UM2071 datasheet(13/56 Pages) STMICROELECTRONICS

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UM2071

Hardware description

DocID029370 Rev 3

13/56

2.9

LEDs

LEDs DL1 (yellow), DL2 (red), DL3 (blue) and DL4 (green, power LED) are available on the

board (Figure 2: "STEVAL-IDB007V1 board components"

– regions G and P).

2.10

STM32L151CBU6 microcontroller

The most important feature of the STM32L151CBU6 48-pin microcontroller (Figure 2:

"STEVAL-IDB007V1 board components"

– regions Q) is the USB to serial bridge providing

an I/O channel with the BlueNRG-1 device.

The microcontroller is connected to the BlueNRG-1 device through an ST2378E level

translator (region R).

The STM32L microcontroller on the board is not intended to be programmed by

users. ST provides a pre-programmed firmware image for the sole purpose of

interfacing BlueNRG-1 to a USB host device (e.g., a PC).

2.11

Current measurements

To monitor the power consumption of the BlueNRG-1 only, remove the jumper from JP4

and insert an ammeter between pins 1 and 2 of the connector (when the power is ON,

remove the USB connection).

Since power consumption of the BlueNRG-1is usually very low, an accurate instrument in

the range of few micro amps is recommended.

2.12

Hardware setup

Connect an antenna to the SMA connector

Configure the board to USB power supply mode as per the jumper settings in Table 3:

"STEVAL-IDB007V1 kit platform power supply modes"

Connect the board to a PC via USB cable (connector CN5)

Verify the power indication LED DL4 is on.

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