CYUSB3KIT-001 EZ-USB FX3 Development Kit Guide, Doc. #: 001-70237 Rev. *C
77
Hardware
4.6
Serial Interfaces
EZ-USB FX3 supports the following serial interfaces:
■
I2C
■
I2S
■
SPI and UART
■
JTAG
4.6.1
I2C Interface
The I2C interface lines on the FX3 device are available on headers for probing and expansion, as
well as to connect to an on-board EEPROM device. You can set the EEPROM address bits A2, A1,
and A0 using the on-board dip switch SW40.
As shown in
Figure 4-13
, setting the SW40 dip switch to the ON position connects the output to
ground and connects a logic LOW to the EEPROM address lines. The OFF position connects VIO5
to the address lines of the EEPROM. Jumper J134 of the FX3 DVK sets the VIO5 voltage level.
Figure 4-13. EEPROM and Address Selection Switches
See the “I2C EEPROM Boot” section of the application note
AN76405 - EZ-USB FX3 Boot Options
for more details.
4.6.2
I2S
FX3 has an I2S port to support external audio codec devices. FX3 functions as an I2S master
(transmitter only). The I2S interface consists of four signals: clock line (I2S_CLK), serial data line
(I2S_SD), word select line (I2S_WS), and master system clock (I2S_MCLK). FX3 can generate the
system clock as an output on the I2S_MCLK line or accept an external system clock input on the
same line. All four I2S lines come out on header J20.
4.6.3
SPI and UART
EZ-USB FX3 supports an SPI master interface on the serial peripheral port. The SPI I/O lines are
shared with the UART I/O lines on the FX3 device. The FX3 DVK jumper settings do not allow both
the SPI and UART interfaces to operate simultaneously.
I2C EEPROM
I2C_SCL_EEPROM
I2C_SDA_EEPROM
I2C_SCL_EEPROM
I2C_SDA_EEPROM
VIO5
VIO5
VIO5
VIO5
I2C_SDA_EEPROM
{8}
I2C_SCL_EEPROM
{8}
J147
HDR_1X4
J147
HDR_1X4
1
2
3
4
SW40
DIP_SWITCH_4POS
PART_NUMBER = 218-4LPST
Manufacturer = CTS Electrocomponents
SW40
DIP_SWITCH_4POS
PART_NUMBER = 218-4LPST
Manufacturer = CTS Electrocomponents
1
2
3
6
7
8
4
5
24LC256
U44
110-44-308-41-001000
24LC256
U44
110-44-308-41-001000
A0
1
A1
2
A2
3
GN
D
4
WP
7
SCL
6
SDA
5
VCC
8
R111
0
R0402
R111
0
R0402
R110
10K
R110
10K
R262
10K
R262
10K
C212
0.1uF
C212
0.1uF
C197
0.01uF
C197
0.01uF
R263
10K
R263
10K
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