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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD5337ARM датащи(PDF) 18 Page - Analog Devices |
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AD5337ARM датащи(HTML) 18 Page - Analog Devices |
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18 / 24 page  AD5337/AD5338/AD5339 Rev. A | Page 18 of 24 READ OPERATION When reading data back from the AD5337/AD5338/AD5339 DACs, the user begins with an address byte (R/W = 0), after which the DAC acknowledges that it is prepared to receive data by pulling SDA low. This address byte is usually followed by the pointer byte, which is also acknowledged by the DAC. Then the master initiates another start condition (repeated start) and the address is resent with R/W = 1. This is acknowledged by the DAC indicating that it is prepared to transmit data. Two bytes of data are then read from the DAC as shown in Figure 34. A stop condition follows. Note that in a read sequence, data bytes are the same as those in the write sequence except that don’t cares are read back as 0. However, if the master sends an ACK and continues clocking SCL (no stop is sent), the DAC retransmits the same two bytes of data on SDA. This allows continuous read back of data from the selected DAC register. Alternatively, the user may send a start followed by the address with R/W = 1. In this case, the previously loaded pointer settings are used and read back of data can begin immediately. DATA BYTE LEAST SIGNIFICANT DATA BYTE 00 0 1 1 A0 R/W X X LSB ACK BY AD533x SCL SDA START CONDITION BY MASTER ACK BY AD533x MSB SCL SDA 00 0 1 1 0 A0 R/W MSB REPEATED START CONDITION BY MASTER ACK BY AD533x ADDRESS BYTE SCL SDA MSB LSB NO ACK BY MASTER STOP CONDITION BY MASTER POINTER BYTE ADDRESS BYTE 0 ACK BY MASTER LSB Figure 34. Read Sequence |
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