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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3955 датащи(PDF) 26 Page - ams AG |
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AS3955 датащи(HTML) 26 Page - ams AG |
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26 / 111 page  Page 26 ams Datasheet Document Feedback [v1-01] 2015-Apr-29 AS3955 − Detailed Description Memory Organization AS3955 contains an embedded EEPROM module which can be accessed via RF or SPI / I²C interface. EEPROM contains 4096 bits (512 bytes) organized in 128 blocks of 4 bytes each. Blocks in EEPROM are numbered from 00h to 7Fh. Bits in a block are numbered from 0 to 31. Most of the EEPROM is NFC Type 2 Tag user data area (472 bytes). The position of the dynamic lock bits is fixed at the end of NFC Type 2 Tag user data area (blocks 7Ah and 7Bh). The configuration bits which define AS3955 operating options are stored in blocks 01h, 7Ch, 7Dh, 7Eh, 7Fh. Housekeeping information is stored in block 00h. 4kbit EEPROM organization is shown in Figure 27. AS3955 is also available in 2kbit version. In this case the data area is reduced to 216 byte. AS3955 internal user memory implements static and dynamic lock bits according to NFC Forum Type 2 Tag standard. Configuration and lock bits, as well as the full 2kbit EEPROM organization, are shown in Figure 28. 4kbit EEPROM Organization Numbers of dynamic lock bits: • Data area size in bytes: 4*(127 – 3) – 7 – 17 = 472 bytes • Number of dynamic lock bits: (472 – 48) / 8 = 53 bits (53 bits) |
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