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MAX66040K Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX66040K Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 25 page Detailed Description The MAX66040 combines 1024 bits of user EEPROM, 128 bits of user and control registers, a 64-bit UID, one 64-bit secret, a 512-bit SHA-1 engine, and a 13.56MHz RF interface (ISO/IEC 14443 Type B, Parts 2-4) in a sin- gle chip. The memory is organized as 19 blocks of 8 bytes each. Except for the secret, each block has a user-readable write-cycle counter. Four adjacent user EEPROM blocks form a memory page (pages 0 to 3). Memory protection features include write protection and EPROM emulation, which the user can set for each individual memory page. Page 3 can also be read pro- tected for enhanced authentication strength. The MAX66040 is accessed through the ISO/IEC 14443-4 block transmission protocol, where requests and responses are exchanged through I-blocks once a device is in the ACTIVE state. The reader must support a frame size of at least 26 bytes. The data rate can be as high as 847.5kbps. The MAX66040 supports AFI and CID. Functions not supported are chaining, frame- waiting time extension, and power indication. Applications of the MAX66040 include driver identifica- tion (fleet application), access control, electronic cash (e-cash), and asset tracking. Overview Figure 1 shows the relationships between the major control and memory sections of the MAX66040. The device has six main data components: 64-bit UID, 64-bit read/write buffer, four 256-bit pages of user EEPROM, two 8-byte blocks of user and control regis- ters, 64-bit secret’s memory, and a 512-bit SHA-1 engine. Figure 2 shows the hierarchical structure of the ISO/IEC 14443 Type B-compliant access protocol. The master must first apply network function commands to put the MAX66040 into the ACTIVE state before the memory and control functions become accessible. The protocol required for these network function commands is described in the Network Function Commands sec- tion. Once the MAX66040 is in the ACTIVE state, the master can issue any one of the available memory and control function commands. Upon completion of such a command, the MAX66040 returns to the ACTIVE state and the master can issue another memory and control function command or deselect the device, which returns it to the HALT state. The protocol for these memory and control function commands is described in the Memory and Control Function Commands section. All data is read and written least significant bit (LSb) first, starting with the least significant byte (LSB). Parasite Power As a wireless device, the MAX66040 is not connected to any power source. It gets the energy for operation from the surrounding RF field, which needs to have a minimum strength as specified in the Electrical Characteristics table. RF FRONT- END VOLTAGE REGULATOR INTERNALSUPPLY MEMORY AND FUNCTION CONTROL ISO 14443 FRAME FORMATTING AND ERROR DETECTION READ/WRITE BUFFER SECRET UID REGISTER BLOCK USER EEPROM SHA-1 ENGINE fc DATA MODULATION Figure 1. Block Diagram ISO/IEC 14443 Type B-Compliant Secure Memory _______________________________________________________________________________________ 3 ABRIDGED DATA SHEET |
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