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9.3
I
2
C
The M1-Mini supports standard I
2
C for connecting to a host controller. The M1-Mini operates as an I
2
C slave
device. Standard 2-wire connection is used with SCL and SDA. SCL is the bi-directional system clock line. SDA is
the bi-directional serial data line. The M1-Mini must have proper firmware to enable I
2
C operation. I
2
C fast mode is
supported to provide a 400 kHz data rate or the slower 100 kHz data rate. The data is sent and received MSB
first. Data exchange between the host and the M1-Mini is defined according to the SkyeTek Protocol, Binary
mode.
NOTE
– Loop and Inventory modes are not supported for the I
2
C Host Interface.
Figure 8: I2C Connection: M1-Mini to Host
•
Both 100kHz and fast mode 400kHz clock rates are supported
•
External pull up resistors are required but should be strong (less than or equal to 2.2kΩ) for fast mode to
function properly
•
I2C address should be 0x3F; 7-bit address mode should be used
•
Write should be used for the request
•
Read should be used for the response
•
A delay must be included between the request and response for tag commands to function properly
•
Be sure to read at least enough bytes to receive the entire response, including CRC, for each response
sequence or future responses from the module may give unexpected results