TCA9517-Q1: Experts, please recommend a 3.3V to 5V level shifter & buffer if required

Andre Murray

Part Number: TCA9517-Q1
Other Parts Discussed in Thread: INA228, LSF0102-Q1, TCA9517, LSF0102

Hi experts,

We have an automotive application where the I2C master and RTC are running on 3.3V logic and an EEPROM, INA228AQDGSRQ1 and LCD interface are running on 5V logic. We considered using TXS0104EQPWRQ1, but I read a post on this forum that trace length is an issue for the TXS0104EQPWRQ1? The approx. trace lengths are below, I'm not sure how I upload image.

EEPROM > I2C connector for LCD interface (20mm across) > INA228 (25mm across, plus 20mm down on stub > level shifter IC (12mm across) > I2C master (25mm across) > RTC IC (20mm across)

Although this is automotive application, it is not used for anything life critical so we could look at none-automotive part if the feature set is better. Operating temp will be less than 85C. Anti-lock up would be nice.

The LCD I2C controller includes a 10K pull-up, which we have no control over.

Regards

Anders

12 months ago

0 Clemens Ladisch 12 months ago

Guru 268180 points

12 cm should be OK.

The TXS has edge accelerators to allow higher data rates. This is not necessary for I²C.

You could also use the LSF0102-Q1.

0 BOBBY 11 months ago

TI__Guru 56180 points

Hi Anders,

The lengths you're describing aren't too long that I would be too concerned about capacitance loading. If you did want to split the bus load you could use a device like TCA9517/TCA9617 to redrive the signal.

As Clemen's pointed out, the LSF0102 could also be something you can consider if you don't need an I2C redriver and just need level shifting only.

Let me know if you have any other follow up questions or concerns.

-Bobby

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TCA9517-Q1: Experts, please recommend a 3.3V to 5V level shifter & buffer if required