Do the LSM303AGR CS lines have internal pull-downs?

[Milo Oien-Rochat]

Posted on October 10, 2017 at 21:50

1. Do CS_XL and CS_MAG have an internal pulldown so if they are left floating there are no issues?
2. Will it hurt the part if INT_1_XL and INT_2_XL are connected to 0V as long as we don�t try to use them?
   1. What happens if we do tell them to be used will this hurt the part?

 

#lsm303agr

[Miroslav BATEK · Accepted solution]

Posted on October 13, 2017 at 13:59

The default status of LSM303AGR pins is reported in Table 1 of the related app note (

http://www.st.com/content/ccc/resource/technical/document/application_note/group0/6d/cd/b8/e0/44/98/4e/81/DM00265383/files/DM00265383.pdf/jcr:content/translations/en.DM00265383.pdf

).

1. Both CS_XL and CS_MAG are ?input without pull-up? so they cannot be left floating, they have to be externally driven.

2. INT_1_XL and INT_2_XL are ?output forced to GND? if not used, so no problem to connect them to 0V as long as they are not used. In case they are used (while connected to 0V), every time they go to high level a short-circuit will happen and could damage the device (which in not intended to be used in this configuration).