HopeRF – CMT4531: ULP Bluetooth LE-SoC & HM-BT4531 BLE Low Cost Module

The manufacturer HopeRF, known for its radio components and modules for (almost) all frequency ranges, offers with the CMT4531 a SoC especially for Ultra Low Power Bluetooth LE applications. With the HM-BT4531 also an extreme low cost module is now available

Not only the overall current consumption can be configured to be very low, but it was also ensured that no excessive peak currents occur. These are often a knock-out argument when using coin cells with their relatively high internal resistance, which also increases during use. Anyone who has ever inserted a watch battery instead of the appropriate cell in the car key knows a thing or two about this…

Typical applications for the CMT4531 are hereby:

Active-Tags
Smart Meter

Home-IoT
Sensors

Tracker / Beacons
Devices w. Energy-Harvesting

The most important data of the CMT4531 Bluetooth LE radio at a glance

BLE 5.2 and SIG Mesh Support
+6 dBm maximum transmitting power
-96 dBm @BLE 1 Mbps RX sensitivity
Radio receive current: 3.8 mA@3.3 V
Radio Transmit current: 4.2 mA @0 dBm/3.3 V
Sleep Mode (48 kB RAM retention): 1.4 μA@3 V
Power Down Mode: 130 nA
Power of programmable transmitter: +6 dBm
Operation power supply: 1.8 V to 3.6 V

The device contains a Cortex-M0 32-bit microcontroller, a RTC with calendar function including leap year compensation, an infrared transmit controller for all remote control protocols, Cyclic Redundancy Check hardware (CRC16 and CRC32), a fast ADC (10-bit@1.33 Msps) with differential input and PGA and much more.

Further, general specification for the CMT4531: ULP Bluetooth LE-SoC

Cortex-M0 Core @ up to 64 MHz
256 kB Flash / 48 kB SRAM
Temperature range: -40°C to 85°C

Package Types: QFN32 (4 mm × 4 mm)
ESD internal protection: ±2 kV (HBM)
Ordering Part No. CMT4531-EQR

HM-BT4531 – BLE Module based on CMT4531

The key facts of the HM-BT4531 follow the CMT4531 specification shown above. It comes with a small meachanical footprint of 17 mm x 12 mm x 2.6 mm and integrates an PCB antenna. Its dedicated use is together with an host connected via UART (baud rate: 9,6 kbps up to 500 kbps) to be controlled with AT commands. It supports LE 1M/2M PHY and LE Coded PHY according Bluetooth LE 5.2 protocol and Bluetooth Mesh. It is certified against CE (EU), FCC (USA), ISED (Canada), SRRC (China).

This makes it perfect for low cost applications with need for a local wireless link via Bluetooth LE. Because of its very low power consumption of 130nA in power down mode and 1.4µA in sleep mode with RAM retention makes ideal for battery powered devices or sensors. More details can be found in the datasheet HM-BT4531 and user manual for HM-BT4531.

Please contact us directly if you require detailed documentation, samples or advice on our wide range of wireless components, modules and matching antennas. You can also send us your request in the following form – we will contact you as soon as possible.

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