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SI4021 Datasheet(PDF) 4 Page - Silicon Laboratories

Part # SI4021
Description  Automatic antenna tuning circuit
PDF  35 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4021 Datasheet(HTML) 4 Page - Silicon Laboratories

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Si4021
4
Typical Application, Microcontroller Mode
VDD
XTL
VSS
MOD
RFN
RFP
nIRQ
VDD
FSK
X1
10MHz
GND
GND
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
IA4221
GND
C3
10p
C2
100p
C1
1u
GP4
GP3
GP2
GP1
MICRO
CONTROLLER
GP0
CLKin
(EC osc. mode)
SDI
SCK
nSEL
PB1
PB2
PB3
PB4
CLK
GP5
OPTIONAL
OPTIONAL
GND
GP6
GP7
GP8
GP9
To other
circuits
Antenna



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