BCM88335 Data Sheet
External 32.768 kHz Low-Power Oscillator
External 32.768 kHz Low-Power Oscillator
The BCM88335 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.
Table 3: External 32.768 kHz Sleep Clock Specifications
Parameter
LPO Clock
Units
Nominal input frequency
Frequency accuracy
Duty cycle
32.768
kHz
ppm
%
±200
30–70
Input signal amplitude
Signal type
200–1800
mV, p-p
–
Square-wave or sine-wave
a
>100k
<5
Ω
Input impedance
pF
Clock jitter (during initial start-up)
<10,000
ppm
a. When power is applied or switched off.
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 30
BROADCOM CONFIDENTIAL
CYPRESS [ CYPRESS ]
