Silicon Laboratories Si4700 User Manual page 6

AN232
Configuration Value of Configuration
Variable
Reference clock Crystal oscillator on EVB
source
Reference clock External clock
source
VIO source Output of U2
VIO source VMCU/VIO supply (U2
bypassed)
VA/VD source Output of U3
VA/VD source VRADIO supply (U3
bypassed)
6
Table 1. EVB Configuration Matrix
Hardware Changes
Variable
None (default option).
Depopulate R19. Populate
R20 with 0 Ω.
None (default option).
Depopulate U2. Populate
R30 with 0 Ω resistor.
None (default option).
Depopulate R14. Populate
R25 with 0 Ω resistor.
Rev. 0.2
Constraints
None
32.768 kHz, CMOS switch-
ing level, VIO voltage supply
from an external clock
source
5 V input at VMCU/VIO sup-
ply on J4.
3.0–3.6 V input at VMCU/
VIO supply on J4
5 V input at VRADIO supply
on J4
2.7–5.5 V input at VRADIO
supply on J4