S-35390A-T8T1G Seiko Instruments, S-35390A-T8T1G Datasheet - Page 26

IC RTC I2C 2-WIRE 8-TSSOP

S-35390A-T8T1G

Manufacturer Part Number
S-35390A-T8T1G
Description
IC RTC I2C 2-WIRE 8-TSSOP
Manufacturer
Seiko Instruments
Type
Clock/Calendarr
Datasheet

Specifications of S-35390A-T8T1G

Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
1.3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TSSOP
Function
Clock/Calendar/Alarm/Battery Backup/Interrupt
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1.3 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Rtc Bus Interface
Serial (2-Wire, I2C)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
728-1007-2

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26
2-WIRE REAL-TIME CLOCK
S-35390A
1. How to calculate
(1) If current oscillation frequency > target frequency (in case the clock is fast)
(2) If current oscillation frequency < target frequency (in case the clock is slow)
*1. Convert this value to be set in the clock correction register. For how to convert, refer to “(a) Calculation
*2. Measurement value when 1 Hz clock pulse is output from the
*3. Target value of average frequency when the clock correction function is used.
*4. Refer to Table 13 .
(a) Calculation example 1
(a) Calculation example 2
(b) Calculation example 3
example 1”.
In case of current oscillation frequency actual measurement value = 1.000070 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = 128 − Integral value
Convert the correction value “106” to 7-bit binary and obtain “1101010b”.
Reverse the correction value “1101010b” and set it to B7 to B1 of the clock correction register.
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (0, 1, 0, 1, 0, 1, 1, 0)
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz]. B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = Integral value
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (1, 1, 0, 1, 1, 0, 0, 0)
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 1 (Minimum resolution = 1.017 ppm)
Correction value = Integral value
This calculated value exceeds the correctable range 0 to 62.
B0 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible.
Caution The figure range which can be corrected is that the calculated value is from 0 to 64.
Correction value
Correction value = Integral value
Caution The figure range which can be corrected is that the calculated value is from 0 to 62.
= 128 − Integral value (22.93) = 128 − 22 = 106
= Integral value (26.21) + 1 = 26 + 1 = 27
= Integral value (78.66) + 1
*1
= 128 − Integral value
(
(
0.999920
0.999920 ×
Seiko Instruments Inc.
(Target oscillation frequency) −
(
(Current oscillation frequency
(
1.000000 −
1.000000
actual measurement value)
(
1.000070 ×
(
(Current oscillation frequency
actual measurement value
(Current oscillation frequency
1.000070 −
actual measurement value
)
)
)
)
(
3.052 10-6
(
(
1.017 × 10
0.999920
(
)
0.999920
)
(
3.052 × 10
(
1.000000
)
INT
)
-6
)
)
1
+ 1
+ 1
pin (or
− 6
)
×
(Current oscillation frequency
)
actual measurement value)
*2
*2
)
)
(Minimum resolution)
INT
×
(Target oscillation frequency
2
(Minimum resolution
pin).
Rev.3.0
*4
+ 1
)
*3
_00
)

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