External 32.768 Khz Low-Power Oscillator - Infineon Cypress CYW43353 Manual

3.4 External 32.768 kHz Low-Power Oscillator

The CYW43353 uses a secondary low-frequency clock for low-power-mode timing. An external 32.768 kHz precision oscillator is
required. Use a precision external 32.768 kHz clock that meets the requirements listed in
Table 3. External 32.768 kHz Sleep Clock Specifications
Nominal input frequency
Frequency accuracy
Duty cycle
Input signal amplitude
Signal type
1
Input impedance
Clock jitter (during initial start-up)
1. When power is applied or switched off.
Document Number: 002-14949 Rev. *G
PRELIMINARY
Parameter
Table
LPO Clock
32.768
±200
30–70
200–1800
Square-wave or sine-wave
>100k
<5
<10,000
CYW43353
3.
Units
kHz
ppm
%
mV, p-p
–
Ω
pF
ppm
Page 17 of 113