CAT1021 Просмотр технического описания (PDF) - ON Semiconductor

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CAT1021

Supervisory Circuits with EEPROM Serial 2k-bit I2C Manual Reset and Watchdog Timer

ON Semiconductor 

CAT1021, CAT1022, CAT1023

PIN CONFIGURATION

SOIC Package (W)

TSSOP Package (Y)

MSOP Package (Z)

MR

RESET

WP

VSS

1

8

2

7

CAT1021

3

6

4

5

VCC

RESET

SCL

SDA

MR

RESET

NC

VSS

1

8

2

7

CAT1022

3

6

4

5

VCC

NC

SCL

SDA

MR

RESET

RESET

VSS

1

8

2

7

CAT1023

3

6

4

5

VCC

WDI

SCL

SDA

(Bottom View)

TDFN Package: 3 mm x 3 mm

0.8mm maximum height − (ZD4)

VCC 8

1 MR

RESET 7

2 RESET

CAT1021

SCL 6

3 WP

SDA 5

4 VSS

VCC 8

1 MR

NC 7

2 RESET

CAT1022

SCL 6

3 NC

SDA 5

4 VSS

VCC 8

1 MR

WDI 7

2 RESET

CAT1023

SCL 6

3 RESET

SDA 5

4 VSS

PIN DESCRIPTION

RESET/RESET: RESET OUTPUT

(RESET CAT1021/23 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: SERIAL DATA ADDRESS

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

Serial clock input.

MR: MANUAL RESET INPUT

Manual Reset input is a debounced input that can be

connected to an external source for Manual Reset. Pulling

the MR input low will generate a Reset condition. Reset

outputs are active while MR input is low and for the reset

timeout period after MR returns to high. The input has an

internal pull up resistor.

WP (CAT1021 Only): WRITE PROTECT INPUT

When WP input is tied to VSS or left unconnected write

operations to the entire array are allowed. When tied to VCC,

the entire array is protected. This input has an internal pull

down resistor.

WDI (CAT1023 Only): WATCHDOG TIMER

INTERRUPT

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.

Table 2. PIN FUNCTION

Pin Name

Function

NC

No Connect

RESET

Active Low Reset Input/Output

VSS

SDA

Ground

Serial Data/Address

SCL

Clock Input

RESET

Active High Reset Output (CAT1021/23)

VCC

Power Supply

WP

Write Protect (CAT1021 Only)

MR

Manual Reset Input

WDI

Watchdog Timer Interrupt (CAT1023)

Table 3. OPERATING TEMPERATURE RANGE

Industrial

−40°C to 85°C

Extended

−40°C to 125°C

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