Chapter 1 Product Overview
1.1 Product Introduction
The EWM550-7G9T10SP is a new domestic Ultra-Wideband (UWB) wireless ranging module from Ebyte. It supports UART serial communication. It defaults to the 7737.2~8237.2MHz frequency band (CH9), with a center frequency of 7987.2MHz and a bandwidth of 499.2MHz. The EWM550-7G9T10SP provides UART-based general AT commands and flexible parameter configuration capabilities. Users can configure various module parameters according to their needs.
1.2 Features and Functions
- Domestic chip solution, utilizing the domestic MK8000 chip.
- Maximum communication distance up to 130m (CH9 frequency band, under clear, open-sky conditions at maximum power).
- Supports serial communication, can output ranging information via serial port.
- Supports AT command parameter configuration.
- On-board antenna design.
- Stamp hole package, dimensions only 14*24mm.
- Low cost, flexible application.
- Industrial-grade design, supports long-term operation from -40 to +85℃.
1.3 Application Scenarios
- Ranging management
- Pet positioning
- Following positioning
- Transportation
- Industrial production
- Petrochemical and mining positioning
Diagram Description (Page 4): An image shows the EWM550-7G9T10SP module, identified by the Ebyte brand. It indicates the manufacturer as Ebyte and includes a placeholder for a serial number.
Chapter 2 Working Parameters
2.1 Specification Parameters
| Parameter Name | Parameter Value | Remark |
| Working Frequency Band | 7737.2~8237.2MHz (CH9) | Default CH9, configurable to CH5 |
| Transmit Power | 10dBm | @3.3V, Channel 9, maximum transmit power |
| Antenna Form | PCB on-board antenna | Dedicated antenna design |
| Package Type | SMD | Stamp hole (1.27mm pitch) |
| Interface Type | Pin header | Supports AT command |
| Communication Interface | UART serial port | |
| UART Configuration | 921600bps 8N1 | |
| Ranging Algorithm | TWR | |
| Ranging Distance | 130m | Under clear, open-sky conditions |
| Ranging Accuracy | 30cm | |
| Outline Dimensions | 14 * 24 mm | |
| Working Voltage (V) | Min: ≥1.8, Typical: 3.3, Max: ≤3.6 | Ensure output power at 3.3V, exceeding 3.6V risks damage |
| Working Temperature (℃) | Min: -40, Max: +85 | Industrial-grade design |
| Working Humidity (%) | Min: 10, Max: 90 | |
| Sleep Current (uA) | Typical: 8.0 | In power-off mode |
| Transmit Current (mA) | Typical: 43.3 | @3.3V, transmitting at maximum power |
| Receive Current (mA) | Typical: 6.6 |
2.2 UART Configuration Parameters
The UART baud rate is 921600bps, with 8 data bits, 1 stop bit, and no parity.
| Item | Parameter Value |
| Baud Rate | 921600 bps |
| Data Bits | 8 |
| Stop Bits | 1 |
| Parity | None |
Chapter 3 Mechanical Dimensions and Pin Definition
3.1 EWM550-7G9T10SP Mechanical Dimensions and Pin Definition
Diagram Description: The module has a rectangular shape with dimensions of 14mm (length) x 24mm (width). It features 26 pins arranged in two rows on the bottom, with a pin pitch of 1.27mm. The top pads are approximately 0.50 x 1.00 mm, and the bottom pads are approximately 0.80 x 1.50 mm.
| Pin No. | Pin Name | Pin Direction | Pin Function |
| 1 | GND | - | Module Ground |
| 2 | GND | - | Module Ground |
| 3 | RSTN | Input | Reset Pin, active low reset |
| 4 | IO0 | - | Reserved Pin |
| 5 | IO1 | - | Reserved Pin |
| 6 | IO2 | Input | When powered on, pull low for 1 second to restore factory settings |
| 7 | IO3 | - | Reserved Pin |
| 8 | IO4 | - | Reserved Pin |
| 9 | GND | - | Module Ground |
| 10 | GND | - | Module Ground |
| 11 | TXD | Output | Data UART |
| 12 | RXD | Input | Data UART |
| 13 | IO7 | - | Reserved Pin |
| 14 | IO8 | - | Reserved Pin |
| 15 | IO9 | - | Reserved Pin |
| 16 | IO10 | - | Reserved Pin |
| 17 | VCC | - | Power Input |
| 18 | VCC | - | Power Input |
| 19 | IO11 | - | Reserved Pin |
| 20 | IO12 | - | Reserved Pin |
| 21 | IO13 | - | Reserved Pin |
| 22 | IO14 | - | Reserved Pin |
| 23 | SWCLK | Input | Programming Interface |
| 24 | SWDIO | Input | Programming Interface |
| 25 | WKP | Input | Sleep Wake-up Pin, active low to wake up module |
| 26 | GND | - | Module Ground |
Chapter 4 Recommended Connection Diagram
Diagram Description: The diagram illustrates the connection between the EWM550 module and a Microcontroller Unit (MCU). The VCC and GND pins of the EWM550 are connected to the MCU's VCC and GND, respectively. The TXD pin of the EWM550 connects to the RXD pin of the MCU, and the RXD pin of the EWM550 connects to the TXD pin of the MCU. Optional connections include WKP to a GPIO pin for wake-up and RSTN to a RESET pin for module reset. Decoupling capacitors are shown connected between VCC and GND on the EWM550.
Chapter 5 Commands and Factory Parameters
5.1 AT Command Table
| No. | Command | Description |
| 1 | +++ | Enter AT Mode |
| 2 | AT+EXIT | Exit AT Mode |
| 3 | AT+ROLE | Query/Set Role |
| 4 | AT+CH | Query/Set Channel |
| 5 | AT+BAUD | Query/Set Baud Rate |
| 6 | AT+POWER | Query/Set Power Level |
| 7 | AT+SLEEP | Enter Sleep Mode |
| 8 | AT+SRCADDR | Query/Set Source Address |
| 9 | AT+DSTADDR | Query/Set Destination Address |
| 10 | AT+INTV | Query/Set Print Interval |
| 11 | AT+RESTORE | Restore Factory Settings |
| 12 | AT+RESET | Reset |
| 13 | AT+VERSION | Query Version Number |
5.2 AT Command Description
5.2.1 Enter AT Mode
Command: +++. Response: AT_MODE. Example: Send +++, Receive AT_MODE. Note: Ranging information printing pauses when entering AT mode and resumes upon exiting.
5.2.2 Exit AT Mode
Command: AT+EXIT. Response: No return. Example: Send AT+EXIT, Receive No return. Note: Exiting AT mode resumes printing ranging information.
5.2.3 Query/Set Role
Query: AT+ROLE=? -> ROLE:<role> (e.g., ROLE:0). Set: AT+ROLE=<role> -> +OK (e.g., AT+ROLE=1 -> +OK). <role>: 0 = Responder Tag, 1 = Initiator Base Station.
5.2.4 Query/Set Channel
Query: AT+CH=? -> CH:<channel> (e.g., CH:9). Set: AT+CH=<channel> -> +OK (e.g., AT+CH=9 -> +OK). <channel>: 5 for CH5, 9 for CH9.
5.2.5 Query/Set Baud Rate
Query: AT+BAUD=? -> BAUD:<baud rate> (e.g., BAUD:7). Set: AT+BAUD=<baud rate> -> +OK (e.g., AT+BAUD=0 -> +OK). <baud rate> options: 0-9600, 1-19200, 2-38400, 3-57600, 4-115200, 5-230400, 6-460800, 7-921600, 8-1000000, 9-2000000.
5.2.6 Query/Set Power Level
Query: AT+POWER=? -> POWER:<power level> (e.g., POWER:<3>). Set: AT+POWER=<power level> -> +OK (e.g., AT+POWER=1 -> +OK). <power level>: 0-3 (4 levels total), level 3 is maximum power.
5.2.7 Sleep Mode
Command: AT+SLEEP=<sleep parameter> -> +OK (e.g., AT+SLEEP=0 -> +OK). <sleep parameter>: 0 = Power-off mode (UWB stops all operations). 1 = Periodic sleep mode (UWB outputs normally with low power, serial port inactive). Note: Pulling the WKP pin low wakes up the module.
5.2.8 Query/Set Source Address
Query: AT+SRCADDR=? -> SRC_ADDR:<source address> (e.g., SRC_ADDR:1111). Set: AT+SRCADDR=<source address> -> +OK (e.g., AT+SRCADDR=1111 -> +OK). <source address>: Range 0000-FFFF (works with DSTADDR).
5.2.9 Query/Set Destination Address
Query: AT+DSTADDR=? -> DST_ADDR:<destination address> (e.g., DST_ADDR:2222). Set: AT+DSTADDR=<destination address> -> +OK (e.g., AT+SRCADDR=2222 -> +OK). <destination address>: Range 0000-FFFF. Note: If ROLE=1's DSTADDR matches ROLE=0's SRCADDR, only RSSI is output, not distance.
5.2.10 Query/Set Print Interval
Query: AT+INTV=? -> INTV:<print interval> (e.g., INTV:500). Set: AT+INTV=<print interval> -> +OK (e.g., AT+INTV=1000 -> +OK). <print interval>: Value range 20-2000ms.
5.2.11 Restore Factory Settings
Command: AT+RESTORE -> +OK. Example: Send AT+RESTORE, Receive +OK.
5.2.12 Reset
Command: AT+RESET -> +OK. Example: Send AT+RESET, Receive +OK.
5.2.13 Query Version Number
Command: AT+VERSION -> VERSION:7530-0-10. Example: Send AT+VERSION, Receive VERSION:7530-0-10.
Chapter 6 Hardware Design
6.1 Hardware Design
Recommendations for power supply: Use a regulated DC power supply with minimal ripple and ensure reliable grounding.
Polarity: Ensure correct power supply polarity to prevent permanent damage.
Voltage: Verify the power supply is within the recommended range; exceeding the maximum can cause permanent damage.
Stability: Ensure power supply stability and avoid frequent voltage fluctuations.
Margin: Reserve at least 30% power supply margin for stable system operation.
EMI Avoidance: Keep the module away from EMI sources like power supplies, transformers, and high-frequency traces.
Layout Guidelines: High-frequency digital, analog, and power traces should avoid passing directly under the module. If unavoidable, use ground copper on the Top Layer under the module's contact points and route on the Bottom Layer near the module's digital section. Arbitrary routing on lower layers can affect spurious emissions and sensitivity.
Component Placement: Keep the module away from components that generate significant EMI; use shielding if necessary.
Trace Routing: Similarly, keep the module away from noisy traces; use shielding if necessary.
Antenna Placement: Ensure the antenna is exposed and oriented vertically upwards for optimal performance.
Enclosure Installation: Use an extension cable to move the antenna outside the enclosure if needed.
Metal Enclosures: Never install the antenna inside a metal enclosure, as it severely reduces transmission distance.
Chapter 7 Common Problems
7.1 Module No Response on Power-up
- Obstacles in line-of-sight can reduce communication distance.
- Temperature, humidity, and co-channel interference increase packet loss.
- Testing near the ground can be affected by ground wave absorption/reflection.
- Seaside testing can be poor due to seawater's radio wave absorption.
- Metal objects near the antenna or within a metal enclosure cause significant signal attenuation.
- Incorrect power register settings or excessively high air data rates reduce range.
- Low supply voltage (below recommended) reduces transmit power.
- Poor antenna matching or antenna quality issues.
7.2 Module Easily Damaged
- Verify power supply voltage is within range; overvoltage causes permanent damage.
- Ensure power supply stability; avoid frequent voltage fluctuations.
- Handle with anti-static precautions; components are static-sensitive.
- Avoid high humidity; some components are humidity-sensitive.
- Avoid extreme temperatures unless specifically required.
7.3 Transmission Distance Shortened/Reduced
- Module performance degradation (low transmit power, reduced receiver sensitivity) may require repair.
- Check antenna connection for looseness, corrosion, or damage; secure or replace the antenna.
- Address new interference sources by changing channels or adjusting/upgrading the antenna.
Chapter 8 Soldering Operation Guide
8.1 Reflow Soldering Temperature
| Profile Feature | Sn-Pb Assembly (Sn63/Pb37) | Pb-Free Assembly (Sn96.5/Ag3/Cu0.5) |
| Solder Paste | Tin paste | Tin paste |
| Preheat Temperature min (Tsmin) | 100°C | 150°C |
| Preheat temperature max (Tsmax) | 150°C | 200°C |
| Preheat Time (Tsmin to Tsmax) (ts) | 60-120 sec | 60-120 sec |
| Average ramp-up rate (Tsmax to Tp) | 3°C/second max | 3°C/second max |
| Liquidous Temperature (TL) | 183 °C | 217°C |
| Time (tL) Maintained Above (TL) | 60-90 sec | 30-90 sec |
| Peak temperature (Tp) | 220-235°C | 230-250°C |
| Average ramp-down rate (Tp to Tsmax) | 6°C/second max | 6°C/second max |
| Time 25°C to peak temperature | 6 minutes max | 8 minutes max |
8.2 Reflow Soldering Curve Diagram
Diagram Description: The diagram shows a typical reflow soldering temperature profile graph. The X-axis represents time, and the Y-axis represents temperature. The profile includes distinct stages: Preheat (from 25°C to Tsmin, then to Tsmax), Ramp-up (from Tsmax to Tp), Soak/Liquidous (maintaining temperature at TL for time tL), Peak Temperature (Tp), and Ramp-down (from Tp to Tsmax). Key temperature points (Tsmin, Tsmax, TL, Tp) and time intervals (ts, tL, tp, 25°C to Peak) are indicated. The 'Critical Zone' is highlighted between TL and Tp.
Revision History
| Version | Revision Date | Revision Description | Maintainer |
| 1.0 | 2025-07-28 | Initial Version | Lei |
About Us
Sales Hotline: 4000-330-990
Official Website: www.ebyte.com
Technical Support: support@cdebyte.com
Company Address: Building B5, Industrial Park, Xiqu Avenue 199, High-tech West Zone, Chengdu, Sichuan Province.
Company Logo: Chengdu Ebyte Electronic Technology Co.,Ltd.
