S-35399A02 Datasheet, PDF (20/55 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A02
Rev.1.0_00
8. FOUT setting register 1 and FOUT setting register 2
FOUT setting register 1 and 2 are 1-byte data registers to set up the output frequency for the FOUT pin. As well as the
function output of user-set frequency, in the INT1 (INT2) register, by setting each bit in the register to “1”, the frequency,
which corresponds to the bit, is output in the AND-form. Figure 24 shows the setting example. At power-on, the FOUT
setting register 1 and 2 are set to “00h” so that no clock pulses are output. The value of output voltage is defined by V_DDL.
B7
B6
B5
B4
B3
B2
B1
B0
256 Hz
R/W
512 Hz
R/W
1 kHz
2 kHz
4 kHz
8 kHz 16 kHz 32 kHz
R/W
R/W
R/W
R/W
R/W
R/W
R/W: Read/Write
Figure 22 FOUT Setting Register 1
B7
1 Hz
R/W
B6
2 Hz
R/W
B5
B4
B3
B2
B1
B0
4 Hz
8 Hz
16 Hz
32 Hz
64 Hz 128 Hz
R/W
R/W
R/W
R/W
R/W
R/W
R/W: Read/Write
Figure 23 FOUT Setting Register 2
Setting example: FOUT setting register 1 : B7 to B0 = 80h,
FOUT setting register 2 : B7 to B0 = 05h
256 Hz
128 Hz
64 Hz
32Hz
FOUT pin
*1
*1
*1
Set data in FOUT setting register 1 and FOUT setting register 2
*1. The value of output voltage is defined by V_DDL. Set V_DDL ≤ V_DD.
Figure 24 Example of output of clock pulse
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Seiko Instruments Inc.