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AS3955 bảng dữ liệu(PDF) 35 Page - ams AG |
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AS3955 bảng dữ liệu(HTML) 35 Page - ams AG |
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35 / 111 page  ams Datasheet Page 35 [v1-01] 2015-Apr-29 Document Feedback AS3955 − Detailed Description Configuration Byte AUTH_CNT Figure 37: Configuration Byte AUTH_CNT Note(s) and/or Footnote(s): 1. This byte can always be accessed for read and write via the SPI / I²C and can’t be accessed for read and write from the RF side. This byte indicates the number of allowed unsuccessful authentication attempts over RF available before disabling the chip. The byte consists of two separate counters where the second counter is a copy of the first counter. These counters are updated at each failed authentication. At each successful authentication, counters are reset to 7 and, at each unsuccessful authentication attempt, counters are decreased by one. If the value of the counters reaches 0, the chip will be permanently locked and cannot be authenticated any longer over the RF field. The chip will also be locked in case the two counter values don’t match. The lock can always be cleared via SPI / I²C interface. Conf. Bit Name Default Function Note b7 rfu 0 b6 auth_cnt2<2> 1 Authentication counter 2 b5 auth_cnt2<1> 1 b4 auth_cnt2<0> 1 b3 rfu 0 b2 auth_cnt1<2> 1 Authentication counter 1 b1 auth_cnt1<1> 1 b0 auth_cnt1<0> 1 |
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