PCA9306DCTR

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1. Describe

The PCA9306DCTR device is a dual bidirectional I2C and SMBus voltage level shifter with enable (EN) function Input, can operate in the range of 1.2V to 3.3V VREF1 And 1.8V to 5.5V VREF2. PCA9306 device allows bidirectional voltage Conversion between 1.2 V and 5 V, no need to use Direction pin. Low on-resistance (RON) Switch allows connection Minimal propagation delay. When EN is high, The converter switch is turned on, SCL1 and SDA1 I/O is connected to SCL2 and SDA2 I/O, Allow bidirectional data flow separately port. When EN is low, the converter switch is closed, and There is a high impedance state between the ports. In addition to voltage conversion, PCA9306 devices Can be used to isolate 400 kHz bus from 100 kHz bus The bus disconnects the slower by controlling the EN pin Bus during fast mode communication.

2. Feature

    1. 2-bit bidirectional converter for SDA and SCL lines In mixed mode I2C applications

    2. I2C and SMBus compatible

    3. Maximum propagation delay less than 1.5 ns Adapt to standard mode and fast mode I2C Device and multiple controllers

    4. Allow voltage level conversion

        – 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V or 5-V VREF2

        – 1.8V VREF1 and 2.5V, 3.3V or 5V VREF2

        – 2.5V VREF1 and 3.3V or 5V VREF2

        – 3.3V VREF1 and 5V VREF2

    5. Provide bidirectional voltage conversion without direction pin

    6. Low 3.5Ω on-resistance between input and output ports provides less signal distortion

    7. Open-drain I2C I/O ports (SCL1, SDA1, SCL2 and SDA2)

    8. 5V fault-tolerant I2C I/O port, supporting mixed mode signal operation

    9. EN = low-level high-impedance SCL1, SDA1, SCL2, and SDA2 pins

  10. When EN = low, non-lockout operation for isolation

  11. Circulating lead wire, convenient for printed circuit board wiring and wiring

  12. Latch up performance exceeds 100 mA Per JESD 78, class II

  13. ESD protection exceeds JESD 22

        – 2000-V Human Body Model (A114-A)

        – 1000V charging equipment model (C101)

3. Application

    1. I2C, SMBus, PMBus, MDIO, UART, low speed Dual signal interfaces such as SDIO and GPIO

    2. Server

    3. Router (telecommunications switching equipment)

    4. personal computer

    5. automated industry

4. Pin configuration

5. Pin function

6. Function description

1. Enable (EN) pin

The PCA9306DCTR device is a double-pole single-throw switch in which the gate of the transistor is The voltage on the EN pin. When VREF2 is powered on, the PCA9306 device is always enabled. When the control signal from the processor is in a logic high state, the device is enabled.

2. Voltage conversion

The main feature of the PCA9306 device is to convert the voltage from an I2C bus referenced to VREF1 to an I2C bus referenced to VDPU. VREF2 is connected to this bus through a 200kΩ pull-up resistor. The translation can implement a standard open-drain I2C bus by simply connecting the pull-up resistors of SCL1 and SDA1 to VREF1 and connect the pull-up resistors from SCL2 and SDA2 to VDPU. Information about the size of the pull-up resistor can be found in the section Adjusting the pull-up resistor.

7. General Applications of I2C

As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the translator 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 controllers are possible. Under certain conditions, high termination currents can be used. When the SDA1 or SDA2 port is low, the clamp is in the ON state, and a low-resistance connection exists between the SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port when the SDA2 port is high, the voltage on the SDA1 port is limited to the voltage set by VREF1. When the SDA1 port is high, the SDA2 port is pulled to the pullup supply voltage of the drain (VDPU) by the pullup resistors. This functionality allows a seamless translation between higher and lower voltages selected by the user, without the need for directional control. The SCL1-SCL2 channel also functions in the same way as the SDA1-SDA2 channel.