S-35390A-I8T1G Seiko Instruments, S-35390A-I8T1G Datasheet - Page 39

• Manufacturer Part Number: S-35390A-I8T1G
• Description: IC REAL TIME CLOCK 2WIRE SNT-8A
• Manufacturer: Seiko Instruments
• Type: Clock/Calendarr

Specifications of S-35390A-I8T1G

• 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: SNT-8A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Other names: 728-1059-2; S-35390A-I8T1G

Rev.3.0
2. Measurement of oscillation frequency
When the S-35390A is turned on, the internal power-on detector operates and a signal of 1 Hz is output from the
pin to select the crystal oscillator and optimize the C
counter following the circuit configuration shown in Figure 51 .
If 1 Hz signal is not output, the power-on detector does not operate normally. Turn off the power and then turn it on
again. For how to apply power, refer to “ Power-on Detection Circuit and Register Status” .
Caution
Remark If the error range is ± 1 ppm in relation to 1 Hz, the time is shifted by approximately 2.6 seconds per month
_00
Open
or pull-up
1 kΩ
(calculated using the following expression).
10
1. Use a high-accuracy frequency counter of 7 digits or more.
2. Measure the oscillation frequency under the usage conditions.
3. Since the 1 Hz signal continues to be output, initialization must be executed during normal
–6
(1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds
operation.
1 kΩ
Figure 51 Configuration of Oscillation Frequency Measurement Circuit
SDA
SCL
INT2
S-35390A
Seiko Instruments Inc.
g
value. Turn the power on and measure the signal with a frequency
XOUT
INT1
VDD
VSS
XIN
C
2-WIRE REAL-TIME CLOCK
g
10 kΩ
Frequency
counter
S-35390A
INT
39
1