SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 43

• Manufacturer Part Number: SM1211E915TOPIC
• Description: KIT PICTAIL EXT FOR SX1211
• Manufacturer: Semtech
• Type: Transceiver, UHFr

Specifications of SM1211E915TOPIC

• Frequency: 915MHz
• For Use With/related Products: SX1211
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note that some connections may not be needed depending on the application:
In addition, NSS_DATA pin (unused in continuous mode) should be pulled-up to VDD through a 100 k resistor.
Please refer to Table 13 for SX1211’s pins configuration
Table 19: Relevant Configuration Registers in Continuous Mode (data processing related only)
Tx Mode:
Rx Mode:
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
SYNCParam
IRQParam
MCParam
RXParam
IRQ_0: if Sync and RSSI interrupts are not used. In this case, leave floating.
IRQ_1: if the chip is never used in Tx FSK mode (DCLK connection is not compulsory in Rx and Tx OOK
modes). In this case, leave floating.
MISO: if no read register access is needed. In this case, pull-up to VDD through a 100 k resistor.
Configure all data processing related registers listed below appropriately. In this example we assume that both
Bit synchronizer and Sync word recognition are on.
Go to Tx mode (and wait for Tx to be ready, see Figure 50)
Send all packet’s bits on DATA pin synchronously with DCLK signal provided on IRQ_1
Go to Sleep mode
Program Rx interrupts: IRQ_0 mapped to Sync (Rx_stby_irq_0=”00”) and IRQ_1 mapped to DCLK (Bit
synchronizer enabled)
Go to Rx mode (note that Rx is not ready immediately, see Figure 49)
Wait for Sync interrupt
Get all packet bits on DATA pin synchronously with DCLK signal provided on IRQ_1
Go to Sleep mode
5.3.5. uC Connections
5.3.6. Continuous Mode Example
nd
, 2008
Rx_stby_irq_0
Data_mode_x
Sync_value
Sync_size
Sync_on
Sync_tol
Figure 37: uC Connections in Continuous Mode
SX1211
Tx
X
IRQ_1 (DCLK)
NSS_CONFIG
IRQ_0
DATA
MOSI
MISO
SCK
Rx
X
X
X
X
X
X
Page 43 of 92
Description
Defines data operation mode (
Defines IRQ_0 source in Rx mode
Enables Sync word recognition
Defines Sync word size
Defines the error tolerance on Sync word recognition
Defines Sync word value
uC
Continuous)
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SX1211