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DS1921Z Datasheet(PDF) 38 Page - Maxim Integrated Products |
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DS1921Z Datasheet(HTML) 38 Page - Maxim Integrated Products |
38 / 45 page DS1921H/Z 38 of 45 STEP 3 In this example, the rollover is disabled and the search condition is set for a high temperature only. The mission is to start with a delay of 90 (005Ah) minutes and the alarm flags TLF, THF, and TAF are cleared. This results in the following data to be written to the special function registers: Address: 20Eh 20Fh 210h 211h 212h 213h 214h Data: 02h 00h* 00h* 00h* 5Ah 00h 00h * Writing through address locations 20Fh to 211h is faster than accessing the Mission Start Delay Register in a separate cycle. The write attempt has no effect on the contents of these registers. With only a single DS1921H/Z connected to the bus master, the communication of step 3 is as follows: MASTER MODE DATA (LSB FIRST) COMMENTS TX (Reset) Reset pulse (480μs to 960µs) RX (Presence) Presence pulse TX CCh Issue Skip ROM command TX 0Fh Issue Write Scratchpad command TX 0Eh TA1, beginning offset = 0Eh TX 02h TA2, address = 020Eh TX <7 data bytes> Write 7 bytes of data to scratchpad TX (Reset) Reset pulse RX (Presence) Presence pulse TX CCh Issue Skip ROM command TX AAh Issue Read Scratchpad command RX 0Eh Read TA1, beginning offset = 0Eh RX 02h Read TA2, address = 020Eh RX 14h Read E/S, ending offset = 14h, flags = 0h RX <7 data bytes> Read scratchpad data and verify TX (Reset) Reset pulse RX (Presence) Presence pulse TX CCh Issue Skip ROM command TX 55h Issue Copy Scratchpad command TX 0Eh TA1 TA2 (AUTHORIZATION CODE) E/S TX 02h TX 13h TX (Reset) Reset pulse RX (Presence) Presence pulse |
Similar Part No. - DS1921Z |
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Similar Description - DS1921Z |
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