RS9116 CC0 Connectivity Module Datasheet v1.0.10, December 2021
silabs.com
| Building a more connected world.
Rev 1.0.10
33
| Page
The chipsets have integrated internal oscillators including crystal oscillators to generate the required clocks.
Integrated crystal oscillators enable the use of low-cost passive crystal components. Additionally, in a system where
an external clock source is already present, the clock can be reused. The following are the recommended options for
the clocks for different functionalities:
Functionality
Default Clock
option
Other Clock option Comments
Wi-Fi or Wi-Fi + BLE
Connectivity
Internal 32 kHz RC
oscillator calibrated
to <200ppm
32 kHz XTAL
oscillator input on
UULPGPIO.
32 kHz XTAL Oscillator clock is optional.
No significant power consumption
impact on connected power numbers
(<10uA).
Wi-Fi + BT or Wi-Fi + BT + BLE
Connectivity with low power
Audio Streaming operation
(A2DP Source)
32 kHz XTAL
oscillator input on
UULPGPIO
Internal 32 kHz RC
oscillator calibrated
to <200ppm
32 kHz XTAL Oscillator clock is
important for Low-power Audio
Streaming operation (A2DP Source).
There is no impact on sleep/deep-sleep power consumption with/without 32 kHz XTAL oscillator clock
32 kHz XTAL sources:
Option 1:
From Host MCU/MPU LVCMOS rail to rail clock input on UULPGPIO
Option 2:
External Xtal oscillator providing LVCMOS rail to rail clock input on UULPGPIO (Nano-drive clock should
not be supplied).
3.4.1.1
32 kHz Clock
The 32 kHz clock selection can be done through software. RC oscillator clock is not suited for high timing accuracy
applications and can increase system current consumption in duty-cycled power modes.
3.4.1.1.1 RC Oscillator
Parameter
Parameter Description
Min
Typ
Max
Units
F
osc
Oscillator Frequency
32.0
kHz
F
osc_Acc
Frequency Variation with Temp and Voltage
1.2
%
Jitter
RMS value of Edge jitter (TIE)
91
ns
Peak Period Jitter
Peak value of Cycle
Jitter with 6σ variation
789
ns
Table 11. 32 kHz RC oscillator
3.4.1.1.2 32 kHz External Oscillator
An external 32 kHz low-frequency clock can be fed through the XTAL_32KHZ_IN functionality.
Figure 6. External 32 kHz Oscillator - Rail to Rail