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LTC2495 Datasheet(PDF) 21 Page - Linear Technology |
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LTC2495 Datasheet(HTML) 21 Page - Linear Technology |
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21 / 32 page  LTC2495 21 2495f Figure 6. Conversion Sequence Figure 7. Consecutive Reading with the Same Input/Configuration Table 6. Address Assignment CA2 CA1 CA0 ADDRESS LOW LOW LOW 0010100 LOW LOW HIGH 0010110 LOW LOW FLOAT 0010101 LOW HIGH LOW 0100110 LOW HIGH HIGH 0110100 LOW HIGH FLOAT 0100111 LOW FLOAT LOW 0010111 LOW FLOAT HIGH 0100101 LOW FLOAT FLOAT 0100100 HIGH LOW LOW 1010110 HIGH LOW HIGH 1100100 HIGH LOW FLOAT 1010111 HIGH HIGH LOW 1110100 HIGH HIGH HIGH 1110110 HIGH HIGH FLOAT 1110101 HIGH FLOAT LOW 1100101 HIGH FLOAT HIGH 1100111 HIGH FLOAT FLOAT 1100110 FLOAT LOW LOW 0110101 FLOAT LOW HIGH 0110111 FLOAT LOW FLOAT 0110110 FLOAT HIGH LOW 1000111 FLOAT HIGH HIGH 1010101 FLOAT HIGH FLOAT 1010100 FLOAT FLOAT LOW 1000100 FLOAT FLOAT HIGH 1000110 FLOAT FLOAT FLOAT 1000101 APPLICATIONS INFORMATION unchanged from the last value written into the device. If the device has not been written to since power up, the configuration is set to the default value. At the end of a read operation, a new conversion automatically begins. At the conclusion of the conversion cycle, the next result may be read using the method described above. If the conversion cycle is not concluded and a valid address selects the device, the LTC2495 generates a NAK signal indicating the conversion cycle is in progress. Continuous Read/Write Once the conversion cycle is concluded, the LTC2495 can be written to and then read from using the Repeated Start (Sr) command. Figure 8 shows a cycle which begins with a data Write, a repeated Start, followed by a Read and concluded with a Stop command. The following conversion begins after all 24 bits are read out of the device or after a Stop command. The following conversion will be performed using the newly programmed data. In cases where the same speed (1x/2x mode), rejection frequency (50Hz, 60Hz, 50Hz and 60Hz) and gain is used but the channel is changed, a Stop or Repeated Start may be issued after the first byte (channel selection data) is written into the device. Discarding a Conversion Result and Initiating a New Conversion with Optional Write At the conclusion of a conversion cycle, a write cycle can be initiated. Once the write cycle is acknowledged, a Stop command will start a new conversion. If a new input S ACK DATA Sr DATA TRANSFERRING P SLEEP DATA INPUT/OUTPUT CONVERSION CONVERSION 7-BIT ADDRESS R/W 2495 F05 7-BIT ADDRESS CONVERSION CONVERSION CONVERSION SLEEP SLEEP DATA OUTPUT DATA OUTPUT 7-BIT ADDRESS SS RR ACK ACK READ READ PP 2495 F07 |
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