unicore UM981 - Hardware Design; Recommended Minimal Design

UM981 User Manual
14 Hardware Design UC-00-M33 EN R1.0
3 Hardware Design
3.1 Recommended Minimal Design
UM982
ANT
HOSTUM981
3.3V
VCCV_BCKP
ANT_BIAS
ANT_IN
TXD
RXD
RESET_N
GND GND
L1
C1
C2
C3
BIFBIF
3.3V
R1 R1
TXD (UART)
RXD (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