Push-Buttons; Jtag Connector; Leds; Stm32L151Cbu6 Microcontroller - Jorjin WS2119E20 User Manual

3.6. Push-buttons

The board has one user button to reset the microcontroller (Figure 2: " WS2119E20
board components" – region H) and one further button for application purposes
(region I).

3.7. JTAG connector

A JTAG connector (Figure 2: " WS2119E20 board components" – region G) allows
BlueNRG-1 microcontroller programming and debugging with an in-circuit
debugger and programmer such as ST-LINK/V2.
Only SWD mode is supported.

3.8. LEDs

LEDs CR1 (green, power LED) and CR2 (red) are available on the board (Figure 2:
"WS2119E20 board components" – regions J and K).

3.9. STM32L151CBU6 microcontroller

The most important feature of the STM32L151CBU6 48-pin microcontroller (Figure 2:
"WS2119E20 board components" – regions M) 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 O).
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). The JTAG connector (Figure 2:
"WS2119E20 board components" – regions N) is only for Jorjin internal used.

3.10. Hardware setup

1. Connect one 2.4GHz antenna to BLE U.FL connector (Figure 2: "WS2119E20 board
components" – regions B), Connect one 915MHz antenna to Sub-1GHz U.FL
connector (regions C)
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Doc No: WS2119E20A-UG-D02
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