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DS1925 bảng dữ liệu(PDF) 23 Page - Maxim Integrated Products |
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DS1925 bảng dữ liệu(HTML) 23 Page - Maxim Integrated Products |
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23 / 46 page ![]() Figure 9c. Memory/Control Function Flowchart—XPC Subcommands Flowchart (continued) DS1925 iButton High-Capacity Temperature Logger with 122KB Data-Log Memory www.maximintegrated.com Maxim Integrated │ 23 99h XPC COPY SCRPD. BBh XPC STOP MISSION? FROM FIGURE 9 2nd PART, XPC N MASTER Rx CRC16 MASTER Tx TA1 (T7:T0), TA2 (T15:T8) MASTER WAITS (tLSTD OR tLSTD + tSRTC) + * MASTER Tx FFh RELEASE BYTE DS1925 COPIES SCRATCHPAD DATA TO MEMORY MASTER WAITS tSTD * MASTER Tx E/S BYTE MASTER Rx REPEAT RESULT BYTE PASSWORD ACCEPTED? N Y N Y Y N *STRONG PULLUP REQUIRED MASTER Tx 64-BITS [PASSWORD] MASTER Tx RESET? MASTER Tx 64-BITS [PASSWORD] MASTER Rx CRC16 MASTER Tx FFh RELEASE BYTE DS1925 SETS MIP = 0, WFTA = 0, WRITE STOP RTC VALUE TO MISSION BACKUP MASTER Rx REPEAT RESULT BYTE PASSWORD ACCEPTED? N Y Y N MASTER Tx RESET? +ANY DS1925 DEVICE THAT IS IN AN UNKNOWN STATE SHOULD BE ASSUMED TO REQUIRE THE ADDITIONAL DELAY OF tSRTC TO ENSURE PROPER OPERATION UNTIL THE DEVICE STATE IS ESTABLISHED BY COMMAND OR QUERY. FAILURE TO DO SO MAY CAUSE THE DEVICE TO EXPERIENCE A POWER-ON RESET OR BATTERY-FAIL EVENT, SET THE BOR ALARM FLAG, AND DISABLE DEVICE FEATURES. AUTH CODE |
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