卓优电子封装的TM1971-F5 采用进口原装芯片DS2430AP封装，性能及功能完全兼容DALLAS iButton DS1971-F5  内存256位,32字节,EEPROM存储方式(需订购)!一般柜锁梯控门禁用的比较多、可读写.大小如同纽电池，不锈钢金属包装,内部固化数据信息芯片、极具强韧性、不锈钢金属片（它的作用是把芯片和金属外壳相连接，并把顶部金属外壳定为正极，把周边部分的金属外壳定为负极。）
256-bit EEPROM iButton is a rugged read/write data carrier that idenTIfies and stores relevant informaTIon about the product or person to which it is attached. This informaTIon can be accessed with minimal hardware: for example, a single port pin of a microcontroller. The DS1971 consists of a factory-lasered registraTIon number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (14H) plus 256 bits of EEPROM. The power to program and read the DS1971 is derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. The 48-bit serial number that is factory-lasered into each DS1971 provides a guaranteed unique identity which allows for absolute traceability. The durable MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact button-shaped profile is self-aligning with cup-shaped receptacles, allowing the DS1971 to be used easily by human operators or automatic equipment. Accessories permit the DS1971 to be mounted on printed circuit boards, plastic key fobs, photo-ID badges, ID bracelets, and many other objects. Applications include work-in-progress tracking, electronic travelers, access control and storage of calibration constants.