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DS1921H Datasheet(PDF) 25 Page - Maxim Integrated Products |
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DS1921H Datasheet(HTML) 25 Page - Maxim Integrated Products |
25 / 45 page DS1921H/Z 25 of 45 HARDWARE CONFIGURATION Figure 12 Open Drain Port Pin RX = RECEIVE TX = TRANSMIT 100Ω MOSFET VPUP RX TX TX RX DATA 5µA Typ. BUS MASTER DS1921 1-Wire PORT RPUP TRANSACTION SEQUENCE The protocol for accessing the DS1921H/Z via the 1-Wire port is as follows: Initialization ROM Function Command Memory/Control Function Command Transaction/Data INITIALIZATION All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the slave(s).The presence pulse lets the bus master know that the DS1921H/Z is on the bus and is ready to operate. For more details, see the 1-Wire Signaling section. ROM FUNCTION COMMANDS Once the bus master has detected a presence, it can issue one of the seven ROM function commands. All ROM function commands are eight bits long. A list of these commands follows (refer to flowchart in Figure 13). Read ROM [33h] This command allows the bus master to read the DS1921H/Z’s 8-bit family code, temperature range code, plus unique 36-bit serial number and 8-bit CRC. This command can only be used if there is a single slave on the bus. If more than one slave is present on the bus, a data collision will occur when all slaves try to transmit at the same time (open drain will produce a wired-AND result). The resultant family code and temperature range code plus 36-bit serial number will result in a mismatch of the CRC. Match ROM [55h] The Match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address a specific DS1921H/Z on a multidrop bus. Only the DS1921H/Z that exactly matches the 64-bit ROM sequence will respond to the following memory function command. All other slaves will wait for a reset pulse. This command can be used with a single or multiple devices on the bus. |
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