s-35192a Seiko Instruments Inc., s-35192a Datasheet - Page 32

• Manufacturer Part Number: s-35192a
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

32
3-WIRE REAL-TIME CLOCK
S-35192A
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 .
Caution
Remark If the error range is ± 1 ppm in relation to 32.768 kHz, the time is shifted by approximately 2.6 seconds per
10 kΩ
month (calculated using the following expression).
10
Open
Use a high-accuracy frequency counter of 7 digits or more.
–6
(1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds
10 kΩ
Figure 37 Configuration of Oscillation Frequency Measurement Circuit
SIO
SCK
CS
S-35192A
Seiko Instruments Inc.
XOUT
32KO
VDD
VSS
XIN
C
g
10 kΩ
Frequency
counter
Rev.1.2
_00