ST EVALSPEAr320HMI, User Manual, Page: 9 / 36

EVALSPEAr320HMI Block descriptions and configurations
Doc ID 18410 Rev 3 9/36
4 Block descriptions and configurations
●
MicroSD card power up
● Ethernet on page 10
●
TFT LCD with touch on page 10
– Connecting an LCD on page 11
– Connecting a touch screen on page 12
● CAN on page 13
●
RS232 transceivers (U500 and U501) on page 14
● Power supply on page 15
●
Dual interface EEPROM (U702) on page 15
● NAND flash memory (U100) on page 15
●
Audio output on page 16
● LEDs (LD700 through LD703) on page 16
●
Reset button (B700) on page 16
Note: See also: Chapter 5: Connector pinouts on page 17
4.1 MicroSD card power up
The MicroSD card connector is on the EVALSPEAR320HMI SDIO interface.
To power-up the MicroSD card properly:
1. Detect card insertion.
Card detection is managed by the standard SDIO signal SDCD .
2. Enable the single channel power switch U801 by means of PL_GPIO42 (active low).
By default, U801 power output is disabled by the R808 pull-up resistor connected to the
power switch enable pin.
JP800 controls the MicroSD card access that manipulates the MicroSD interface Write
Protect signal. By default JP800 is closed, and the card is used in Write-Enabled mode.
See also: MicroSD card connector (CN800) on page 24
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