Connectors
UM2271
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DocID030906 Rev 2
11.11
EXT_I2C connector CN7
The EXT_I2C connector socket is used to connect external modules to I2C1 interface or to
monitor the I2C1 interface.
Figure 18. EXT_I2C connector CN7
As I2C1 is available for external use, it is important to note that those following I2C1
applications and addresses are already used on board:
Depending on the I2C module plugged into CN7, I2C1 could even be used up to
Fast mode + (1 MHz).
Table 24. SWD header CN5
Pin number
Description
Pin number
Description
1
VDD
4
SWDIO (PA13)
2
SWCLK (PA14)
5
NRST
3
GND
6
SWO (PB3)
Table 25. EXT_I2C connector CN7
Pin number
Description
Pin number
Description
1
I2C1_SDA (PG13)
5
+3V3
2
NC
6
NC
3
I2C1_SCL (PB6)
7
GND
4
EXT_RESET (MFX_GPIO11)
8
NC
Table 26. I2C1 addresses (on board)
Application
W/R I2C
address
I2C max. speed
Comment
DSI display Touch Panel 0x71/0x70
400 kHz
Default I2C address
Audio Codec
0x95/0x94
100 kHz
Default I2C address
CAMERA
0x61/0x60
400 kHz
For STM32F4DIS-CAM Module
MFX_V3
0x85/0x84
400 kHz
Default I2C address
06Y9
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