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PCA9517DGKRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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PCA9517DGKRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page SDAA SDAB SCL Rise time accelerator pulling SDAB high after SDAA overshoots past 500mV Not Recommended for New Designs PCA9517 SCPS157E – DECEMBER 2007 – REVISED JUNE 2014 www.ti.com 8.2 Feature Description 8.2.1 Clock Stretching Errata Description Due to the static offset on the B-side and the possibility of an overshoot above 500mV during events like clock stretching, the device should not be used with rise time accelerators on the B-side. Figure 5. Waveform of Clock Stretching with Rise Time Accelerator on the Bus System Impact An incorrect logic state will be transferred to circuits, creating an I2C communication failure on the bus. System Workaround Usage of the TCA9517 is recommended. There are two possible workarounds to avoid an I2C communication failure: • Removing rise-time accelerators from the B-side bus • Adding a larger capacitive load to the bus will limit the overshoot 8.2.2 Load Dependent Undershoot Errata Description There is a case in which a combination of weak pull-up resistance and light bus loading will cause communication failure through the bus due to undershoot. During a low-to-high transition, when the B-side releases from its 500mV VOL, an undershoot below VILC can occur. In this event, the A-side will recognize this as a valid low coming from the B-side, causing the A-side to be pulled down by the buffer. The A-side being improperly pulled down by the buffer will trigger the B-side to be pulled low. Since the B-side will be pulled to 500mV, this will not force the A-side to stay low. As the A-side begins transitioning high again, the issue will repeat itself. System Impact An incorrect logic state will be transferred to circuits, creating an I2C communication failure on the bus. System Workaround Usage of the TCA9517 is recommended. There are two possible workarounds to avoid an I2C communication failure: • Removing rise-time accelerators from the B-side bus • Adding a larger capacitive load to the bus will limit the overshoot 10 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated Product Folder Links: PCA9517 |
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