UM2101 datasheet(13/33 Pages) STMICROELECTRONICS

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UM2101

STLCX01V1 hardware description

DocID029635 Rev 1

13/33

3.1

Power supply

The power is either supplied by the host PC via USB or by an external source through the

Arduino UNO R3 connector (CN6.5).

Jumper J2 selects the power source for the onboard 3.3 V regulator (U4) and the

SensorTile VIN pin:



position 1-2: 5 V external



position 2-3: 5 V via USB (default)

The 3.3 V output of the regulator can be routed to the Arduino UNO R3 connector to power

on other external components by soldering SB18 (default OFF).

The VDDUSB pin of the SensorTile can be connected to two different power sources:



3.3 V

– SB9 (default ON)



1.8 V (SensorTile VDD)

– SB8 (default OFF)

3.2

USB device

The USB connector on the board can be used to supply power and for communication

(USB_OTG_FS).

To use the USB peripheral, use the following solder bridge configuration:



SB10, SB11, SB20 and SB21 OFF (disconnect the signals from U5)



SB9 ON (supply 3.3 V to the USB peripheral of the STM32 MCU)

3.3

Audio DAC

The PCM1774 is a low-power stereo DAC designed for portable digital audio applications,

and can be driven by the SensorTile to play any kind of Audio stream. A dedicated 3.5 mm

audio jack makes it easy to connect headphones or active loudspeakers.

In order to use the onboard audio DAC (U3), the SAI (serial audio interface) and I²C signals

must be routed to the component using the following configuration:



SB12, SB13, SB14, SB15, SB16 and SB17 OFF (disconnect the signals from Arduino

UNO R3 connector)



SB2, SB3, SB4, SB5, SB6, SB7 ON (connect the signals to the DAC)

3.4

Solder bridge details

Table 4: STLCX01V1 solder bridge details

Solder Bridge

SensorTile signal

Onboard signal

Arduino signal

SB1

Reset

CN8.2

SB2(1)

GPIO3

DAC control

– I2C SCL (pull-up)

SB3(1)

GPIO2

DAC control

– I2C SDA (pull-up)

SB4(1)

SAI_SD

DAC Audio

– I2S_SD

SB5(1)

SAI_SCK

DAC Audio

– I2S_SCK

SB6(1)

SAI_FS

DAC Audio

– I2S_WS

SB7(1)

SAI_MCLK

DAC Audio

– I2S_MCLK

SB8

VDDUSB

VDD

– 1.8V from SensorTile

SB9(1)

VDDUSB

3V3 from regulator

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