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DS1921H Datasheet(PDF) 3 Page - Maxim Integrated Products |
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DS1921H Datasheet(HTML) 3 Page - Maxim Integrated Products |
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3 / 45 page  DS1921H/Z 3 of 45 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. DS1921H/Z BLOCK DIAGRAM Figure 1 Internal Timekeeping & Control Reg. & Counters 3V Lithium General-Purpose SRAM Register Page Alarm Time Stamp and Duration Logging Memory Datalog Memory Histogram Memory 32.768kHz Oscillator Control Logic Temperature Sensor 256-Bit Scratchpad Memory Function Control ROM Function Control 64-Bit Lasered ROM Parasite Powered Circuitry 1-Wire Port IO PARASITE POWER The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power whenever the IO input is high. IO will provide sufficient power as long as the specified timing 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 DS1921 is solely operated by battery energy. 64-BIT LASERED ROM Each DS1921 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family code. The next 36 bits are a unique serial number. The next 12 bits, called temperature range code, allow distinguishing the DS1921H and DS1921Z from each other and from other DS1921 versions. The last eight bits are a CRC of the first 56 bits. See Figure 3 for details. The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates as shown in Figure 4. The polynomial is X8 + X5 + X4 + 1. Additional information about the Maxim 1-Wire Cyclic Redundancy Check is available in Application Note 27. |
Similar Part No. - DS1921H_11 |
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Similar Description - DS1921H_11 |
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