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PCA9543APWG4 Datasheet(PDF) 5 Page - Texas Instruments |
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PCA9543APWG4 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 20 page  www.ti.com RESET Input Power-On Reset Voltage Translation 5.0 4.0 V (V) CC 3.0 2.0 1.0 5.0 5.5 2.0 2.5 3.0 3.5 4.0 4.5 Min Typ Max PCA9543A TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET SCPS169 – SEPTEMBER 2007 Table 2. Control Register Read (Interrupt)(1) D7 D6 INT1 INT0 D3 D2 B1 B0 COMMAND 0 No interrupt on channel 0 X X X X X X X 1 Interrupt on channel 0 0 No interrupt on channel 1 X X X X X X X 1 Interrupt on channel 1 0 0 0 0 0 0 0 0 No channel selected; power-up/reset default state (1) Two interrupts can be active at the same time. The RESET input can be used to recover the PCA9543A from a bus-fault condition. The registers and the I2C state machine within this device initialize to their default states if this signal is asserted low for a minimum of tWL. All channels also are deselected in this case. RESET must be connected to VCC through a pullup resistor. When power is applied to VCC, an internal power-on reset holds the PCA9543A in a reset condition until VCC has reached VPOR. At this point, the reset condition is released and the PCA9543A registers and I 2C state machine are initialized to their default states, all zeroes, causing all the channels to be deselected. Thereafter, VCC must be lowered below 0.2 V to reset the device. The pass-gate transistors of the PCA9543A are constructed such that the VCC voltage can be used to limit the maximum voltage that is passed from one I2C bus to another. Figure 4. Vpass Voltage vs VCC Figure 4 shows the voltage characteristics of the pass gate transistors (note that the graph was generated using the data specified in Electrical Characteristics section of this data sheet). In order for the PCA9543A to act as a voltage translator, the Vpass voltage should be equal to or lower than the lowest bus voltage. For example, if the main bus is running at 5 V and the downstream buses are 3.3 V and 2.7 V, Vpass must be equal to or below 2.7 V to effectively clamp the downstream bus voltages. As shown in Figure 4, Vpass(max) is at 2.7 V when the PCA9543A supply voltage is 3.5 V or lower, so the PCA9543A supply voltage could be set to 3.3 V. Pullup resistors then can be used to bring the bus voltages to their appropriate levels (see Figure 14). Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): PCA9543A |
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