The DS1972-F5+ is a 1024bit EEPROM iButton in a rugged F5 iButton package. This 1-wire EEPROM chip is organized as four memory pages of 256bits each. Data is written to an 8byte scratchpad, verified and then copied to EEPROM memory. The four memory pages can individually be write protected or put in EPROM emulation mode where bits can only be changed from 1 to 0 state. Chip based data carrier stores digital identification and information. It is armoured in durable stainless steel case. The DS1972 communicates over single conductor 1-wire bus. The communication follows standard 1-wire protocol. Each device has its own unalterable and unique 64bit ROM registration number that is factory lasered into the device. The registration number is used to address the device in a multidrop, 1-wire net environment. The device is used in access control/parking meter, work in progress tracking, tool management, inventory control and maintenance/inspection data storage applications.
- Reads and writes over a wide voltage range from 2.8V to 5.25V from -40°C to 85°C
- Communicates to host with single digital signal at 15.4Kbps or 125Kbps using 1-wire protocol
- Button shape is self aligning with cup shaped probes
- Presence detector acknowledges when reader first applies voltage
- Switchpoint hysteresis and filtering to optimize performance in presence of noise
- IEC 1000-4-2 level 4 ESD protection (±8KV contact, ±15KV air)
- Data can be accessed while affixed to object
- Programming current of EEPROM is 0.8mA and programming time of EEPROM is 10ms
- 40 years EEPROM data retention
嵌入式设计与开发
