The JMY-680 series RF read-write module is a micro-embedded non-contact IC card read-write module designed using PHILIPS' non-contact technology. It has automatic card detection function and a built-in 512-byte EEPROM.
The JMY-680S is a compact RFID reader module that uses Philips non‑contact technology to read Mifare cards. It includes an automatic card‑search function, a 512‑byte EEPROM for data storage, and supports both UART and I²C communication interfaces.
The manual describes the communication protocols (UART, I²C, Wiegand), command formats, and provides example command sequences for reading, writing, and managing cards. It also lists the supported card types and interface voltage levels (TTL or RS‑232). This manual is written in Chinese.
| EEPROM size | 512 bytes |
|---|---|
| Supported interfaces | UART (TTL or RS‑232) and I²C |
| I²C communication speed | 400 kHz |
| Automatic card detection | Enabled, indicates card presence via ICC pin level |
The module includes a 512‑byte EEPROM for storing application data.
Check the level of the ICC pin; a change indicates that a card is within the antenna area.