SR176A5T1GE STMicroelectronics, SR176A5T1GE Datasheet - Page 8

• Manufacturer Part Number: SR176A5T1GE
• Manufacturer: STMicroelectronics

Specifications of SR176A5T1GE

• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

Data transfer
3
3.1
3.2
3.3
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Input data transfer from the Reader to the SR176 (request
Character transmission format for request frame
Request start of frame
Data transfer
frame)
The reader that accesses the SR176 must generate a 13.56 MHz sinusoidal carrier wave on
its antenna, with enough energy to “tele-power” the SR176 device. The energy received on
the SR176 antenna is transformed to a power supply voltage by a regulator, and to data bits
through the ASK demodulator. To decode correctly the information sent to the SR176, the
reader must use a 10% amplitude modulation of the 13.56 MHz wave, as represented
(though not to scale) in
Figure 3.
Data Bytes are transmitted and received by the SR176 as 10-bit characters, as shown in
Figure
addition of the Start Of Frame (SOF) and the End Of Frame (EOF), are grouped to form a
Command Frame as shown in
addresses, data, a CRC and an EOF as defined by ISO 14443-3 Type B. If an error is
detected during the data transfer, no error frame is generated by the SR176, and the
instruction is not executed.
Each bit duration is referred to as an ETU (Elementary Time Unit). One ETU is equal to
9.44 µs (1/106 kHz).
The SOF, as shown in
Modulation Generated
13.5MHz 10% ASK
one falling edge
followed by 10 ETUs at logic 0
followed by one single rising edge
followed by at least 2 ETUs (but no more than 3 ETUs) at logic 1.
Data Bit Transmit
4, with the least significant bit (b
by the Reader
to the SR176
Received wave using ASK modulation
Figure
Figure
5, consists of:
3. The data transfer rate is 106 Kbit/second.
Figure
10. The frame includes an SOF, instructions,
0
) transmitted first. These characters, with the
One bit time is 1/106kHz
AI09058
SR176