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Need level shifter for LSM303AH

rimbaud
Associate II

Hello,

I am work with LSM303AH which working normally with 1.8 v.

My MCU works and provide 3.3v only.

I am looking for level shifter 3.3v to 1.8 v and vice-versa, for powering, I2C communication and logic high conversion.

Do you have any device to suggest ?

regards

10 REPLIES 10
Uwe Bonnes
Principal II

PCA9306 ,TCA9506?

rimbaud
Associate II

Thank you ,PCA9306 seems be good deal.

But how i can shift high and low level of INT_MAG/DRDY (high level 1.8 v -> 3.3v )?

regards,

Uwe Bonnes
Principal II

SN74LVC1T45? Or with INT_MAP pulled to 1.8V with a resistor and driving the base of an NPN

rimbaud
Associate II

Can you suggest me a resistance value please for the base (for 1.8 v) ?

regards,

rimbaud
Associate II

Do you suggest me BCP56-16 transistor ?

regards,

Uwe Bonnes
Principal II

BCP56-16 seems oversized. If you have problems with dimensioning an transistor inverter, either read some books (AOE, Tietze Schenk) to learn the basics or stay with the 74T45.

rimbaud
Associate II

Thank you for for suggestions.

What do you think about this device BOB-11771 ?

With 4*4 input*output, i can shift the SCL and SDA an other pins.

regards,

Uwe Bonnes
Principal II

 AUTO-DIRECTION SENSING devices are sensible parts. Reflection on open wires can upset them. It may work, if you know what you are doing and do things in s sensible way, but expect problems in corner cases. Dedicated I2C level shifts will work in a wider range of setups.

Uwe Bonnes
Principal II

As some user stated: "whereas for open-drain signals such as I2C, the BOB-12009 is a better option"