S35390A datasheet(24/51 Pages) SII

24 / 51 page

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

S-35390A H Series

Rev.2.2_00

Seiko Instruments Inc.

3. Per-minute edge interrupt output

Per-minute edge interrupt output is the function to output "L" from the

INT

pin, when the first minute-carry

processing is done, after selecting the output mode.

To set the pin output to "H", turn off the output mode of per-minute edge interrupt. In the

INT

pin output mode, input

"0" in INT1ME in the status register 2. In the

INT

pin output mode, input "0" in INT2ME.

OFF

INT1ME / INT2ME

INT1 pin / INT2 pin

"L" is output again if this period is within 7.81 ms*1.

Change by program

Minute-carry processing

Minute-carry

processing

Status register 2 setting

• INT1 pin output mode

32kE = 0, INT1AE = Don’t care (0 or 1), INT1FE = 0

• INT2 pin output mode

INT2AE = Don’t care (0 or 1), INT2FE = 0

*1.

Pin output is set to "H" by disabling the output mode within 7.81 ms, because the signal of this procedure is

maintained for 7.81 ms. Note that pin output is set to "L" by setting the output mode enable again.

Figure 27 Timing of Per-Minute Edge Interrupt Output

4. Minute-periodical interrupt output 1

The minute-periodical interrupt 1 is the function to output the one-minute clock pulse (Duty 50%) from the

INT

pin, when the first minute-carry processing is done, after selecting the output mode.

INT1ME, INT1FE

INT2ME, INT2FE

30 s

INT1 pin / INT2 pin

Minute-carry

processing

Minute-carry

processing

Minute-carry

processing

Minute-carry

processing

Minute-carry

processing

"L" is output again if this period is within 7.81 ms*1.

Change by program (OFF)

"H" is output again if this period is 7.81 ms or longer.

"L" is output at the next minute-carry processing.

Status register 2 setting

INT1 pin output mode

32kE = 0, INT1AE = 0

INT2 pin output mode

INT2AE = 0

*1.

Setting the output mode disable makes the pin output "H", while the output from the

INT

pin is in "L".

Note that pin output is set to "L" by setting the output mode enable again.

Figure 28 Timing of Per-Minute Steady Interrupt Output 1

S35390A Datasheet(PDF) 24 Page - Seiko Instruments Inc

S35390A Datasheet(HTML) 24 Page - Seiko Instruments Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Datasheet Download

Link URL