S-35390A Seiko Instruments, S-35390A Datasheet - Page 25

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

Rev.1.2
(2) If current oscillation frequency < target frequency (in case the clock is slow)
Register value = Integral value
_00
Caution The figure range which can be corrected is that the calculated value is from 0 to 62
Current oscillation frequency actual measurement value = 0.999920 [Hz],
Target oscillation frequency = 1.000000 [Hz],
Register value = Integral value
= Integral value (26.21) + 1 = 26 + 1 = 27
Thus, set up (B7,B6,B5,B4,B3,B2,B1,B0) = (0,0,0,1,1,0,1,1) for the clock register.
B7 = 0 (minimum resolution = 3.052 ppm),
Current oscillation frequency actual measurement value = 0.999920 [Hz],
Target oscillation frequency = 1.000000 [Hz],
B7 = 1 (minimum resolution = 1.017 ppm),
Register value = Integral value
Thus, this calculated value exceeds the correctable range 0 to 62,
B7 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible.
The example of calculated value 2
The example of calculated value 3
= Integral value (78.66) + 1
(Target oscillation frequency)
(Current oscillation frequency)
(0.999920) × (3.052 × 10
Seiko Instruments Inc.
(1.000000) − (0.999920)
(0.999920) × (1.017 × 10
(1.000000) − (0.999920)
− 6
−
− 6
)
×
)
(Current oscillation frequency
actual measurement value)
+1
(Minimum resolution)
+1
2-WIRE REAL-TIME CLOCK
S-35390A
+ 1
25
.