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PCA9549 Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9549 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 24 page PCA9549_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 11 July 2006 7 of 24 Philips Semiconductors PCA9549 Octal bus switch with individually I2C-bus controlled enables Figure 7 shows the voltage characteristics of the pass gate transistors (note that the PCA9549 is only tested at the points specified in Section 9 “Static characteristics”). In order for the PCA9549 to act as a voltage translator, the Vo(sw) voltage should be equal to, or lower than the lowest bus voltage. For example, if the main bus was running at 5 V, and the downstream buses were 3.3 V and 2.7 V, then Vo(sw) should be equal to or below 2.7 V to effectively clamp the downstream bus voltages. Looking at Figure 7, we see that Vo(sw) (maximum) will be at 2.7 V when the PCA9549 supply voltage is 3.5 V or lower so the PCA9549 supply voltage could be set to 3.3 V. Pull-up resistors can then be used to bring the bus voltages to their appropriate levels (see Figure 16). (1) maximum (2) typical (3) minimum Fig 7. Vo(sw) voltage versus VDD VDD (V) 2.0 5.5 4.5 3.0 4.0 002aaa964 3.0 2.0 4.0 5.0 Vo(sw) (V) 1.0 3.5 5.0 2.5 (1) (2) (3) |
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