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LTC4151CMS-PBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4151CMS-PBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page LTC4151/LTC4151-1 9 41511fa SCL SDA START CONDITION STOP CONDITION ADDRESS R/W ACK DATA ACK DATA ACK 1 - 7 8 9 41511 F02 a6 - a0 b7 - b0 b7 - b0 1 - 7 8 9 1 - 7 8 9 P S Figure 2. General Data Transfer over I2C I2C Interface The LTC4151/LTC4151-1 feature an I2C-compatible in- terface to provide access to six ADC data registers and a control register for monitoring the measured voltages. Figure 2 shows a general data transfer format using the I2C. The LTC4151 and LTC4151-1 are read-write slave devices and support SMBus Read Byte, Write Byte, Read Word and Write Word commands. The devices also sup- port Read Page and Write Page commands that allow one to read or write more than two bytes of data. When using the Read Page and Write Page commands, the host need only to issue an initial register address and the internal register address pointer automatically increments by 1 after each byte of data is read or written. After the register address reaches 06h, it will be reset to 00h and continue the increment. Upon a Stop condition, the register address is reset to 00h. If desired, the Read Page and Write Page support can be disabled by clearing control register bit G3. The data formats for the above commands are shown in Figures 3 to 8. APPLICATIONS INFORMATION Figure 3. LTC4151 Serial Bus SDA Write Byte Protocol Figure 4. LTC4151 Serial Bus SDA Write Word Protocol Figure 5. LTC4151 Serial Bus SDA Write Page Protocol S ADDRESS 1 1 0 a3:a0 FROM MASTER TO SLAVE FROM SLAVE TO MASTER A: ACKNOWLEDGE (LOW) A: NOT ACKNOWLEDGE (HIGH) R: READ BIT (HIGH) COMMAND DATA X X X X X b2:b0 0 W 00 0 b7:b0 A A AP 41511 F03 W: WRITE BIT (LOW) S: START CONDITION P: STOP CONDITION S ADDRESS 1 1 0 a3:a0 COMMAND DATA DATA X X X X X b2:b0 0 W 00 0 0 41511 F04 b7:b0 b7:b0 A A A AP S ADDRESS 1 1 0 a3:a0 COMMAND 0 X X X X X b2:b0 0 W 00 41511 F05 A A AP b7:b0 DATA 0 A b7:b0 DATA 0 A ... ... b7:b0 DATA Figure 6. LTC4151 Serial Bus SDA Read Byte Protocol S ADDRESS 1 1 0 a3:a0 1 1 0 a3:a0 1 0 COMMAND S ADDRESS R A b7:b0 1 DATA X X X X X b2:b0 0 W 00 41511 F06 A A A P Figure 7. LTC4151 Serial Bus SDA Read Word Protocol Figure 8. LTC4151 Serial Bus SDA Read Page Protocol S ADDRESS 1 1 0 a3:a0 1 1 0 a3:a0 1 0 COMMAND S ADDRESS R A b7:b0 1 DATA X X X X X b2:b0 0 W 00 41511 F07 A 0 A b7:b0 DATA A A P S ADDRESS 1 1 0 a3:a0 1 1 0 a3:a0 1 0 COMMAND S ADDRESS R A b7:b0 1 DATA X X X X X b2:b0 0 W 00 41511 F08 A 0 A b7:b0 DATA A A P ... ... b7:b0 DATA |
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