EV-GM-00-1.0 SkyeTek, EV-GM-00-1.0 Datasheet - Page 32

• Manufacturer Part Number: EV-GM-00-1.0
• Description: RF Development Tools Gemini Eval Kit ISO14443, ISO18094
• Manufacturer: SkyeTek
• Type: RF Readersr

Specifications of EV-GM-00-1.0

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: ISO14443, ISO18092
• Frequency: 13.56 MHz
• Operating Supply Voltage: 5 V
• Description/function: Evaluation kit for SkyeModule Gemini NFC OEM reader module
• Interface Type: I2C, Serial, SPI, USB
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• For Use With: ISO14443, ISO18092

Main 720.328.3425 Fax:[phone]
SkyeModule Gemini Datasheet
The protocol for retrieving the response data is outlined below:
Figure 11-7 below shows the timing required to retrieve data on the MISO line.
NOTE
behavior. Always make sure to read the entire response when using the SPI interface.
MISO
SSEL
CLK
GPIO3_DR







– Not reading the entire response before sending another command can cause undesired
The SkyeModule Gemini is half duplex so the response data must be retrieved after the request
has been sent.
The GPIO3_DR (data ready) signal will transition high when data is available for the host.
If data ready is not implemented on the host, the host can poll the module starting 1ms after the
command send is complete. The module will respond with 0x00 when no data is present, and
0x02 (start of frame) when data is available.
Response data will be thrown away if not read within 10 seconds of becoming available.
The MISO signal provides the response data from SkyeModule Gemini to the host.
To retrieve data on the MISO line, the SSEL (Slave Select) signal must be low when the clock is
sent for an entire byte. Between bytes, SSEL can either stay low or transition high again as
long as it transitions low before the first clock of the next byte.
The host can use the data length field (response bytes 2 and 3) in order to determine how
many bytes to read from the module as these first bytes will always be present immediately
following a start of frame (0x02).
Figure 11-7: SPI Response Timing
Response
1525 Market St. Ste 200
Denver, CO 80202
www.skyetek.com
Skyetek Inc
Page
| 32