Teseo-LIV3R power sequencing?

[TimBrookline]

Hello,

I am curious whether there are any power sequencing requirements for the Teseo-LIV3R.  I didn't see any in the datasheet.  In particular:

• Will the module work correctly if VBAT is open-circuited, while VCC & VCCIO are supplied?  Obviously it won't retain time or ephemeris in this configuration, but will it even work at all?  Basically, is the internal 32k clock supplied by VCC OR VBAT, or only from VBAT?
• Would it cause any hardware problem to leave VCC up and VCCIO down for an indefinite period or time, or vice versa?
• What would the power draw be if, say, VCCIO was up but VCC was down?

Thanks!

[GalaxyQuest · Accepted solution]

Hi Tim,

Please see answers to your questions,

• You need VBAT at all times for module to work. Cannot leave VBAT open.
• Should not be a problem.
• You can leave VCCIO and VCC to OFF and keep VBAT ON. The power draw is 10 uA. It is not advised to keep Vcc = OFF and keep VCCIO = ON and vice versa.

Have you been working with our sales team or distributor on this project? 

Thanks,

George