UM0442 datasheet(13/33 Pages) STMICROELECTRONICS

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UM0442

Hardware configuration and functionality

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The USB-OTG standard defines only one-to-one connection. Contrary to the standard USB

there are no USB Hubs defined by the USB-OTG. Connecting the USB hub between two

OTG devices leads to losing all USB-OTG capabilities.

4.10

JTAG connector

To allow enabling of debug features as well as programming capabilities, the STR750-MAP

is equipped with a standard JTAG connector.

Figure 11 below shows how the pins and the corresponding signals are placed in the JTAG

connector.

Figure 11.

The JTAG connector

4.11

On-board sensors

As described in the features list of the board, the STR750-MAP is provided with one 3-axis

digital MEMS accelerometer (the LIS3LV02DQ) and one analog temperature sensor (the

STLM20).

Both sensors are mounted with their package size (QFN28 and UDFN4 package

respectively).

While the temperature sensor provides only the analog output (connected to the ADC

channel 0, pin number 2 in the microcontroller pin-out), the accelerometer could output both

I2C and SPI digital serial output. As a design choice, the STR750-MAP allows the on-board

accelerometer to communicate with the STR750FV2 using only the I2C serial bus (the CS

pin is fixed at 3.3 V).

The board offers the possibility to disconnect this I2C bus from the accelerometer, allowing

the microcontroller to communicate with external peripherals using this bus at 3.3 V as Vcc

with both standard and fast protocol variants.

To manage these settings, refer to Section 4.16: I2C and BSPI connectors on page 18 .

The packages are described in Figure 12, where on the left side is the QFN28 package of

the accelerometer, and on the right side is the UDFN4 package of the temperature sensor.

Refer to the device datasheet in the Reference section for further details.

UM0442 bảng dữ liệu(PDF) 13 Page - STMicroelectronics