HM-BT4502 Bluetooth 5.0 Wireless Pass-Through Module
The HM-BT4502 is an ultra-low-power Bluetooth 5.0 transparent transmission module powered by the CMT4502 BLE core. Engineered for seamless UART pass-through communication between microcontrollers, smartphones, and tablets, it requires zero Bluetooth stack programming experience, delivers 2M symbol transmission, and integrates complete AT command/mobile app parameter controls with anti-hijacking security.
Bluetooth 5.0 (BLE)
< 4 µA @ 3V
1.8V to 3.6V DC
-20 dBm to +8 dBm
-97 dBm
2M Symbol / GFSK
| Product Model / Core | HM-BT4502 / CMT4502 Low-Power BLE 5.0 ASIC |
| Frequency & Modulation | 2402 MHz – 2480 MHz | GFSK (Gaussian Frequency Shift Keying) |
| Serial Interface | Full-duplex universal serial port, minimum 9600 bps baud rate support, up to 240 bytes packet auto-distribution |
| Dynamic Current Profile | TX Transient: < 8 mA @ 3V (0 dBm) | RX Transient: < 8 mA @ 3V | Low Power Mode: < 4 µA @ 3V |
| Connection & Transmission | Default 30 ms rapid connection interval; supports 244-byte packet transmission & 2M symbol PHY |
| Configuration Interfaces | Comprehensive AT Command set + Mobile Device App support for runtime parameter reconfiguration |
| Hardware Peripherals | Full I/O expansion break-out, dedicated debug port, and integrated Real-Time Clock (RTC) |
| Security & Broadcasting | Anti-hijacking password protection; dynamic real-time broadcast of battery level & device ID |
| Operating Temperature | -20°C to +85°C |
Din-Rail Modem USR-DR502-CT 





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