ISL1221 데이터 시트보기 (PDF) - Intersil

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ISL1221

Real Time Clock/Calendar with Event Detection and Frequency Output

Intersil 

Block Diagram

SDA

SCL

SDA

BUFFER

SCL

BUFFER

ISL1221

I2C

INTERFACE

CONTROL

LOGIC

X1

X2

VDD

VTRIP

VBAT

CRYSTAL

OSCILLATOR

RTC

DIVIDER

POR

FREQUENCY

OUT

SWITCH

INTERNAL

SUPPLY

ALARM

EVIN

GND

Seconds

Minutes

Hours

Day of Week

Date

Month

Year

CONTROL

REGISTERS

USER

SRAM

IRQ/

EVDET

FOUT

Pin Descriptions

PIN

NUMBER

1

SYMBOL

X1

DESCRIPTION

X1. The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external

32.768kHz quartz crystal. X1 can also be driven directly from a 32.768kHz source.

2

X2

X2. The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external

32.768kHz quartz crystal. X2 should be left open when X1 is driven from external source.

3

VBAT

VBAT. This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that

the VDD supply fails. This pin should be tied to ground if not used.

4

GND Ground.

5

EVIN Event Input (EVIN). The EVIN is an input pin that is used to detect an externally monitored event. When a high signal

is present at the EVIN pin an “event” is detected.

6

FOUT Frequency Output FOUT, Frequency output pin, 15 selectable frequencies. Open drain output.

7

SDA

Serial Data (SDA). SDA is a bidirectional pin used to transfer serial data into and out of the device. It has an open

drain output and may be wire OR’ed with other open drain or open collector outputs.

8

SCL

Serial Clock (SCL). The SCL input is used to clock all serial data into and out of the device.Open drain output.

9

IRQ/EVDET Interrupt (IRQ)/Event Detect (EVDET) Output. Multi-functional pin that can be used as interrupt for Alarm and Event

Detect. Open Drain Output.

10

VDD

VDD. Power supply.

2

FN6316.1

July 15, 2010

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