SX1230-12SKA433 Semtech, SX1230-12SKA433 Datasheet - Page 28

• Manufacturer Part Number: SX1230-12SKA433
• Description: USB Kit - SX1230 433Mhz
• Manufacturer: Semtech

7.2. SX1230 MCU Mode Application Circuit
Figure 11 shows conventional MCU mode configuration of the SX1230 - here the interface to the SX1230 is performed
using 5 MCU pins. In this mode the MCU acts as SPI master exercising total control of the SX1230. For further economy
the MCU clock may be driven using the clock output of the SX1230 which can provide several fractions of the crystal
oscillator frequency from the fundamental to 1/32 depending upon the setting of clkout_select(2:0).
7.3. Complete RKE Application Circuit
Compatible Semtech receivers for RKE applications are the SX1213 (315 and 434 MHz bands) and the SX1210 (868 and
915 MHz ISM bands), the application circuit for which is shown in the proceeding figure. With both transmitter and receiver
configured for wide-band operation, (frequency deviation of 150 kHz), and both devices employing crystals with 50ppm
frequency stability, the worst case frequency error between Tx and Rx is 31.5 kHz.
SX1230, Revision 2 May 2009
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
Match
10 nF
L
M
VR_PA
15 pF
RFOUT
PB(3:1)
XTA
32 MHz
Figure 11. Interfacing the SX1230 to an MCU
XTB
SX1230
PB0
EOL
15 pF
VBAT
GND
CLKOUT
VR_ANA
VR_DIG
MODE
MOSI
DATA
DCLK
MISO
SCK
NSS
100 nF
Page 28
100 nF
100 nF
IO
IO
SCK
SI
SO
CS
OSC1
VCC
VSS
MCU
Integrated Transmitter IC
100 nF
C
TX
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3 V