- 您现在的位置：买卖IC网 > Sheet目录527 > SX1240SKA433 (Semtech)TVS
SX1240
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
When powering up the circuit (microcontroller and SX1240), the logic level of the CTRL pin is sampled after T_START, as
described on Figure 3. During T_START, the microcontroller IO driving the CTRL pin must be configured as an output,
driving the CTRL pin to the desired state.
Note
whilst the logic level of CTRL pin during T_START (initialization phase of the microcontroller) does not have any
effect on the device operation, the pin should not be connected to VDD through an impedance lower than 20 k
ohms or higher than 1 M ohms.
Figure 7. Power-up Timing
3.2.2. Transmitter Operation in Advanced Mode
When operating in advanced mode two possibilities exist for operation of the transmitter, these are dependent upon the
state of the Tx Mode bit (D12 of the register description in Table 8).
Tx Mode = ‘0’
When set to logical ‘0’ operation is identical to that of the Power & Go mode, following completion of the programming
phase, the SX1240 will be placed in transmit mode upon the next rising edge detected on the DATA pin. Transmit operation
will then be in accordance with that of Figure 4 with the time TOFFT corresponding to that programmed.
Note that prior to programming the default, logical ‘0’, configuration is loaded. Note also that subsequent programming
iterations can only be performed once the transmit cycle is finished - including the time required for switching off the PA
(TOFFT).
Tx Mode = ‘1’
With Tx Mode (D12) set to ‘1’ during the register programming cycle detailed in Figure 5, the SX1240 is placed directly in
transmit mode. It will then remain in transmit mode until a second TWI register write operation where, if reset to logical ‘0’,
the SX1240 returns to sleep mode. An illustration of this operation is shown in the following timing diagram.
Please also note that once in sleep mode, subsequent activity on the DATA pin (without clocking of the CTRL line) will
trigger transmission in accordance with Figure 4. Care must hence be taken to avoid inadvertent transmission due to such
activity.
SX1240, Rev 1, Oct 2010
?2010 Semtech Corp.
Page 11
www.semtech.com
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
SX1701BI085TRT
IC AMP 2.5GHZ 5.3V 16-MLPQ
TA002-10002
LED HEATSINK W/FAN 12V 40X10MM
TC620HEPA
IC TEMP SNSR 5V DUAL TRIP 8-DIP
TC623CVOA713
IC TEMP SNSR 3V DUAL TRIP 8-SOIC
TC624VOA
IC TEMP SNSR PROG 2.7V 8SOIC
TC6501P125VCTTRG
IC TEMP SWTCH OPEN DRAIN SOT23A5
TCS3104FN
IC COLOR SENSOR LIGHT-VOLT 4-DFN
TCS3416CS
IC COLOR SENSOR DGTL 6CHIPSCAL
相关代理商/技术参数
SX1241ISETRT
制造商:Semtech Corporation 功能描述:RF TRANSMITTER 300MHZ BAND 制造商:Semtech Corporation 功能描述:SX1241 Series 369-396 MHz RF Transmitter - SOIC-8 制造商:SEMTECH 功能描述:SX1241 Series 369-396 MHz RF Transmitter - SOIC-8
SX1242
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:SX1242 - Low Cost Integrated Transmitter IC
SX1242ISETRT
制造商:Semtech Corporation 功能描述:RF Transmitter OOK 2.5V/3.3V 8-Pin SOIC EP T/R 制造商:Semtech Corporation 功能描述:GPSS WL SKU APP1 制造商:Semtech Corporation 功能描述:GPSS WL SKU APP1; Modulation Type:OOK; Data Rate:10Kbps; Transmitting Current:22mA; RF IC Case Style:SOIC; No. of Pins:8; Supply Voltage Min:1.8V; Supply Voltage Max:3.7V; Output Power (dBm):12dBm; Operating Temperature Min:-40C ;RoHS Compliant: Yes 制造商:Semtech Corporation 功能描述:GPSS WL SKU APP1; Frequency Max:344.94MHz; Modulation Type:OOK; Data Rate:10Kbps; Transmitting Current:22mA; RF IC Case Style:SOIC; No. of Pins:8; Supply Voltage Min:1.8V; Supply Voltage Max:3.7V; Output Power (dBm):12dBm ;RoHS Compliant: Yes
SX1243
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Cost Low Current Integrated Transmitter 310 to 928MHz Frequency Agile
SX1243IULTRT
制造商:Semtech Corporation 功能描述:RF Transmitter FSK/OOK 2.5V/3.3V 8-Pin DFN-UT EP T/R 制造商:Semtech Corporation 功能描述:SX1243 Series 3.7 V 928 MHz Low Cost Low Current Integrated Transmitter-DFN-UT-8
SX1243SKA915
制造商:Semtech Corporation 功能描述:Development Kit for SX1243 Transmitter IC 915MHZ
SX1257
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Power Digital I and Q RF Multi-PHY Mode Transceiver
SX1257-57SKA868
制造商:Semtech Corporation 功能描述: