1 of 3 special features ? 4096 bits electrically erasable programmable read only memory (eeprom) ? overdrive mode boosts communication speed to 142kbps ? 256-bit scratchpad ensures integrity of data transfer ? memory partitioned into 256-bit pages for packetizing data ? reduces control, address, data and power to a single data pin ? 8-bit family code specifies ds1973 communication requirements to reader ? reads and writes over a wide voltage range of 2.8v to 6.0v from -40c to +85c f3 microcan f5 microcan common i button features ? unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit crc tester) assures absolute identity because no two parts are alike ? multidrop controller for microlan ? digital identification and information by momentary contact ? chip-based data carrier compactly stores information ? data can be accessed while affixed to object ? economically communicates to bus master with a single digital signal at 16.3kbps ? standard 16mm diameter and 1-wire ? protocol ensure compatibility with i button family ? button shape is self-aligning with cup- shaped probes ? durable stainless steel case engraved with registration number withstands harsh environments ? easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim ? presence detector acknowledges when reader first applies voltage ordering information part pin-package ds1973-f3+ f3 microcan DS1973-F5+ f5 microcan + denotes a lead(pb)-free/rohs-compliant package . examples of accessories ds9096p self-stick adhesive pad ds9101 multi-purpose clip ds9093ra mounting lock ring ds9093a snap-in fob ds9092 i button probe ds1973 4kb eeprom i button ? www.maxim-ic.com i button and 1-wire are registered trademark s of maxim integrated products, inc. 19-4889; rev 8/09
ds1973 2 of 3 i button description the ds1973 4kb eeprom i button is a rugged read/write data carrier that identif ies 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 micro-controller. the ds 1973 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 (23h) plus 4096 bits of eeprom. the power to program and read the ds1973 is derived entirely from the 1-wire communication line. the memo ry is organized as sixteen pages of 256 bits each. the 64-bit registration number provides a guarant eed unique identity which allows for absolute traceability. data is transferred serially via the 1-wire protocol which requires on ly a single data lead and a ground return. the durable microcan package is highl y resistant to harsh environments such as dirt, moisture, and shock. its compact bu tton-shaped profile is self-aligni ng with cup-shaped receptacles, allowing the ds1973 to be used easily by human opera tors or automatic equipm ent. accessories permit the ds1973 to be mounted on printed ci rcuit boards, plastic key fobs, ph oto-id badges, id bracelets, and many other objects. applica tions include work-in-prog ress tracking, electronic travelers, access control and storage of calib ration constants. overview the block diagram in figure 1 shows the relationships between the major control and memory sections of the ds1973. the ds1973 has three main data components: 1) 64-bit lasered rom, 2) 256-bit scratchpad, and 3) 4096-bit eeprom. the bus master must first provide one of the rom f unction commands before the memory functions become accessible. all data is read and written least significant bit first. the ds1973 contains the same memory chip as the ds2433. for a full description of the logical behavior, please refer to the ds2433 data sheet. ds1973 block diagram figure 1
ds1973 3 of 3 maxim cannot assume responsibili ty for use of any circuitry other than circuitry entirely embodied in a maxim product. maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim pr oduct. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision date description pages changed 071508 updated the f3 microcan and f5 microcan face brands with the latest per pcn h020201. 1 added the + sign to the part numbers in the ordering information table, indicating lead(pb)-fre e/rohs-compliant packages. 1 8/09 removed the ul#913 bullet from the common i button feature s section. 1
|
