XE8807AMI026TLF Semtech, XE8807AMI026TLF Datasheet - Page 105

• Manufacturer Part Number: XE8807AMI026TLF
• Description: IC MCU LOW PWR MTP FLASH 32-TQFP
• Manufacturer: Semtech

Specifications of XE8807AMI026TLF

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (11 kB)
• Controller Series: XE8000
• Ram Size: 512 x 8
• Interface: UART, USRT
• Number Of I /o: 24
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XE8807AMI026TR

14.12.2.5 Transmission mode using NRZ coding
This RF link uses a wide band transmission in the 915MHz frequency band. The protocol of the messages to be
sent is NRZ Level. The start sequence of the message is a 4 byte pattern (10101010 10101010 10101010
11010100). The messages have a data rate of 76.8 kbit/s with a frequency deviation of 100 kHz. The output power
is 0 dBm. The following paragraphs will show how to set-up the XE1202A, how to set-up the RF interface and how
to handle the received data.
14.12.2.5.1
To set the XE1202A in transmission mode, set the pins MODE(2:0) = 111.
To select the 915MHz band, the bits FSParam_band = 11. The frequency deviation is set to 100kHz by writing
RTParam_Dev = 11. The baud rate is set to 76.8 kbit/s by writing FSParam_BR = 100. The output power is set to 0
dBm by writing RTParam_Tpow = 00. The setup of the XE1202a is shown in Table 14-31.
14.12.2.5.2
We then set-up the RF interface of the microcontroller circuit as a transmitter (RfifEnRx = 0 and RfifEnTx = 1).
Assume that the RC clock frequency used in the microcontroller is 1.2 MHz. To select the correct baud rate of 76.8
kbit/s according to the equation in chapter 14.10, fine*coarse=1.2e06/(16*76.8e3)=0.98. We can approximate this
at 1 (see specification in Table 14-19). This can be done by setting RfifBRCoarse = 00 and RfifBRFine = 0000.
The external bit synchronization clock is switched off by clearing the bit RfifTxClock = 0.
The encoder is enabled and set to NRZ Level encoding by setting RfifEnCod = 1 and RfifPCM = 000.
The set-up of the interface is summarized in the Table 14-32.
© Semtech 2006
Register
RTParam1
RTParam2
FSParam1
FSParam2
FSParam3
DataOut
ADParam1
ADParam2
Pattern1
Pattern2
Pattern3
Pattern4
Table 14-31. XE1202A register set-up (see XE1202A datasheet for bit explanation)
XE1202A set-up
RF interface set-up
Register Address
RegRfifCmd1
RegRfifCmd2
RegRfifCmd3
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
Register
Table 14-32. RF interface set-up
14-25
0
0
1
0
0
0
0
0
0
0
0
0
7
0
1
1
0
0
0
0
0
0
0
0
0
6
0
0
1
0
0
0
0
0
0
0
0
0
5
00000000
00100010
00000001
contents
0
0
0
0
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
3
0
0
1
0
0
0
0
0
0
0
0
0
2
XE8806A/XE8807A
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
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