GTL2010PW-T 查看數據表（PDF） - Philips Electronics

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GTL2010PW-T

Bi-directional low voltage translators

Philips Electronics 

APPLICATIONS

Voltage Level Translation

Figure 17 shows an application similar to the one shown in Figure 2 but with only one ASIC I2C port that has to interface

with both the 3.3 V and 5 V I2C devices. Since the voltage difference between the low voltage (1.5V, left side) and the

voltage on the resistor for the GREF (Gate pull-up) is higher than 1.5V, the resistors R30 and R25 are not required unless

the devices on MI2C_CLK are leaky.

Note: Pull up resistors on the low voltage side are required if the difference between the voltage applied on the

Gate reference (GREF) pull up resistor and the low side voltage is lower than 1.5 V.

Figure 17. Example of 1.5 V I2C Bus to both 3.3V SMBus and 5.0 V I2C Bus

Note: Figure 2 and Figure 17 are from the Intel reference design. Resistor sizing works fine but is not in accordance with

the recommendations in this application note.

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