S35390A datasheet(22/51 Pages) SII

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FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK

S-35390A H Series

Rev.2.2_00

Seiko Instruments Inc.



INT Pin and

INT

Pin Output Mode

These are selectable for the output mode for

INT and

INT

pins;

Alarm interrupt, the output of user-set frequency, per-minute edge interrupt output, minute-periodical interrupt output 1. In

the

INT

pin output mode, in addition to the above modes, minute-periodical interrupt output 2 and 32.768 kHz output

are also selectable.

To switch the output mode, use the status register 2. Refer to "3. Status register 2" in " Configuration of Registers".

When switching the output mode, be careful of the output status of the pin. Especially, when using alarm interrupt / output

of frequency, switch the output mode after setting "00h" in the INT1 / INT2 register. In 32.768 kHz output / per-minute edge

interrupt output / minute-periodical interrupt output, it is unnecessary to set data in the INT1 / INT2 register for users.

Refer to the followings regarding each operation of output modes.

1. Alarm interrupt output

Alarm interrupt output is the function to output "L" from the

INT /

INT

pin, at the alarm time which is set by user has

come. If setting the pin output to "H", turn off the alarm function by setting "0" in INT1AE / INT2AE in the status register 2.

To set the alarm time, set the data of day of the week, hour and minute in the INT1 / INT2 register. Refer to "4. INT1

" in " Configuration of Registers".

1. 1 Alarm setting of "W (day of the week), H (hour), m (minute)"

OFF

INT1AE / INT2AE

Comparator

INTx register alarm enable flag

• AxHE = AxmE = AxWE = "1"

Status register 2 setting

• INT1 pin output mode

32kE = 0, INT1ME = INT1FE = 0

• INT2 pin output mode

INT2ME = INT2FE = 0

INT1 register

INT2 register

Alarm interrupt

Second Minute

Year

Day of

the week

Day Month

Real-time data

W (day of the week)

01 s

59 s

INT1 pin / INT2 pin

Change by program

Alarm time matches

Period when alarm time matches

Change by program

H h 00 m 00 s

H h (m

− 1) m 59 s

H h (m

+ 1) m 00 s

Change by program

Real-time data

Hour

*1.

If users clear INT1AE / INT2AE once; "L" is not output from the

INT

pin by setting INT1AE / INT2AE enable

again, within a period when the alarm time matches real-time data.

Figure 24 Alarm Interrupt Output Timing

S35390A Datasheet(PDF) 22 Page - Seiko Instruments Inc

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