RFHCS362G datasheet(16/60 Pages) MICROCHIP

部品番号	RFHCS362G

部品情報	Code Hopping Encoder with UHF ASK/FSK Transmitter

PDF	60 Pages

Scroll/Zoom	100%

メーカー	MICROCHIP [Microchip Technology]

ホームページ	http://www.microchip.com

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16 / 60 page

rfHCS362G/362F

DS41189A-page 16

Preliminary

3.1.4.4

Cyclic Redundancy Check (CRC)

The CRC bits are calculated on the 65 previously trans-

mitted bits. The decoder can use the CRC bits to check

the data integrity before processing starts. The CRC

can detect all single bit errors and 66% of double bit

errors. The CRC is computed as follows:

EQUATION 3-1:

CRC Calculation

and

with

and Din the nth transmission bit 0 ≤ n ≤ 64

CRC 1

[]

CRC 0

[]

⊕

CRC 0

[]

CRC 0

[]

⊕

() CRC 1

[]

⊕

CRC 1 0

[]

Warning: The CRC may be wrong when the battery

voltage is near the selected VLOW trip point.

This may happen because VLOW is sam-

pled twice each transmission, once for the

CRC calculation and once when VLOW is

transmitted. VDD tends to move slightly dur-

ing a transmission which could lead to a dif-

ferent value for VLOW being used for the

CRC calculation and the transmission.

Work around:

If the CRC is incorrect,

recalculate for the opposite value of VLOW.

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