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LTC4316 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4316 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 14 page  LTC4316 7 4316f For more information www.linear.com/LTC4316 operaTion SDAOUT pin. Once all 7 bits of the address are processed, the LTC4316 turns on N2 again to reconnect SDAIN to SDAOUT. The master then transmits the R/W bit directly to the slave. If the new, translated address on SDAOUT matches the slave’s address, the slave pulls SDAOUT low to acknowledge (ACK bit). N2 remains on and the rest of the data bytes are transmitted unmodified between the masterandslave.Theaddresstranslationprocessrestarts when the master issues a new START bit. Figure 2 shows typical waveforms for the circuit on the front page. In this example, the master transmits address 0x34 while the slave is configured to respond to address 0x36.TheresistivedividersattheXORLandXORHpinsare configuredtogenerateanaddresstranslationbyteof0x02. Note that in this example, the 8-bit hexadecimal address format (with R/W=0) is used. 7-bit addresses are also commonly found in I2C device documentation. Make sure to use the correct format when calculating the address translation byte. Table 1 shows examples of both formats. Figure 1. Basic Functions of the LTC4316 4316 F01 VCC1 MASTER SCLOUT SDAOUT SCLIN SDAIN VCC2 SLAVE #1 LTC4316 SLAVE #2 7-BIT ADDRESS TRANSLATION BYTE SHIFT REGISTER 0000010 ENABLE ADDRESS TRANSLATION N3 1.8V CMP2 – + XOR N1 N2 Figure 1 shows an I2C master connected to the input bus of the LTC4316 (SCLIN and SDAIN). The slave devices requiring address translation are connected to the output bus of the LTC4316 (SCLOUT and SDAOUT). Any other slave devices that do not require address translation are placed together with the master on the input bus of the LTC4316. Two switches (N1 and N2) inside the LTC4316 connect the input bus to the output bus. N1 connects SCLIN to SCLOUT while N2 connects SDAIN to SDAOUT. In most conditions, N1 and N2 stay on so that the input and output buses are connected. Translation starts when the master issues a START bit (SDAIN goes low while SCLIN is high). The LTC4316 turns off N2 to disconnect SDAIN from SDAOUT. As the master sends the address byte, the LTC4316 translates the incoming address at the SDAIN pin to a new address at the SDAOUT pin by XORing each incoming bit with a user-configurable translation byte, one bit at a time. N3 turns on and off to send out the new address to the Figure 2. Basic Address Translation Waveforms TRANSLATION BYTE SDAOUT SCLIN SDAIN ADDRESS BITS START a6 a5 a4 a3 a2 a1 a0 0 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 1 0 1 1 0 = 0x34 = 0x02 = 0x36 4316 F02 N2 GATE N2 ON N2 ON N2 OFF R/W BIT ACK BIT |
Similar Part No. - LTC4316_15 |
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Similar Description - LTC4316_15 |
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