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LTC2451CDDB-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC2451CDDB-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 18 page  LTC2451 10 2451ff The user can send one byte of data into the LTC2451 following a Write request and an ACK. The sequence is shown in Figure 3. The Write sequence is used solely to set the conversion speed. The default conversion speed is 60Hz. The user can specify a 30Hz conversion speed by setting the eighth bit (S30) = 1, or specify a 60Hz conversion speed by setting the eighth bit (S30) = 0. After a Read request and an ACK, the LTC2451 can output data, as shown in Figure 4. The data output stream is 16 bits long and is shifted out on the falling edges of SCL. The first bit is the MSB (D15) and is followed by successively less significant bits (D14, D13 ...) until the LSB (D0) is output by the LTC2451. This sequence is summarized in Figure 5. OPERATION SEQUENCE Continuous Read Conversions from the LTC2451 can be continuously read (see Figure 7). 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 LTC2451 generates a NAK signal indicating the conversion cycle is in progress. Figure 3. Timing Diagram for Write Sequence APPLICATIONS INFORMATION Figure 4. Timing Diagram for Read Sequence Figure 5. Conversion Sequence 1 789 2 3 14 S30 W SDA SCL 7-BIT ADDRESS START BY MASTER S30 = 1: 30Hz MODE S30 = 0: 60Hz MODE 56 7 8 9 ACK BY LTC2451 SLEEP DATA INPUT 2451 F03 ACK BY MASTER 17 8 9 2 3 18 D8 D13 D14 MSB D15 R SDA SCL 7-BIT ADDRESS START BY MASTER D7 D6 D5 D0 LSB 91 2 3 8 9 ACK BY LTC2451 ACK BY MASTER NACK BY MASTER SLEEP DATA OUTPUT CONVERT 2451 F04 SLEEP 7-BIT ADDRESS (0010100) SP R ACK READ DATA OUTPUT CONVERSION CONVERSION 2451 F05 |
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