Antminer U3 User manual

AntMiner U3 User Guide
Last updated: 1/17/2015
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BITMAIN
AntMiner-U3 User Guide

AntMiner U3 User Guide
Last updated: 1/17/2015
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Contents
1. The First Glance ..............................................................................................................3
2. Accessories and Connection .........................................................................................3
3. Install Driver ....................................................................................................................4
4. Core Voltage & Operating Frequency Adjustments .................................................9

AntMiner U3 User Guide
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1. The First Glance
AntMiner U3 is the third generation of USB miner. The U3 utilizes 4 of
BITMAIN’s latest generation BM 1382 chips in high quality, domed case. Setup
consists of plugging in the USB and power cables and running Antminer
CGMiner.
2. Accessories and Connection
2.1 Accessories
The accessories of AntMiner U3 including:
12V AC/DC power brick of 6A, but AC power line not included * 1
USB connection cable * 1
2.2 Connection
a) Plug one side of 12V AC/DC power brick into U3, and plug the other
side into AC input.
b) Connect U3 and the computer via the USB line.
Noted:
Connection order must be “a)”first, and then “b)”. Order cannot be

AntMiner U3 User Guide
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reversed.
To prevent the interruption of USB power supply, please ensure the
computer is not in standby or sleep mode. Otherwise, the cgminer wouldn’t find
the miner even make it ZOMBIE.
3. Install Driver
Cgminer for antminer-U3:
https://www.bitmaintech.com/Support/Antminer
USB/Cgminer/cgminer-run-windows-20150107.rar
Open sourced code of Cgminer for antminer-U3:
https://github.com/bitmaintech/cgminer
CP2102 Driver:
http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers
.aspx
zadig:
http://zadig.akeo.ie/
1> Install CP210x_VCP driver.
2> Plug in Antminer-U3.
3> Open Zadig and click “Options -> List All Devices”

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4> Select CP2102 USB to UART Bridge Controller, and then click “Replace
Driver”
XP:
a. Install CP210x_VCP driver.

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b. zadig
c.
WIN 7:
a. Install CP210x_VCP driver.

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b. zadig

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c.
Win 8:
a. Install CP210x_VCP driver

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b. zadig
c.
5> Run cgminer following the below:
cgminer.exe --bmsc-options 115200:0.54 –o 50.31.149.57:3333 -u
antminer -p 123 --bmsc-voltage 0830 --bmsc-freq 0982 --startdiff 6
some pools: p2p.antpool.com:25; solo.antpool.com:3333

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Noted:
a) Please note that “115200” stands for the “Baud Rate”, and “0.65”
means “timeout”.It changes with Freq you set to guarantee the speed.
Details see chart 2.
b) ‘--startdiff 6’ is to make the low hash rate miners getting a proper
difficulty asap, which is still under developing by Antpool
c) Core Voltage can be changed by setting the figure “0830”
Operating frequency can be changed by setting the figure “0982”
4. Core voltage & Operating Frequency Adjustments
Core voltage and operating frequency can be adjusted by software.
1> Core Voltage can be changed by setting the figure “0800”.
The voltage varieties from 0.725 to 0.85v, 0.75v by default, and min unit is
0.005v.Higher voltage supports higher Freq. As 0.75v,U3 can work not
more than 225M.
Please refer below chart:
Insert Value
Voltage（V）
0725
0.725
0730
0.730
0735
0.735
0740
0.740
0745
0.745
0750
0.750
0755
0.755
0760
0.760
0765
0.765
0770
0.770
0775
0.775
0780
0.780
0785
0.785
0790
0.790
0795
0.795

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0800
0.800
0805
0.805
0810
0.810
0815
0.815
0820
0.820
0825
0.825
0830
0.830
0835
0.835
0840
0.840
0845
0.845
0850
0.850
Chart 1
2> Operating frequency can be changed by setting the figure “0882”. Please
refer below chart:
Eg. –bms-coptions 115200:0.57 --bmsc-freq 1286
Insert Value
Frequency（M）
Prefer timeout
(100 ms)
0783
100.00
1.36
0983
125.00
1.09
0B83
150.00
0.91
0D83
175.00
0.78
0F03
193.75
0.71
1F07
196.88
0.69
0782
200.00
0.68
1006
206.25
0.66
1086
212.50
0.64
1106
218.75
0.62
0882
225.00
0.61
1286
237.50
0.57
1306
243.75
0.55

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0982
250.00
0.54
Chart 2