Vout > on-board power supply

General
1

I’m trying to use a bus pirate 5 I bought a while back as a SPI flash programmer. I seem to be failing at the first hurdle because when I turn on Vout I’m told that I have an external voltage connected

SPI> W 3.3
3.30V requested, closest value: 3.30V
Current limit:Disabled

Power supply:Enabled

Error: Vout > on-board power supply. Backflow prevention activated
        Is an external voltage connected to Vout/Vref pin?

I saw the post about the batch 1 issues REV10 batch 1 errors, fixes, replacements I’m not sure if I have one of those or not and I’m not sure if that impacts using Vout

Bus Pirate 5 REV10
Firmware main branch (2024-08-05T11:03:16Z)
RP2040 with 264KB RAM, 128Mbit FLASH
S/N: 32250A0B33CC62E4
https://BusPirate.com/
Storage:   0.10GB (FAT16 File System)

Configuration file: Loaded
Available modes: HiZ 1-WIRE UART HDUART I2C SPI 2WIRE DIO LED
Active mode: spi (baudrate, clock polarity, clock phase, cs)=(61kHz, 1, 1, 2)
Display format: Auto
Data format: 8 bits, MSB bitorder
Pull-up resistors: OFF
Power supply: OFF
Frequency generators: OFF
2 Likes
2

I have one of the early rev10 boards. I made one of the two suggested mods.

Please take no offense, but just to make sure - when you enter SPI mode, what does the display show on the SPI pins? They should all be zero.

2 Likes
3

They all say 0 (at this point there’s nothing connected to any of the pins).

1.Vout  2.IO0   3.IO1   4.IO2   5.IO3   6.IO4   7.IO5   8.IO6   9.IO7   10.GND  
OFF     -       -       -       -       MISO    CS      CLK     MOSI    GND     
0.0V    0.0V    0.0V    0.0V    0.0V    0.0V    0.0V    0.0V    0.0V    GND

The silkscreen on the PCB says Nov 2023 which I guess could be one of the early batches. There’s no obvious rework on the board.

4

I have no idea if the serial numbers are ascending in order. FWIW, the serial number of mine (Bus Pirate 5 Preview Version, assembled PCB only, ordered Oct 25, 2023, for $27.85) is 32104F0B33CC62E4

Do you have a record when you ordered your BP? The introductory price of the was purposely kept low.

5

Going on my old emails. It was shipped on 22nd Jan 2024

6

Hey @cpackham!

I think it is highly likely that is from the first batch and needs a hardware fix. There’s some examples around of how to fix it.

The only absolutely necessary step is to short two pins on U506 (?), which is pretty do-able for a short term fix.

Please open a support ticket and we will send a replacement. China just started the National holiday though, so you probably won’t get a reply until next week.

1 Like
7

Great thanks for that. I’ve clicked the support link on the order page on dirtypcbs.com

I’ll attempt the U506 rework on the board I have.

1 Like
8

Thanks so much for understanding! Let us know how the fix turns out. Well get you a replacement asap.

9

I managed to get the rework done. Seems to have got me past the Vout issue I was having. Now I can play with a few different SPI-NOR chips.

2 Likes
10

Congratulations! Nice work, and thank you for the update. Let us know how it goes.

11

Just received my replacement BP5 and it works great. Thanks for all your help.

2 Likes
12

Thanks for the update, I’m.glad it arrived!