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DS1921G-F5 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1921G-F5 Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 42 page  Thermochron iButton 8 _______________________________________________________________________________________ AVAILABLE COMMANDS: COMMAND CODES: DATA FIELD AFFECTED: READ ROM MATCH ROM SEARCH ROM SKIP ROM OVERDRIVE-SKIP ROM OVERDRIVE-MATCH ROM CONDITIONAL SEARCH ROM 33h 55h F0h CCh 3Ch 69h ECh 64-BIT ROM 64-BIT ROM 64-BIT ROM N/A OD-FLAG 64-BIT ROM, OD-FLAG 64-BIT ROM, CONDITIONAL SEARCH SETTINGS, DEVICE STATUS 1-Wire ROM FUNCTION COMMANDS WRITE SCRATCHPAD READ SCRATCHPAD COPY SCRATCHPAD READ MEMORY READ MEMORY WTH CRC CLEAR MEMORY CONVERT TEMPERATURE 0Fh AAh 55h F0h A5h 3Ch 44h 256-BIT SCRATCHPAD, FLAGS 256-BIT SCRATCHPAD 4096-BIT SRAM, REGISTERS, FLAGS ALL MEMORY ALL MEMORY MISSION TIMESTAMP, MISSION SAMPLES COUNTER, START DELAY, SAMPLE RATE, ALARM TIMESTAMPS AND DURATIONS, HISTOGRAM MEMORY MEMORY ADDRESS 211h DS1921G-SPECIFIC MEMORY/CONTROL FUNCTION COMMANDS COMMAND LEVEL: BUS MASTER 1-Wire NET OTHER DEVICES DS1921G Figure 2. Hierarchical Structure for 1-Wire Protocol histogram memory; and 2048 bytes of data-logging memory. Except for the ROM and the scratchpad, all other memory is arranged in a single linear address space. All memory reserved for logging purposes, including counter registers and several other regis- ters, is read-only for the user. The timekeeping and control registers are write protected while the device is programmed for a mission. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one of the seven ROM function commands: Read ROM, Match ROM, Search ROM, Conditional Search ROM, Skip ROM, Overdrive-Skip ROM, or Overdrive-Match ROM. Upon completion of an Overdrive ROM com- mand byte executed at standard speed, the device enters overdrive mode, where all subsequent communi- cation occurs at a higher speed. The protocol required for these ROM function commands is described in Figure 13. After a ROM function command is success- fully executed, the memory functions become accessi- ble and the master can provide any one of the seven available commands. The protocol for these memory function commands is described in Figure 10. All data is read and written least significant bit first. Parasite Power Figure 1 shows the parasite-powered circuitry. This cir- cuitry “steals” power whenever the IO input is high. IO provides sufficient power as long as the specified tim- ing and voltage requirements are met. The advantages of parasite power are two-fold: 1) By parasiting off this input, battery power is not consumed for 1-Wire ROM function commands, and 2) if the battery is exhausted for any reason, the ROM may still be read normally. The remaining circuitry of the DS1921G is solely operated by battery energy. 64-Bit Lasered ROM Each DS1921G contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The next 48 bits are a unique serial number. The last 8 bits are a cyclic redundancy check (CRC) of the first 56 bits (see Figure 3 for details). The 1-Wire CRC is generated |
Similar Part No. - DS1921G-F5 |
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Similar Description - DS1921G-F5 |
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