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PCA9518PWR Datasheet(PDF) 11 Page - Texas Instruments |
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PCA9518PWR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 20 page www.ti.com VOL OF PCA9518 VOL EXPSDA1 EXPSDA2 EXPSCL1 EXPSCL2 BUS n with n > 1 BUS 0 EXPANSION BUS BUS 1 9th Clock Cycle 9th Clock Cycle tst tER1 tr2 tf2 tf1 tr1 VOL of Master VOL of PCA9518 SCL of Master SDA of Master SCL of Slave SDA of Slave tPLH of Slave tPLH PCA9518 EXPANDABLE FIVE-CHANNEL I2C HUB SCPS132A – JUNE 2006 – REVISED JULY 2007 APPLICATION INFORMATION (continued) If the bus master in Figure 3 were to write to the slave through the PCA9518, the waveform shown in Figure 4 would be created. Figure 4. Bus Waveforms Note that any arbitration or clock-stretching events on bus 1 require that the VOL of the devices on bus 1 be 70 mV below the VOL of the PCA9518 (see VOL – VILc in electrical characteristics) to be recognized by the PCA9518 and transmitted to bus 0. This looks like a normal I2C transmission, except for the small step preceding each clock low-to-high transition and proceeding each data low-to-high transition for the master. The step height is the difference between the low level driven by the master and the higher-voltage low level driven by the PCA9518 repeater. Its width corresponds to an effective clock stretching coming from the PCA9518, which delays the rising edge of the clock. That same magnitude of delay is seen on the rising edge of the data. The step on the rising edge of the data is extended through the ninth clock pulse as the PCA9518 repeats the acknowledge from the slave to the master. The clock of the slave looks normal, except that the VOL is the 0.5-V level generated by the PCA9518. The SDA at the slave has a particularly interesting shape during the ninth clock cycle, when the slave pulls the line below the value driven by the PCA9518 during the ACK and then returns to the PCA9518 level, creating a foot before it completes the low-to-high transition. SDA lines, other than the one with the master and the one with the slave, have a uniform low level driven by the PCA9518 repeater. 11 Submit Documentation Feedback |
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