UM2032 datasheet(21/48 Pages) STMICROELECTRONICS

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UM2032

Hardware layout and configuration

6.10.1

32F412GDISCOVERY is USB device

When the 32F412GDISCOVERY is USB device, the discovery kit is powered by the 5 V of

the CN3 USB OTG FS Micro-AB connector. In this case a jumper must be put in USB

location of jumper JP3 and the green LEDs LD7 VBUS and LD6 PWR light on to confirm the

5 V presence.

6.10.2

32F412GDISCOVERY is USB host

When the 32F412GDISCOVERY is USB host it supplies the 5V for the USB peripheral

using one of the following sources:

•

ST-LINK/V2-1 USB Micro-B connector CN6, putting a jumper in STLK location of JP3

•

An external +5 V source connected to pins 3 or 4 of the extension connector P2, with

no jumper in JP3.

•

An external +5V source connected to 5 V pin of Arduino Uno V3 connector CN2, with

no jumper in JP3.

•

An external source between +7 to +11 V connected to VIN pin of Arduino Uno V3

connector CN2, putting a jumper in E5V location of JP3.

The green LED LD6 is lighted to confirm the presence of the +5 V source.

The power switch STMPS2141STR is controlled by the port PG8 of STM32 to deliver the

5 V power to the USB device connected to the USB connector CN3. It is recommended to

use PG8 in open drain mode. When PG8 is closed to ground, the power switch is closed,

and the green LED LD7 confirms the 5 V to the USB Device.

The red LED LD8 FAULT is lit when an overcurrent occurs.

For more details refer to Section 6.3: Power supply.

6.11

microSD card

microSD cards with a capacity of 4 Gbytes or more can be inserted in the receptacle CN13.

The four bits of the SDIO interface including CLK and CMD signals of the STM32F412ZGT6

are used to communicate with the microSD card. The card detection is read by the GPIO

PD3: when a microSD card is inserted, the logic level is 0, otherwise it is 1.

Note that port PC9 used as uSD_D1 can be routed also to the pin 46 of the extension

connector P2, by closing the solder bridge SB43 for other usage like the alternate function

MCO2. Therefore the use of the microSD card is exclusive with MCO2 output.

Limitations: The microSD card is not working when the STM32 is supplied with 2V.

6.12

I2C extension connector

The I2C2 bus is available on the I2C extension connector CN10. I2C2-SDA (port PB9) is

available on pin 1 and I2C2-SCL is available on pin 3. Pins 5 and 7 of CN10 are the VDD

and GND supplying the microcontroller. I2C2 voltage levels follows also VDD.

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