E49-900MBL-01 is a professional-grade 900MHz wireless evaluation suite designed for rapid prototyping. Featuring an integrated USB-to-UART interface and a low-power STM8L MCU, it provides an ideal platform for testing CMT2300A-based SPI wireless modules. The board's full-pin breakout design ensures seamless jumper connections for diverse peripheral expansion.
| Technical Parameter | Specifications |
|---|---|
| Model Number | E49-900MBL-01 |
| Supported RF Chip | CMT2300A (Sub-1GHz) |
| Operating Frequency | 900 MHz |
| Control Interface | USB (Micro-USB) |
| Onboard Controller | STM8L MCU |
| Pin Access | Full Breakout Design (Standard Header) |
| Weight | 45.3 ± 0.1g |
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Main Parameters
| Pin | Name | Functions |
|---|---|---|
| 1 & 2 | VCC & 3.3V | Module power supply. Note: Pin 1 must be short-connected to Pin 2. |
| 3 & 4 | 3.3V & VIO | MCU logic power. Short-connect Pin 3 and Pin 4 to supply the STM8L MCU. |
| 10 - 13 | SPI Interface | Includes MISO (PB7), MOSI (PB6), SCLK (PB5), and NSS (PB4) for module communication. |
| 14 & 15 | UART Interface | MCU Serial TXD and RXD for data transmission and debugging. |
| 16 & 18 | M1 & M0 | Mode switching pins. Refer to specific module datasheet for configuration. |
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Application
Rapid Wireless Sensor Prototyping
For industrial automation integrators, the E49-900MBL-01 acts as a bridge to quickly validate CMT2300A RF link quality. The plug-and-play USB interface eliminates the need for complex breadboard wiring, allowing engineers to focus on verifying RSSI and packet loss in noisy factory environments.
Smart Metering Firmware Debugging
Developers working on Sub-1GHz utility meters can utilize the integrated STM8L MCU to simulate real-world data transmission. The board's full-pin breakout design allows for easy connection to logic analyzers, solving the pain point of troubleshooting SPI timing issues during high-speed data bursts.
Production Line RF Validation
E49-900MBL-01 serves as an ideal hardware reference for factory testing stations. By leveraging the 900MHz optimized circuitry, manufacturers can ensure that CMT2300A modules meet sensitivity standards before final assembly, reducing the failure rate of the finished IoT products.
Frequently Asked Questions
Q: How does the E49-900MBL-01 manage power domain isolation between the USB 5V and the module's 3.3V requirement?
A: The board integrates a high-efficiency Low Dropout Regulator (LDO) that regulates the 5V USB input down to a stable 3.3V DC rail. This power management circuit is designed with low-ESR decoupling capacitors to minimize ripple current, which is essential for maintaining the RF sensitivity of the CMT2300A chip during high-power transmission phases.
Q: What are the impedance considerations for the RF signal path on this evaluation board?
A: The RF output trace from the CMT2300A module pads to the antenna connector is engineered as a 50-ohm coplanar waveguide. This precise impedance matching prevents signal reflections and ensures maximum power transfer at the 900MHz frequency band, allowing engineers to measure the true performance of the module without parasitic board losses.
Q: Can the onboard STM8L MCU be bypassed to allow an external controller to drive the CMT2300A SPI interface?
A: Yes, the E49-900MBL-01 features a jumper-based full-pin breakout design. By removing specific shorting blocks, developers can isolate the onboard STM8L MCU and connect an external microcontroller or industrial PLC directly to the SPI pins. This allows for logic level transition testing and validation of third-party driver stacks.
