the RESET
outputs will be driven active.
o i
LOW
SENSE
Industrial
Extended
n
:
AUXILIARY VOLTAGE MONITOR OUTPUT
SENSE
: AUXILIARY VOLTAGE MONITOR INPUT
V
n I
l o
d
A
SENSE
a t
e
u
input is a second voltage monitor which
g
p
x
e
e
l i
n
a i
S
d
to V
y r
e
e
n
t n
s
-40˚C to 85˚C
-40˚C to 125˚C
CC
e
WATCHDOG TIMER INTERRUPT
if unused.
R
H
E
g i
S
h
E
a
: T
CAT1026, CAT1027
n
d
A
t c
L
SENSE
O
v i
W
e
Doc No. 3010, Rev. K
exceeds the
SENSE
E
E
P
2
2
2
2
2
2
2
is less
R
k
k
k
k
k
k
k
O
M