RFM12B_15 Datasheet, PDF (7/41 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

Typical Application
Typical application with FIFO usage
VDD
RFM12B
C1
2.2u
C3 C2
10n
P7
VDI ^(optional)
P6
SDI
1
16 ^{TP C4}
2.2n (opt.)
P5 ^SCK
2
15
P4 ^nSEL
3
14
P3
P2
P1
P0
SDO
nIRQ
(optional)*
nFFS
(optional)*
FFIT
4
13
5 RFM12B 12
6
11
7
10
CLKin ^{CLK (optional) 8}
9
nRESin ^{nRES (optional)}
X1
10MHz
PCB
Antenna
Note: * Connections needed only in time critical applications
Recommended supply decoupling capacitor values
C2 and C3 should be 0603 size ceramic capacitors to achieve the best supply decoupling.
Band [MHz]
433
868
915
C1
2.2µF
2.2µF
2.2µF
C2
10nF
10nF
10nF
C3
220pF
47pF
33pF
Property
SMD size
Dielectric
C1
A
Tantalum
C2
0603
Ceramic
C3
0603
Ceramic
Pin Function vs. Operation Mode
Mode
Transmit
Receive
Bit setting
el = 0
el = 1
ef = 0
ef = 1
Function
Internal TX data register disabled
Internal TX data register enabled
Receiver FIFO disabled
Receiver FIFO disabled
Pin 6
TX data input
nFFS input
(TX data register can be accessed)
RX data output
nFFS input
(RX data FIFO can be accessed)
Pin 7
Not used
RX data clock
output
FFIT output
The el and ef bits can be found in the Configuration Setting Command. Bit el enables the internal TX data register. Bit ef
enables the FIFO mode.
7
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