MC33591FTA Freescale Semiconductor, MC33591FTA Datasheet - Page 6

• Manufacturer Part Number: MC33591FTA
• Description: IC RF RECEIVER 315,434MHZ 24LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC33591FTA

• Frequency: 315MHz, 434MHz
• Sensitivity: -105dBm
• Data Rate - Maximum: 11 kBaud
• Modulation Or Protocol: FSK, OOK
• Applications: General Data Transfer
• Current - Receiving: 5.7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 1.9 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -

COMMUNICATION PROTOCOL
rate. This bit sequence and its complement must not be found in the sequence preamble and ID word.
Data must follow the Header without any delay.
Even in case of FSK modulation, the data must be completed by a EOM and not by simply stopping the RF
telegram. If the complement of the Header word is received, output data are complemented too.
and an EOM. The preamble is placed at the beginning of both ID and Header words.
MESSAGE PROTOCOL
Consequently, the transmitted ID burst has to be long enough to include two consecutive receiver Run cycles.
If the Strobe oscillator is enabled (SOE=1), the circuit is in Sleep mode during SR
during T
If SOE=0, these timings constraints must be respected by the external control applied on pin STROBE.
6
The Header word is a 4 bit Manchester coded message ‘0110’ or its complement sent at the selected data
Data are completed by a End-of-Message (EOM) word, consisting of 2 NRZ consecutive ones or zeroes.
The following example shows a complete message with Preamble, ID, Header words followed by 2 data bits,
If the receiver is continuously Sleep/Run cycling, the ID word has to be recognized to stay in Run mode.
Therefore, the sleep/run cycle period is equal to (SR+1)
Figures 8 & 9 detail RF signals and the processing done by the receiver in several configuations.
T
T
Strobe
Run
Run
Strobe
Strobe
(where T
P+ID
Preamble
Strobe
SR
P+ID
1 1 0 0 1 0 0 0
SR
is the Strobe oscillator period and SR is the Strobe Ratio, see Table 5).
Figure 7: Complete telegram with tone detection
´
Figure 6: Complete telegram with ID detection
Sleep
Sleep
´
T
Freescale Semiconductor, Inc.
Strobe
T
Strobe
Figure 5: Complete message example
For More Information On This Product,
P+ID
ID
MC33591 Technical Data
Tone
Go to: www.freescale.com
P+ID
ID detected
ID detected
P+ID
Preamble
´
T
Strobe
P+ID
.
0 1
P+Header
Header
1
P+ID = Preamble ID
P+Header
0
Header
Data
Run
Run
1 0
= Preamble Header
´
T
EOM
Strobe
Data
Data
MOTOROLA
and in Run mode
EOM
EOM
RF signal
RF signal
Sleep
Sleep