ICM7170AIPG datasheet(7/14 Pages) ROCHESTER

Part #	ICM7170AIPG

Description	Microprocessor-Compatible, Real-Time Clock 8-Bit, uP Bus Compatible

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Manufacturer	ROCHESTER [Rochester Electronics]

Direct Link	http://www.rocelec.com/

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7 / 14 page

ICM7170

Specification Number ICM7170_IM (IL) REV -

Page 7 of 14

6

Pin Descriptions

SIGNAL

PIN NUMBER

SOIC PIN NUMBER

DESCRIPTION

WR

1

19

Write Input

ALE

2

20

Address Latch Enable Input

CS

3

21

Chip Select Input

A4-A0

4 - 8

22 - 2

Address Inputs

OSC OUT

9

3

Oscillator Output

OSC IN

10

4

Oscillator Input

INT SOURCE

11

5

Interrupt Source

INTERRUPT

12

6

Interrupt Output

VSS (GND)

13

7

Digital Common

VBACKUP

14

8

Battery Negative Side

D0 - D7

15 - 22

9 - 16

Data I/O

VDD

23

17

Positive Digital Supply

RD

24

18

Read Input

TABLE 1. COMMAND REGISTER FORMAT

COMMAND REGISTER ADDRESS (10001b, 11h) WRITE-ONLY

D7

D6

D5

D4

D3

D2

D1

D0

n/a

Normal/Test

Mode

Interrupt

Enable

Run/Stop

12/24 Hour

Format

Crystal

Frequency

Crystal

Frequency

TABLE 2. COMMAND REGISTER BIT ASSIGNMENTS

D5

TEST BIT

D4

INTERRUPT

ENABLE

D3

RUN/STOP

D2

24/12 HOUR

FORMAT

D1

D0

CRYSTAL

FREQUENCY

0

Normal Mode

0

Interrupt disabled

0

Stop

0

12-Hour Mode

0

32.768kHz

1

Test Mode

1

Interrupt enable

1

Run

1

24-Hour Mode

0

1

1.048576MHZ

1

0

2.097152MHz

1

4.194304MHz

TABLE 3. ADDRESS CODES AND FUNCTIONS

ADDRESS

FUNCTION

DATA

VALUE

A4

A3

A2

A1

A0

HEX

D7

D6

D5

D4

D3

D2

D1

D0

0

00

Counter-1/100 seconds

-

0 - 99

0

1

01

Counter-hours

-

0 - 23

12 Hour Mode

†

-

1 - 12

0

1

0

02

Counter-minutes

-

0 - 59

0

1

03

Counter-seconds

-

0 - 59

0

1

0

04

Counter-month

-

1 - 12

0

1

0

1

05

Counter-date

-

1 - 31

0

1

0

06

Counter-year

-

0 - 99

0

1

07

Counter-day of week

-

0 - 6

0

1

0

08

RAM-1/100 seconds

M

0 - 99

0

1

0

1

09

RAM-hours

-

M

-

0 - 23

12 Hour Mode

†

M

-

1 - 12

0

1

0

1

0

0A

RAM-minutes

M

-

.

0 - 59

0

1

0

1

0B

RAM-seconds

M

-

.

0 - 59

0

1

0

0C

RAM-month

M

-

1 - 12

0

1

0

1

0D

RAM-date

M

-

1 - 31

0

1

0

0E

RAM-year

M

0 - 99

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