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PCA9306DCTR Datasheet(PDF) 7 Page - Texas Instruments |
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PCA9306DCTR Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 16 page  APPLICATION INFORMATION General Applications of I 2C 1 2 3 4 5 6 7 8 SW SW V = 1.8 V REF1 V = 3.3 V DPU I C Bus Master 2 I C Bus Device 2 V REF1 V REF2 EN V CC V CC PCA9306 GND GND GND SDA SDA1 SDA2 200 kΩ SCL1 SCL SCL SDA SCL2 R PU R PU R PU R PU PCA9306 www.ti.com....................................................................................................................................................... SCPS113I – OCTOBER 2004 – REVISED JULY 2008 In I2C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9306 enables the system designer to isolate two halves of a bus; thus, more I2C devices or longer trace length can be accommodated. The PCA9306 also can be used to run two buses, one at 400-kHz operating frequency and the other at 100-kHz operating frequency. If the two buses are operating at different frequencies, the 100-kHz bus must be isolated when the 400-kHz operation of the other bus is required. If the master is running at 400 kHz, the maximum system operating frequency may be less than 400 kHz because of the delays added by the repeater. As with the standard I2C system, pullup resistors are required to provide the logic high levels on the translator's bus. The PCA9306 has a standard open-collector configuration of the I2C bus. The size of these pullup resistors depends on the system, but each side of the repeater must have a pullup resistor. The device is designed to work with standard-mode and fast-mode I2C devices, in addition to SMBus devices. Standard-mode I2C devices only specify 3 mA in a generic I2C system where standard-mode devices and multiple masters are possible. Under certain conditions, high termination currents can be used. Figure 2. Typical Application Circuit (Switch Always Enabled) Copyright © 2004–2008, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): PCA9306 |
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