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DS1921G Datasheet(PDF) 20 Page - Maxim Integrated Products |
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DS1921G Datasheet(HTML) 20 Page - Maxim Integrated Products |
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20 / 42 page  write command was not recognized by the device. If everything went correctly, both flags are cleared and the ending offset indicates the address of the last byte written to the scratchpad. Now the master can continue verifying every data bit. After the master has verified the data, it has to send the Copy Scratchpad command. This command must be followed exactly by the data of the three address registers TA1, TA2, and E/S as the master has read them verifying the scratchpad. As soon as the DS1921G has received these bytes, it copies the data to the requested location beginning at the target address. Memory/Control Function Commands The Memory/Control Function Flowchart (Figure 10) describes the protocols necessary for accessing the memory and the special function registers of the DS1921G. An example on how to use these and other functions to set up the DS1921G for a mission is includ- ed in the Mission Example: Prepare and Start a New Mission section. The communication between master and DS1921G takes place either at standard speed (default, OD = 0) or at overdrive speed (OD = 1). If not explicitly set into the overdrive mode, the DS1921G assumes standard speed. Internal memory access dur- ing a mission has priority over external access through the 1-Wire interface. This affects the read memory com- mands described below. See the Memory Access Conflicts section for details. Write Scratchpad [0Fh] After issuing the Write Scratchpad command, the mas- ter must first provide the 2-byte target address, fol- lowed by the data to be written to the scratchpad. The data is written to the scratchpad starting at the byte off- set T[4:0]. The ending offset E[4:0] is the byte offset at which the master stops writing data. Only full data bytes are accepted. If the last data byte is incomplete, its content is ignored and the partial byte flag (PF) is set. When executing the Write Scratchpad command, the CRC generator inside the DS1921G (see Figure 16) cal- culates a CRC of the entire data stream, starting at the command code and ending at the last data byte sent by the master. This CRC is generated using the CRC- 16 polynomial by first clearing the CRC generator and then shifting in the command code (0Fh) of the Write Scratchpad command, the target addresses TA1 and TA2 as supplied by the master, and all the data bytes. The master can end the Write Scratchpad command at any time. However, if the ending offset is 11111b, the master can send 16 read time slots and receive an inverted CRC-16 generated by the DS1921G. Note: The range 200h to 213h of the register page is protected during a mission. See Figure 6 for the access type of the individual registers between and during missions. Thermochron iButton 20 ______________________________________________________________________________________ BIT NUMBER 7 6 5 4 3 2 1 0 TARGET ADDRESS (TA1) T7 T6 T5 T4 T3 T2 T1 T0 TARGET ADDRESS (TA2) T15 T14 T13 T12 T11 T10 T9 T8 ENDING ADDRESS WITH DATA STATUS (E/S) (READ-ONLY) AA 0 PF E4 E3 E2 E1 E0 Figure 9. Address Registers |
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