s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 27

• Manufacturer Part Number: s-35399a03
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.0
Function to Clock-Correction
6. Operation of power-on detection circuit (only in the
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-35399A03 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-35399A03 corrects in the range of
− 195.3 to +192.2 ppm (or of − 65.1 to +64.1 ppm). (Refer to Table 14 .) 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”.
When power is applied to the S-35399A03, the power-on detection operates to set “1” in the POC flag (B0 in the status
register 1). A 1 Hz clock pulse is output from the
• 32kE = 0, INT1AE = INT1ME = 0
Status register 2 setting
INT1FE
INT1 pin
_00
Adjustment
Minimum resolution
Correction range
Figure 30 Output Timing of
Table 14 Function to Clock-Correction
− 195.3 to +192.2 ppm
Every 20 seconds
INT
3.052 ppm
Seiko Instruments Inc.
B0 = 0
1
INT
Pin during Operation of Power-on Detection Circuit
1
0.5 s
pin.
0.5 s
INT
1
pin output mode)
− 65.1 to +64.1 ppm
Every 60 seconds
2-WIRE REAL-TIME CLOCK
Change by reset command
1.017 ppm
B0 = 1
OFF
S-35399A03
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