BlueNRG-1 bluetooth without hassle

MicroCrystal RV-8803 – A Really Accurate RTC June 17, 2019- RTC chips traditionally were the domain of Maxim and NXP. Switzerland-based MicroCrystal recently made quite a buzz with its RV-8803, which offers simple integration, an I2C interface and extreme accuracy. Let us start out by looking at a system overview. Figure one shows how this I2C RTC is made up internally – interested observers note […]
Analog Devices’ LTM2887 – If a Digital Bus Needs Galvanic Isolation June 15, 2019- In theory, digital buses are intended to connect things to one another. Sadly, one sometimes wants but a logical connection – in many cases, galvanic isolation helps out. Should you ever feel like isolating very fast buses, definitely give the LTM2887 a chance. From a technical point of view, Linear Technologies attempt at entering the […]
AVAGO APDS-9008 or APDS-9005-020 – Keeping an Eye on Ambient Light June 14, 2019- Recent times saw quite a bit of interest for part numbers such as the APDS-9008 or APDS-9005-020 – they are a very interesting type of ambient light sensor. One of the oldest questions in regards to light sensors involves their spectral sensitivity. If a part is to output but one voltage level, the conversion between […]
STMicroelectronics’ LIS2DH12 – Low Power Motion Sensing June 12, 2019- Apple’s iPhone introduced gyroscopic sensors to a wider range – before that, accelerometers were not commonly found in consumer hardware. STM sells excellent parts which, however, get little media attention – time to take a look at the LIS2DH12. Integrating the part into your circuit as an MPU6500 alternative or MPU9500 alternative is not difficult. […]
Panasonic AMG8833 – FLIR for cheap June 7, 2019- FLIR made infrared thermal sensors cool – sadly, their parts are all but cheap (and suffer from export control problems). Panasonic’s Grid-EYE family is a low-resolution alternative which comes at significantly lower cost. From a technical point of view, Panasonic’s image sensor could not be simpler. We are looking at an 8×8 sensor with an […]
DipTronics DTS-62R-V – Small Switch, Very Big (and Very Cheap) June 5, 2019- When yours truly was but a lowly cadet, various US manufacturers produced (pricey but quite reliable) switches. Chinese vendors recently started to catch up – seeing the DTS-62R-V top our customer interest list shows that the run stage of the crawl-walk-run cycle is reached. DipTronics has been around the Asian switch market for ages, exhibiting […]

Designing and impendance matching RF-related circuitry is an art of its own. STMicroelectronics’s SPBTLE-1S combines a Bluetooth 4.2 radio module with a Cortex-M0 processor intended to handle RF communications.

A look at the block diagram confirms that the module is, by and large, an SoC in a box. Thanks to STM pre-soldering it all onto a planar, certification hassles are avoided (in the USA) or mitigated (in Europe).



The SPBTLE-1S contains all an IoT developer dreams of at night…



Interaction with external hardware can be accomplished via a full complement of GPIO ports, two ADC channels, one SPI and two I2C interfaces. The module, furthermore, has the capability to work as a dedicated Bluetooth 4.2 radio chip being controlled by a seperate microcontroller.

ST Microelectronics prides itself on the module being able to run from a single coin cell or a pair of AAA batteries – any input power ranging from 1-.7V to 3.6V is acceptable. This, sadly, is a problem for hosted mode – interfacing the module with a run of the mill 5V microcontroller requires level switching hardware. Power consumption in active mode is 1.9mA, with a 0.9 Microampere sleep mode also available.

Integrating the module is relatively simple: STMicroelectronics picked a form factor similar to the one used by the various ESP32 modules. This means that even non-sophisticated pick and place houses should not have trouble handling the part – if land geometry is suitable, hand soldering also is possible due to the pads being exposed from both sides.



…the SPBTLE-1S can be soldered by hand



Unlike some other products from STM, the SPBTLE-1S does not stand alone. It, instead, can use almost all example code provided for the BlueNRG platform – getting started with it is as easy as selecting a C program’s skeleton which fits your needs.