ACE5372

Low Power Real-Time Clock (RTC)

VER 1.3

9

Alarm-A day-of-week register (at internal address AH)

D7

D6

D5

D4

D3

D2

D1

D0

Operation

-

AW6

AW5

AW4

AW3

AW2

AW1

AW0

Write

0

AW6

AW5

AW4

AW3

AW2

AW1

AW0

Read

0

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Default

Alarm-B day-of-the-week register (at internal address DH)

D7

D6

D5

D4

D3

D2

D1

D0

Operation

-

BW6

BW5

BW4

BW3

BW2

BW1

BW0

Write

0

BW6

BW5

BW4

BW3

BW2

BW1

BW0

Read

0

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Default

*Default means read value when XSTP bit is set to “1” by starting up from 0V, or supply voltage drop, etc.

* ALARM-A, ALARM-B hour register D5 is set to

“0” for AM and “1” for PM in the 12-hour display system.

The register D5 indicates 10 digit of hour digit in 24-hour display system.

* To activate alarm operation, any imaginary alarm time setting should not be left to avoid un-matching.

* In hour digit display midnight is et to

“12”, noon is set to “32” in 12-hour display system.

* AW0 to AW6 (BW0 to BW6) correspond to the day-of-the-week counter being set at (0,0,0) to (1,1,0).

No alarm pulses are output when all of AW0 to AW6 (BW0 to BW6) are set to

“0”

Example of Alarm Time Settings

Alarm Time

Settings

Day-of-the-week

12-hour system

24-hour system

Sun

Mon

Tue

Wed

Thu

Fri

Sat

10H

1H

10M

1M

10H

1H

10M

1M

00:00AM

every day

1

1

1

1

1

1

1

1

2

0

0

0

0

0

0

05:27AM

every day

1

1

1

1

1

1

1

0

5

2

7

0

5

2

7

11:59AM

every day

1

1

1

1

1

1

1

1

1

5

9

1

1

5

9

00:00PM on

Mon thru Fri

0

1

1

1

1

1

0

3

2

0

0

1

2

0

0

05:56PM on

Wed

0

0

0

1

0

0

0

2

5

5

6

1

7

5

6

11:59PM on

Tue, Thu, and

Sat

0

0

1

0

1

0

1

3

1

5

9

2

3

5

9