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| 型号： | SM1230E868 |
| 厂商： | Semtech |
| 文件页数： | 10/46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
DATASHEET
4. Working Modes of the SX1230
4.1. Operating Modes
The four operating modes of the SX1230 are shown in Table 6. Each of these may be selected via the SPI bus by writing
the corresponding bits to Mode(2:0). A key feature of the SX1230 is that the transition from one operating mode to the next
is automatically optimized. For example, if the transmit operating mode is selected whilst in sleep operating mode then, in
a pre-defined time-optimized sequence, each of the intermediate modes is engaged sequentially without the need to issue
any further SPI commands. For more information on timing and optimization please see Section 7.4.
Table 6
SX1230 Operating Modes
Enabled Blocks
MODE(2:0)
Selected Mode
000
Sleep mode
RC Osc
Optional
SPI
x
Xtal Osc
Freq. Synth.
PA
001
Stand-by mode
Optional
x
x
010
FS mode
Optional
x
x
x
011
Transmit mode
Optional
x
x
x
x
4.2. Application Modes
The SX1230 has two application modes, selected by applying an external logical level to the E2_MODE input (pin 6). The
first, MCU mode (E2_Mode= ‘0’), configures the SX1230 as an SPI slave. This permits the configuration of the circuit by an
external microprocessor via the SPI interface of the SX1230 and the data to be applied via the DATA input (pin 14). The
second application mode, stand-alone mode (E2_Mode = 0), sees the SX1230 configured as SPI master. In the stand-
alone application mode the SX1230 can download its configuration from an external SPI E 2 PROM. Moreover, in response
to an input on the GPIO pins, a specific configuration can be programmed and a payload transmitted.
Note that this mode selection process is performed at start up (or POR) of the circuit. Thus the hardware mode cannot be
dynamically changed without resetting the chip. This may be achieved either by power down or by issuing an active high
POR signal to the Reset input (pin 5). For reset signal timing please see the diagram of Figure 13 and accompanying
description.
4.2.1. Stand Alone Mode
In stand alone mode (E2_Mode = ‘1’) the SX1230 will operate as a stand-alone SPI master which can download both
register settings and data payload from an SPI E 2 PROM. Four debounced GPIO inputs are available in stand alone mode,
in this application mode the SX1230 remains in sleep operating mode until either a single or combination of button presses
are detected. SX1230 can then be dynamically reconfigured and / or transmit a data sequence stored within the E 2 PROM.
The SX1230 can accommodate SPI E 2 PROM sizes up to 8 kbit and uses industry standard SPI commands. For a full
description of E 2 PROM use with SX1230 and the associated application circuits, please see Section 6.1. The application
circuit for stand-alone operation is shown in Figure 3, note that both matching and L M are band specific whilst C TX is
application specific.
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 10
www.semtech.com
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