s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 24

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

24
2-WIRE REAL-TIME CLOCK
S-35392A
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-35392A 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-35392A corrects in the range of −195.3 to
+192.2 ppm (or of −65.1 to +64.1 ppm). (Refer to Table 12.) 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 12 Function to Clock-Correction
−195.3 to +192.2 ppm
Every 20 seconds
3.052 ppm
Seiko Instruments Inc.
B0 = 0
−65.1 to +64.1 ppm
Every 60 seconds
1.017 ppm
B0 = 1
Rev.1.3
_00