Raytac’s MDBT42Q-P512K is a BT5 and BT4.2 stack (Bluetooth low energy or BLE) module designed based on Nordic nRF52832 SoC solution, which incorporates: GPIO, SPI, UART, I2C, I2S, PWM and ADC interfaces for connecting peripherals and sensors.
About the module:

• 1. Dual Transmission mode of BLE & 2.4Ghz RF upon customer preference.
• 2. Compact size with (L) 16 x (W) 10 x (H) 2.2 mm.
• 3. Low power requirements, ultra-low peak, average and idle mode power consumption.
• 4. Be compatible with a large installed base of mobile phones, tablets and computers.
• 5. Fully coverage of BLE software stack
• 6. BLE & RF transmission switching helps products fit all operation system and most hardware.
• 7. BT5 & BT4.2 Bluetooth Specificaiton Certified
• 8. FCC/IC/CE/Telec/KC/SRRC safety regulation certification granted.FeaturesMulti-protocol 2.4GHz radio
• 32-bit ARM Cortex – M4F processor
• 512KB flash programmed memory and 64KB RAM
• Software stacks available as downloads
• Application development independent from protocol stack
• On-air compatible with nRF51, nRF24AP and nRF24L series
• Programmable output power from +4dBm to -20dBm
• RSSI
• RAM mapped FIFOs using EasyDMA
• Dynamic on-air payload length up to 256 bytes
• Flexible and configurable 32 pin GPIO
• Programmable peripheral interface - PPI
• Simple ON / OFF global power mode
• Full set of digital interface all with Easy DMA including:
• 3 x Hardware SPI master ; 3 x Hardware SPI slave
• 2 x two-wire master ; 2 x two-wire slave
• 1 x UART (CTS / RTS)
• PDM for digital microphone
• I2S for audio
• Quadrature demodulator
• 12-bit / 200KSPS ADC
• 128-bit AES ECB / CCM / AAR co-processor
• Lowe cost external crystal 32MHz ± 40ppm for Bluetooth ; ± 50ppm for ANT Plus
• Lowe power 32MHz crystal and RC oscillators
• Wide supply voltage range 1.7V to 3.6V
• On-chip DC/DC buck converter
• Individual power management for all peripherals
• Timer counter
• 5 x 32-bit
• 3 x 24-bit RTC
• NFC-A tag interface for OOB pairing