DocID026902 Rev 3
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UM1817
Hardware layout and configuration
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CAN operates correctly when VDDIO2 > 3V.
2.16 RF-EEPROM
A RF-EEPROM module ANT7-M24LR-A is mounted on connector CN2 and connected to
I2C1 bus of the STM32F091VCT6, this bus shares same I2C1 bus with the temperature
sensor U1 and DDC on HDMI_Source connector CN4.
The I
2
C address of the RF-EEPROM daughterboard is 0b1010000.
2.17 HDMI
CEC
Two HDMI connectors CN3 and CN4 are available on the STM32091C-EVAL board.
•
The connector CN3 is HDMI sink connector with:
–
DDC connected to I2C2 of the STM32F091VCT6
–
HPD controlled by I/O PD11 through transistor T1
–
CEC connected to PB10 through transistor T2
•
The connector CN4 is HDMI source connector with:
–
DDC connected to I2C1 of the STM32F091VCT6 and shared with the temperature
sensor and RF-EEPROM
–
HPD controlled by I/O PD10
–
CEC connected to PB10 through transistor T2
–
HDMI 5 V powered by power switch U3
The signals TDMS D+[0..2], T, TDMS D-[0..2], TDMS_CLK- on these two HDMI
connectors are connected together.
The CEC injector mode is enabled by some PCB reworks for debugging purpose only:
•
Remove resistors R15, R17, R19, R28, R31, R35 and R38.
•
Close solder bridges SB2, SB3, SB4 and SB5.
Note:
The I/O PD11 must be set in open-drain output mode by firmware when working as an HPD
signal control on the HDMI sink connector CN3.
Table 15. CAN related jumpers
Jumper
Description
JP3
CAN transceiver is working in standby mode when JP3 is set as shown to the right:
CAN transceiver is working in high-speed mode when JP3 is set as shown to the
right: (default setting)
CAN transceiver is working in slope-control mode when JP3 is open.
JP2
CAN terminal resistor is enabled when JP2 is fitted.
Default setting: Not fitted
1 2 3
1 2 3
