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Re: [Paparazzi-devel] i2c voltage level

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] i2c voltage level
Date: Mon, 19 Aug 2013 17:00:16 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

if you supply the imu with 3.3V it works with 3V i2c.
If you supply it with 5V it works with 5V i2c.
But you may destroy the 3V i2c components if you connect them with 5V i2c.
The lpc2148 is 5V compatible if it is supplied with 3.3V.
If you power on the i2c brush less controller (5V)  and the lpc2148 has no power you will destroy the LPC2148.
The stm32 pins are only 5V compatible if the processor is supplied.
The maximum level is 4V if there is no power on the processor.

Refik Sever schrieb:
Dear all,

We have bought Drotek 10dof IMU, and the module works with 5V.  Do the I2C pins of drotek also work with 5V?

Are the I2C pins of LPC2148 and STM32 processors compatible with 5V?


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