S-35192A Datasheet, PDF (22/41 Pages) Seiko Instruments Inc – 3-WIRE REAL-TIME CLOCK

3-WIRE REAL-TIME CLOCK
S-35192A
Rev.1.2_00
Alarm setting of “H (hour)”
Status register 2 setting
• Alarm 1 function
INT1ME = INT1FE = 0
• Alarm 2 function
None
INT register x alarm enable flag
• AxWE = AxmE = “0”, AxHE = “1”
INT register 1
INT register 2
mx Hx Wx Dx Mx Yx
Comparator
Second Minute
Hour
Day of
the week
Day
Month
Year
Real-time data
Alarm output to INT1 flag/INT2 flag
(B3 or B2 in status register 1)
Real-time data (H − 1) h 59 m 59 s H h 00 m 00 s 01 s
59 s H h 01 m 00 s
H h 59 m 59 s _{(H + 1) h 00 m 00 s}
Change by program Change by program Change by program Change by program
INT1AE/INT2AE
INT1 flag/INT2 flag
Read status register 1
Read status register 1
Period when alarm time matches
Figure 24 Output Timing of INT1 Flag and INT2 Flag (2/2)
„ Function to Clock-Correction
The function to clock-correction is to correct advance/delay of the clock due to the deviation of oscillation frequency, in
order to make a high precise clock. For correction, the S-35192A adjusts the clock pulse by using a certain part of the
dividing circuit, not adjusting the frequency of the crystal oscillator. Correction is performed once every 20 seconds (or 60
seconds). The minimum resolution is approx. 3 ppm (or approx. 1 ppm) and the S-35192A corrects in the range of −195.3 to
+192.2 ppm (or of −65.1 to +64.1 ppm). (Refer to Table 11.) Users can set up this function by using the clock-correction
register. Regarding how to calculate the setting data, refer to “1. How to calculate”. When not using this function, be sure
to set “00h”.
Correction
Minimum resolution
Correction range
Table 11 Clock Correction Function
B0 = 0
Every 20 seconds
3.052 ppm
−195.3 to +192.2 ppm
B0 = 1
Every 60 seconds
1.017 ppm
−65.1 to +64.1 ppm
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Seiko Instruments Inc.