The bitaxe w/ Test Socket

Inspired by the first fully open source hardware Bitcoin ASIC miner.
Here is the Test Socket version.

Goals

Automated Chip Tester: to verify the functionality of a chip for hashboard repairs.
Standalone: can mine directly to your pool over WiFi. No External computer needed.
Embedded: low cost, low maintenance, high availability, high reliability, low power.
ASIC: based on the very efficient BM1397 from Bitmain.
Versatile: solo/pool mining, autotune power/heat/efficiency.
Open Source: All design files are provided.

ESP32-S3-WROOM-1 wifi microcontroller on board
TI TPS40305 buck regulator steps down the 5V input to power the BM1397
Maxim DS4432U+ current DAC digitally adjusts the BM1397 core voltage from 0.04V to 2.4V
TI INA260 power meter measures the input voltage and current of the miner
Microchip EMC2101 measures the BM1397 internal diode temperature. Also PWM controls the fan and monitors tach output.
Two sweet RGB status LEDs

The BM1397 is a undocumented SHA256 mining ASIC from Bitmain. It's mostly used in the Antminer S17 and T17
Bitmain claims the BM1397 has 0.03J/GH efficiency
The BM1397 is available (new) for around $20 each and (used) for around $6 ea in small quantities.
Choose your BM1397 version: Guide here
The BM1397 has the same footprint as the BM1387, but a very different pinout.
- It also has two "Modes" that change some of the signal pins around to make chaining easy
The BM1397 is driven by an undocumented protocol over UART. Baudrate is 115200bps by default but can go up to 6Mbps in order to provide mining jobs quickly enough to the ASIC daisy-chain.

The hardware has been built and tested.
Using cgminer on a separate computer, the bitaxe can mine in excess of 400 GH/s (will need a 1.8V FT232 or FT230 USB UART adapter and modified cgminer)
ESP32 miner firmware is still underdevelopment.

BM1397 from random AliExpress seller. I got the "AG" variant. Not really sure what the difference is.
Heatsink - SEE BELOW
The BM1397 serial port is 1.8V. These pins are broken out, but the main idea is to communicate with the BM1397 from the ESP32
Level shifters to interface the 1.8V BM1397 with the 3.3V ESP32. These pins are also broken out.
KiCad 7 design files
Most of the parts on the board are listed in the KiCad BOM except the test socket

ASIC chip test base from Thanos Mining until another source is located. Note the pin alignments may be different from a different source.
A custom heatsink mod is required, see the Heatsink CAD for a model you can get CNC'd at PCB way < $40.

5VDC Power supply. Should be capable of over 15W
- Should connect with spade-style connectors

Pin Name	Description
+5V	Main input. This should be 5V, 15W
GND	Main input ground