12028IVZ データシートの表示（PDF） - Renesas Electronics

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12028IVZ

Real Time Clock/Calendar with I2C Bus™ and EEPROM

Renesas Electronics 

ISL12028, ISL12028A

Pin Descriptions

PIN

NUMBER

SYMBOL

1

X1

2

X2

6

RESET

7

GND

8

SDA

9

SCL

12

IRQ/FOUT

13

VBAT

14

VDD

3, 4, 5, 10,

NC

11

DESCRIPTION

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.

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.

RESET is a reset signal output. This signal notifies a host processor that the “Watchdog” time period has expired or

that the voltage has dropped below a fixed VTRIP threshold. It is an open drain active LOW output. Recommended

value for the pull-up resistor is 5k. If unused, connect to ground.

Ground.

Serial Data (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.

The Serial Clock (SCL) input is used to clock all serial data into and out of the device. The input buffer on this pin is

always active (not gated).

Interrupt Output/Frequency Output is a multi-functional pin that can be used as interrupt or frequency output pin. The

function is set via the configuration register. It is a CMOS push-pull output and does not require a pull-up resistor.

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.

Power Supply.

No Internal Connection.

FN8233 Rev 10.00

August 14, 2015

Page 3 of 29

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