Usb Device Supported; St Mems E-Compass (St Mems Lsm303Dlhc Or Lsm303Agr); St Mems Gyroscope (St Mems L3Gd20 Or I3G4250D); Jp3 (Idd) - ST STM32F3DISCOVERY User Manual

UM1570
6.6

USB device supported

The STM32F303VCT6 MCU is also used to drive the second USB Mini-B connector (USB
USER), which allows the board to be used as a USB Device. The STM32F3DISCOVERY
can then act as a USB joystick, mouse, or another similar device. If both USBs are
connected, diodes D4 and D5 protect the board and use the power from the USB ST-LINK.
The board can be powered through this USB USER connector, then LED1 PWR lights,
LED2 COM blinks and it can run an application in standalone mode.
6.7 ST MEMS E-compass (ST MEMS LSM303DLHC or
LSM303AGR)
The LSM303DLHC is an ultra-compact low-power system-in-package featuring a 3D digital
linear acceleration sensor and a 3D digital magnetic sensor. It includes a sensing element
and an IC interface able to provide the measured acceleration to the external world through
2
an I C serial interface.
The LSM303DLHC has dynamically user-selectable full scales of ±2g/±8g and is capable of
measuring acceleration, and a magnetic field full scale from ±1.3g to 8.1g with an output
data rate of 100 Hz or 400 Hz.
The LSM303AGR has linear acceleration full scales of ±2g/±4g/±8g/±16g and a magnetic
field dynamic range of ±50 gauss with an output data rate of 100 kHz, 400 kHz, 1 MHz, and
3.4 MHz.
The STM32F303VCT6 MCU controls this motion sensor through the I
6.8

ST MEMS Gyroscope (ST MEMS L3GD20 or I3G4250D)

The L3GD20 is an ultra-compact, low-power, three-axis-angular-rate sensor. It includes a
sensing element and an IC interface able to provide the measured angular rate to the
external world through the I
The L3GD20 has dynamically user-selectable full scales of ±250 dps/±500 dps/±2000 dps
and is capable of measuring rates.
The I3G4250D has a selectable full scale ±245/±500/±2000 dps and is capable of
measuring rates with a user-selectable bandwidth.
The STM32F303VCT6 MCU controls this motion sensor through the SPI interface.
6.9

JP3 (Idd)

Jumper JP3, labeled Idd, allows the measurement of the consumption of the
STM32F303VCT6 by removing the jumper and connecting an ammeter.
•
Jumper ON: STM32F303VCT6 is powered (default).
•
Jumper OFF: An ammeter must be connected to measure the STM32F303VCT6
current. If there is no ammeter, the STM32F303VCT6 is not powered.
2
C/SPI serial interface.
UM1570 Rev 6
Hardware layout and configuration
2
C interface.
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