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Topic: Analog Pin Test Failure (Low voltage) (Read 52 times) previous topic - next topic

Analog Pin Test Failure (Low voltage)

I did the wiring:


I ran the check. Results of self-test is as follows:
Code: [Select]
Bus Pirate v3b
Firmware v5.10 (r559)  Bootloader v4.4
DEVID:0x0447 REVID:0x3046 (24FJ64GA002 B8)
http://dangerousprototypes.com
HiZ>~
Disconnect any devices
Connect (Vpu to +5V) and (ADC to +3.3V)
Space to continue
Ctrl
AUX OK
MODE LED OK
PULLUP H OK
PULLUP L OK
VREG OK
ADC and supply
5V(4.33) FAIL
VPU(4.34) FAIL
3.3V(3.30) OK
ADC(3.30) OK
Bus high
MOSI OK
CLK OK
MISO OK
CS OK
Bus Hi-Z 0
MOSI OK
CLK OK
MISO OK
CS OK
Bus Hi-Z 1
MOSI OK
CLK OK
MISO OK
CS OK
MODE and VREG LEDs should be on!
Any key to exit
Found 2 errors.
HiZ>

The analog pin test fails, with the voltages being a bit low. I thought to try a smaller jumper but the voltage still comes in too low. It was working well before, I wonder what I need to do next to debug?

So when I go to just try out a simple I2C pull-up setup, the device apparently fails! I wonder if I killed it somehow when I started using it after a few months...

Attached log of that below:
Code: [Select]
(1)>4
Set speed:
 1. ~5KHz
 2. ~50KHz
 3. ~100KHz
 4. ~400KHz

(1)>1
Ready
I2C>P
Pull-up resistors ON
Warning: no voltage on Vpullup pin
I2C>W
VREG too low, is there a short?
Power supplies OFF
I2C>

Harumph!

 

Re: Analog Pin Test Failure (Low voltage)

Reply #1
Hmmm.... I may have solved this on my own. It seems that this USB bay, even when plugged in, can't actually keep the 5V rail up. Attach the thing to my laptop and the error goes away!