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LTC4151IDD-1-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4151IDD-1-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC4151/LTC4151-1 10 41511fa Using Optoisolators with LTC4151-1 The LTC4151-1 splits the SDA line into SDAI (input) and SDAO (inverted output) for convenience of opto- coupling with a host controller that sits at a differ- ent ground level. When using optoisolators with the LTC4151-1, connect the SDAI to the output of the incoming optocoupler and connect the SDAO to the anode of the outgoing optocoupler (see Figure 9). With the outgoing optocoupler clamping SDAO and internal 6V (5.5V minimum) clamps on SDAI and SCL, the pull-up resistors on these three pins can be directly connected to VIN. In this way (with SDAO rather than conventional SDAO), the need for a separate low voltage supply for pull-ups is eliminated. Start and Stop Conditions When the I2C bus is idle, both SCL and SDA must remain in the high state. A bus master signals the beginning of a transmission with a Start condition by transitioning SDA from high to low while SCL stays high. When the master has finished communicating with the slave, it issues a Stop condition by transitioning SDA from low to high while SCL stays high. The bus is then free for another transmission. Stuck-Bus Reset The LTC4151/LTC4151-1 I2C interface features a stuck- bus reset timer. The low conditions of the SCL and the SDA/SDAI pins are OR’ed to start the timer. The timer is reset when both SCL and SDA/SDAI are pulled high. If the SCL pin or the SDA/SDAI pin is held low for over 33ms, the stuck-bus timer will expire and the internal I2C state machine will be reset to allow normal communication after the stuck-bus condition is cleared. The stuck-bus timer can be disabled by clearing control register bit G2. I2C Device Addressing Nine distinct I2C bus addresses are configurable us- ing the three-state pins ADR0 and ADR1, as shown in Table 1. Address bits a6, a5 and a4 are configured to (110) and the least significant bit is the R/W bit. In addi- tion, the LTC4151 and LTC4151-1 will respond to a mass write address (1100 110)b for writing to all LTC4151s and LTC4151-1s, regardless of their individual address settings. APPLICATIONS INFORMATION Figure 9. Optoisolation of the I2C Interface Between LTC4151-1 and a Microcontroller 41511 F09 3.3V RS 0.02Ω μ-Controller LTC4151-1 SCL SCL VIN 48V VIN VDD VADIN 2 3 4 SDAI ADIN ADR1 R5 0.51k R6 10k R7 10k R4 0.51k R1 20k R2 20k R3 5.1k 1 8 2 7 3 6 4 5 8 1 7 2 6 3 5 4 6 110 7 8 5 9 SDA ADR0 GND SENSE+ SENSE– SDA0 MOCD207M MOCD207M |
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