[lm-sensors] TI TMP421 chip address

Andre Prendel andre.prendel at gmx.de
Wed May 27 11:15:14 CEST 2009

Hi Hans,

looking in the datasheet of the TMP421 sensor chip


I saw the following addresses.

TMP421  100 11xx
TMP422  100 11xx
TMP423A 100 1100
TMP423B 100 1101

But the preliminary driver of your students uses 0x2a.

 /* Addresses to scan */
 static unsigned short normal_i2c[] = { 0x2a, I2C_CLIENT_END };

0x2a == 010 1010b, right?

Do I misunderstand something?

And what means the xx in the address of TMP421/422?

Thanks in advance,

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