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| 型号： | SM1230E868 |
| 厂商： | Semtech |
| 文件页数： | 29/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL XMITTER FOR SX1230 |
| 设计资源： | SM1230 BOM SX1230 Eval Board Schematic |
| 标准包装： | 1 |
| 类型： | 发射器 |
| 频率： | 868MHz |
| 适用于相关产品： | SX1230 |
| 已供物品： | 板 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
Receiver Voltage Supply
Vcc
SX1213 RKE Receiver
DATASHEET
OSC2
OSC1
IO_1
IO_2
NC
CLK OUT
DCLK
DATA
LFM
LFP
VR_PA
IO
MCU
SI
SO
SCK
CS
MISO
MOSI
SCK
NSS
SX1213
RF_IN
VDD
VR_DIG
Vss
VR_1V
VR VM VP
XTA
XTB
TS ( μ s ) = 5 + 1.25 ? pa_ramp_rising_time(3:0) + --------------
TS _TS ( μ s ) = 5 + --------------
Figure 12. SX1213 RKE Demonstration Receiver
7.4. Wake-up Times
When switching between modes, an optimized sequence of events is automatically performed by SX1230. For example, in
response to the command to enter transmit mode whilst in sleep mode, each intermediate mode is engaged - ensuring
crystal oscillator start-up and PLL lock before transition to transmit mode. External indication of PLL lock is given by the
PLL lock pin (MCU mode only). The PLL lock pin output is only valid whist no data is applied to the DATA pin. The transition
from frequency synthesizer mode to transmit is well defined and a function of bit rate and transmit ramp time, given in FSK
mode by:
1
2 ? R B
where pa_ramp_rising_time(3:0) is the user defined contents of PaFskRamp and R B is the bit rate. For OOK mode the time
is given by:
1
2 ? R B
A flow chart showing the automatic, optimised start-up procedure, initiated with a single SPI command is shown in
Figure 14. Note that after the PLL lock indicator is set then the transmitter requires TS_TR to set-up before transmission
may begin.
7.5. Reset Pin Timing
Manual reset of the SX1230 is possible by asserting a logical high to the reset pin. The timing for this operation is shown in
the following figure. During the reset operation the SX1230 current consumption may rise to 1 mA. Following the reset
operation the user must wait 5 ms before performing any other operation.
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 29
www.semtech.com
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