s-35192a Seiko Instruments Inc., s-35192a Datasheet - Page 22

• Manufacturer Part Number: s-35192a
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

22
3-WIRE REAL-TIME CLOCK
S-35192A
INT1 flag/INT2 flag
Function to Clock-Correction
INT1AE/INT2AE
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”.
Alarm setting of “H (hour)”
Real-time data
Status register 2 setting
• Alarm 1 function
• Alarm 2 function
INT1ME = INT1FE = 0
None
Correction
Minimum resolution
Correction range
(H − 1) h 59 m 59 s
Change by program
Figure 24 Output Timing of INT1 Flag and INT2 Flag (2/2)
H h 00 m 00 s 01 s
Second
Table 11 Clock Correction Function
−195.3 to +192.2 ppm
Change by program
Every 20 seconds
INT register 1
INT register 2
Minute
3.052 ppm
mx Hx Wx Dx Mx Yx
INT register x alarm enable flag
• AxWE = AxmE = “0”, AxHE = “1”
Read status register 1
Seiko Instruments Inc.
Real-time data
B0 = 0
Hour Day of
Comparator
the week
Period when alarm time matches
Change by program
Day Month Year
59 s H h 01 m 00 s
−65.1 to +64.1 ppm
Every 60 seconds
Alarm output to INT1 flag/INT2 flag
(B3 or B2 in status register 1)
Change by program
1.017 ppm
B0 = 1
Read status register 1
H h 59 m 59 s (H + 1) h 00 m 00 s
Rev.1.2
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