ST STM3240G-EVAL, User Manual, Page: 15 / 65

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UM1461 Hardware layout and configuration
Doc ID 022138 Rev 1 15/65
Smartcard shares some I/Os with I2S bus for Audio. Some jumper settings need to be
reconfigured to enable smartcard as indicated below:
2.11 MicroSD card
The 1 GByte or more MicroSD card connected to SDIO of STM32F407IGH6 is available on
the board. MicroSD card detection is managed by the standard I/O port PH13. MicroSD
card shares I/Os with motor control, RS-232 and audio. The jumpers JP22 and JP16 must
be refit and motor control connector (CN5) must be disconnected for MicroSD card function.
2.12 MEMS
A ST MEMS device LIS302DL is connected to I2C1 bus of STM32F407IGH6 on the board.
2.13 Potentiometer
There is one 10K ohm potentiometer RV1 connected to PF9 of STM32F407IGH6 on the
board.
2.14 ADC
Two test points (TP3 AIN-) and (TP4 AIN+) are placed close to port PC1 of the MCU
allowing precise measurements on ADC1, ADC2 or ADC3 channel 11. As PC1 is also used
as current A input on the motor control connector it is recommended to remove R219 to
optimize noise immunity on this input.
A potentiometer RV1 is connected to PF9 of STM32F407IGH6. If needed, a low pass filter
(R74 and C59) can be placed on this input to reduce the bandwidth of the analog input PF9.
It is also possible to place the Ethernet PHY (U5) in low power mode in order to reduce the
noise induced by this high frequency peripheral. Power down pin (MII_INT in the schematic)
is connected to PB14 of the MCU, so this I/O can be configured as output low during analog
precision measurement.
Table 9. Smartcard related jumper
Jumper Description
JP21
To connect Smartcard_IO to PC6, JP21must be fitted.
JP21 must not be fitted for Audio DAC connection to I2S.
Default setting: Not Fitted
Table 10. MicroSD card related jumpers
Jumper Description
JP22 Description of JP22 is in Section 2.8: RS-232 and IrDA
JP16
PC9 is connected to MicroSDCard_D1 when JP16 is set as
shown to the right: (Default setting):
PC9 is connected to I2S_CKIN when JP16 is set as show to the
right:
3 2 1
3 2 1
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