S-35192A Datasheet, PDF (32/41 Pages) Seiko Instruments Inc – 3-WIRE REAL-TIME CLOCK

3-WIRE REAL-TIME CLOCK
S-35192A
Rev.1.2_00
2. Measurement of oscillation frequency
When the S-35192A is turned on, a signal of 32.768 Hz is output from the 32KO pin. Turn the power on and measure the
signal with a frequency counter following the circuit configuration shown in Figure 37.
Remark If the error range is ±1 ppm in relation to 32.768 kHz, the time is shifted by approximately 2.6 seconds per
month (calculated using the following expression).
10^–6 (1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds
10 kΩ 10 kΩ
SIO
SCK
Open
CS
VDD
XIN
S-35192A
XOUT
32KO
VSS
Cg 10 kΩ
Frequency
counter
Figure 37 Configuration of Oscillation Frequency Measurement Circuit
Caution Use a high-accuracy frequency counter of 7 digits or more.
32
Seiko Instruments Inc.