RFHCS362GT-I/SO Microchip Technology, RFHCS362GT-I/SO Datasheet - Page 16

• Manufacturer Part Number: RFHCS362GT-I/SO
• Description: IC CODE HOPPNG ENCDR W/RF 18SOIC
• Manufacturer: Microchip Technology

Specifications of RFHCS362GT-I/SO

• Frequency: 310MHz ~ 440MHz
• Applications: Automotive, Building Access, Garage Openers
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 3.3 kbps
• Power - Output: -12dBm ~ 2dBm
• Current - Transmitting: 11.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -

rfHCS362G/362F
3.1.4.4
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:
and
with
and Di
DS41189A-page 16
CRC 0
n
the nth transmission bit 0
CRC 1
n
Cyclic Redundancy Check (CRC)
+
1
=
n
CRC 1 0
+
CRC 0
1
CRC Calculation
=
CRC 0
n
0
=
Di
0
n
n
n
Di
64
CRC 1
n
n
Preliminary
Warning: The CRC may be wrong when the battery
voltage is near the selected V
This may happen because V
pled twice each transmission, once for the
CRC calculation and once when V
transmitted. V
ing a transmission which could lead to a dif-
ferent value for V
CRC calculation and the transmission.
Work around:
recalculate for the opposite value of V
DD
2002 Microchip Technology Inc.
tends to move slightly dur-
If the CRC is incorrect,
LOW
being used for the
LOW
LOW
trip point.
is sam-
LOW
LOW
is
.