I²C (Mk II)

On-board I²C slaves

The USB armory Mk II has the following components accessible as I²C slaves:

Models	Address	P/N	Role	Max I²C frequency
all	0x08	NXP F1510	Power management controller	400 kHz
rev. γ	0x48	NXP SE050	Cryptographic co-processor	1.7 MHz
rev. β	0x48	NXP A71CH	Cryptographic co-processor	400 kHz
rev. β	0x60	Microchip ATECC608A	Cryptographic co-processor	1 MHz
all	0x61	Texas Instruments TUSB320	Type-C plug port controller	400 kHz
all	0x31	ON Semiconductor FUSB303	Type-C receptacle port controller	400 kHz

Control tool

The USB armory Mk II I²C slaves can be queried/controlled using armoryctl.

Manual access

The following example shows how to perform detection of on-board slaves on a Debian installation running on the USB armory Mk II:

apt-get install i2c-tools
modprobe i2c-dev
i2cdetect 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n] Y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- 08 -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- 31 -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 61 -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

The following example shows how to read the DEVICE ID register of the FUSB303 Type-C receptacle port controller:

i2cget -y 0 0x31 0x01
0x10

External I²C slaves

Using the debug accessory external I²C slaves can be accessed.