unicore UM982 - Hardware Design; Recommended Minimal Design; RF Inductor Recommendations; Decoupling and DC Blocking Capacitors

UC-00-M31 EN R1.2 Hardware Design 13
3 Hardware Design
3.1 Recommended Minimal Design
UM982
ANT_BIAS2
ANT1
HOSTUM982
3.3V
VCCV_BCKP
ANT2
ANT_BIAS1
ANT1_IN
ANT2_IN
TXD
RXD
RESET_N
GND GND
L1
L1
C1
C1
C2
C2
C3
BIF BIF
R1 R1
3.3V 3.3V
RXD(UART)
TXD(UART)
IO
Figure 3-1 Recommended Minimal Design
L1: 68 nH RF inductor in 0603 package is recommended
C1: 100 nF + 100 pF capacitors connected in parallel is recommended
C2: 100 pF capacitor is recommended
C3: N * 10 μF + 1 * 100 nF capacitors connected in parallel is recommended, and the
total inductance should be no less than 30 μF
R1: 10 kΩ resistor is recommended