BLE Micro

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Contents

Introduction

The BLE Mcicro is a low cost ARM cortex-m0 based module for Bluetooth® Smart designs with the nRF51822 SoC. The module gives access to at most 23 GPIO pins via pin pads and incorporates an on board PCB antenna to minimize material cost but also with a good performance.The application engineers can easily apply the module for theirs application without worrying about the specific impedance matching or soldering fine pitch related radio designing issues.

Features

  • Multi-protocol 2.4GHz radio
  • 32-bit ARM Cortex M0 processor
  • 256kB flash/16kB RAM
  • Programmable output power from +4dBm to -20dBm
  • Flexible and configurable 23 pin GPIO
  • Wide supply voltage range (1.8 V to 3.6 V)
  • RSSI

Specification

Specification Value
Microprocessor nRF51822 based on 32-bit ARM Cortex M0
Outline Dimension 13.0mm x 18.5mm x 2.3mm
Power supply 3.3V
On-air data rate 250 kbps, 1 Mbps or 2 Mbps
Modulation GFSK
Output power Programmable: +4 to -20dBm in 4dB steps
Sensitivity

-92.5dBm Bluetooth low energy
-96dBm at 250kb
-90dBm at 1Mbs
-85dBm at 2Mbs

Radio current consumption LDO at 1.8V

16mA – TX at +4dBM output power
10.5mA – TX at 0dBm output power
13mA – RX at 1Mbs

Radio current consumption DC-DC at 3V

10.5mA – TX at +4dBm output power
8.1mA – TX at 0dBm output power
9.5mA – RX at 1Mbs

System current consumption

420nA – No RAM retention
530nA - 8k RAM retention
2μA – All peripherals in IDLE mode

Hardware Security 128-bit AES ECB/CCM/AAR co-processor
GPIO 23
Peripherals

10-bit ADC
Temperature sensor
RTC
RNG

Pinout

Bottom view of BLE Micro:

BLE Micro Pinout.png

Note: the pin SWDIO is also nRESET.

Dimension

BLE Micro Dimension.jpeg

Over-The-Air

There are two batches of BLE Micro modules, one with Nordic S110 SoftDevice 6.0 and "DfuTarg" BLE device name, one with S110 SoftDevice 7.0 and "SD7DFU" BLE device name. The BLE Micro has a pre-flashed OTA bootloader. To enter OTA mode:

  1. connect p18 of the BLE Micro to GND
  2. power on the BLE Micro
  3. a BLE device named DfuTarg (with SoftDevice 6.0) or SD7DFU (with SoftDevice 7.0) can be scaned
  4. use nRF Master Control Panel to upgrade the BLE app

Ota-ui.png

Download & Debug through SWD interface

We can download and debug new application of BLE Micro with an Arch BLE or a J-Link through SWD interface. The Arch BLE is a BLE Micro + a CMSIS DAP interface which provides features like drag-n-drop programming, debug and USB virtual serial port communication.

Using arch ble to flash ble micro.png

Develop Applications

Go to Seeedstudio mbed BLE project (or SoftDevice 6.0 branch to start developing. After you get your custom application hex file, use OTA to upgrade your BLE Micro.

If you are familiar with the Docker, there is a Docker container created by Paul for you to setup toolchain quickly. You can use the Dockerfile to get started.

If you have an Arch BLE, you can also use ARM mbed cloud-based IDE. See also Arch BLE wiki

BLE UART

By default, the BLE Micro is acted as a BLE to UART device. It can be connected to Android or iOS.

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