SkyeModule Nova Datasheet
-
Preliminary
Page
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31
Skyetek Inc
1732 Wazee St. Ste 202
Denver, CO 80202
www.skyetek.com
Main 720.328.3425 Fax:720.228.2400
10.4
I
2
C
The SkyeModule Nova supports can act as an I
2
C slave device. External pull up resistors are required on the SDA
and SCL lines as shown in
Figure 10-8: I
2
C Connection Diagram. There is also an optional data ready signal to indicate that the current
command is complete and data is available for the host.
Up to +5V
2.2K 2.2K
Figure 10-8: I
2
C Connection Diagram
The protocol for communicating via I
2
C is outlined below:
The I
2
C interface uses a standard two-wire connection in which SCL is the master clock and SDA is a
bidirectional serial data line.
The data packet exchange between the host (I
2
C Master) and the Nova (I
2
C Slave) uses SkyeTek Protocol
v3 (Binary Mode only). See more about the protocol in section 12, Communicating with the Module.
I
2
C fast mode plus (
1MHz
), I
2
C fast mode (
400 kHz
), and
100kHz
data rates are all supported.
The data is sent and received MSB first.
Up to 5V logic levels are allowed. See logic levels in section
Error! Reference source not found.
,
Error!
Reference source not found.
.
The device uses a 7-bit address
The default
address = 0x7F
, but the address can be changed with the Reader ID system parameter. See
more about this system parameter in section 13.3.5, Reader ID.
SkyeModule Nova
SDA (Pin 32)
SCL (Pin 30)
GPIO3 (PIN 45)
I
2
C Master
SDA
SCL
Data Ready (optional)