s-35199a01 Seiko Instruments Inc., s-35199a01 Datasheet - Page 45

• Manufacturer Part Number: s-35199a01
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.0
2. Measurement of oscillation frequency
When the S-35199A01 is turned on, the internal power-on detector operates and a signal of 1 Hz is output from the INT
pin to select the crystal oscillator and optimize the C
counter following the circuit configuration shown in Figure 56 .
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 Detector 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
10 kΩ
Open
Open
Open
Open
(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 condition.
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.
10 kΩ
Figure 56 Configuration of Oscillation Frequency Measurement Circuit
SIO
SCK
CTRL
F32K
FOUT
CS
S-35199A01
Seiko Instruments Inc.
g
VDDL
value. Turn the power on and measure the signal with a frequency
XOUT
VDD
VSS
XIN
INT
C
3-WIRE REAL-TIME CLOCK
g
10 kΩ
Frequency
counter
S-35199A01
45