Low unit price is crucial. To meet this challenge and keep BlueNRG-LP profitable, STMicroelectronics has equipped the SoC with 256 KB of Flash memory. The Bluetooth stack of this device is typically 80KB to 100KB. Thus, developers have around 120KB for their application, which in most cases is sufficient.
The manufacturer optimized the pricing structure by offering three types of packages. QFN32 has 20 GPIOs, while QFN48 and WLCSP49 have 32 and 26 respectively. In addition, BlueNRG-LP variants with half the RAM are also offered. Therefore, teams that only need 32 KB and fewer pins don’t have to pay for more. There are also models that can reach temperatures up to 85 degrees C and 105 degrees C. The latter will be suitable for industrial applications, while others will choose the former and thus save.