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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7. SX1230 Application Circuits
7.1. SX1230 E 2 PROM Mode Application Circuit
Figure 10 shows the standard E 2 PROM connection for stand alone mode operation of the SX1230. With a preconfigured
E 2 PROM (see Section 6.1 for a full description of operation) upon connection of the battery to this circuit the SX1230 reads
the configuration section of the E 2 PROM then sends itself into sleep mode. Both devices remain in sleep mode until a key-
press is detected.
Once a key is pressed the SX1230 wakes up and starts the RC oscillator. After a user defined wait period, to allow
debouncing and determined by debounce_time(2:0), the frame corresponding to the button press is read and transmitted.
Once the transmission is complete, both the SX1230 and the E 2 PROM return to their sleep mode configuration. For the
corresponding receiver application circuit please see Figure 12.
100 nF
3V
100k
100 nF
C TX
PB(3:0)
VBAT
E2_MODE
NSS
CS
Hold
VCC
SX1230
MISO
MOSI
SO
SI
SPI
EEPROM
Match
RFOUT
SCK
SCK
L M
VR_ANA
VR_DIG
WP
VSS
10 nF
VR_PA
XTA
XTB
GND
100 nF
100 nF
15 pF
32 MHz
15 pF
Figure 10. The SX1230 Stand-Alone Mode Application Circuit
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 27
www.semtech.com
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