XE1202A Просмотр технического описания (PDF) - Semtech Corporation

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XE1202A

433 MHz / 868 MHz / 915 MHz Low-Power, Integrated UHF Transceiver

Semtech Corporation 

XE1202A TrueRF™

5.2.2 FSParam configuration register

Name

FSParam_Band

FSParam_Dev

FSParam_BR

FSParam_Freq

Bits

Byte Address

7-6

00010

5-3

00010

2-0

00010

7-0

7-0

00011

00100

Description

Frequency band:

0 0 -> not valid

0 1 -> 433 – 435 MHz

1 0 -> 868 – 870 MHz

1 1 -> 902 – 928 MHz

Frequency deviation:

0 0 0 -> 5 kHz

0 0 1 -> 10 kHz

0 1 0 -> 20 kHz

0 1 1 -> 40 kHz

1 0 0 -> 100 kHz

Bit rate:

0 0 0 -> 4.8 kbits/s

0 0 1 -> 9.6 kbits/s

0 1 0 -> 19.2 kbits/s

0 1 1 -> 38.4 kbits/s

1 0 0 -> 76.8 kbits/s

others -> not valid

LO frequency in 2’s-complement

representation:

00…0 -> fLO = middle of the range

0X…X -> fLO = higher than the

middle of the range

1X…X -> fLO = lower than the

middle of the range

MSB = bit 7 of byte at pos. 00011

LSB = bit 0 of byte at pos. 00100

See example below

Table 12: FSParam configuration register

Table 13 below provide an example of LO frequency setting in FSParam_Freq:

Byte

00011

Bit 7

Address

Bit 0

Byte Address

00100

Bit 7

Bit 0

00000000

00000000

00000000

11111111

11111111

00000000

00000001

00000010

11111111

11111110

LO frequency

Note: FXTAL = 39.0 MHz

F0, where F0 depends on the selected

frequency band (see FSParam_Band )

F0 = 434.0 MHz for the 433-435 MHz band

F0 = 869.0 MHz for the 868-870 MHz band

F0 = 915.0 MHz for the 902-928 MHz band

F0 + 500 Hz

F0 + 2 * 500 Hz

F0 – 500 Hz

F0 – 2 * 500 Hz

Table 13: LO Frequency setting

© Semtech 2006

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