I2C Information - MOXTEK X-ray Sources Operation Manual

Electrical Interface cont.
To interface with the Molex Picoblade connector, use a Molex 0510211200 connector housing and a Molex
28AWG jumper lead socket to socket wires. (Molex 0006660013 is a good example). Power on the cable should
be off when connecting or disconnecting to the source.

I2C Information

The master I2C bus requires 1K ohm to close to blue ribbon resistors for the pull-up voltage because of the nature of
the level shifter used.
Name
ctrl_Interlock
ctrl_Enable
errorFlags
ctrl_vHWREV
ctrl_vFWREV
ctrl_cMFGYEAR
ctrl_cMFGMONTH
ctrl_cMFGDAY
ctrl_cTUBESN
ctrl_cPSSN
ctrl_vBrdTemp
ctrl_vMaxTemp
ctrl_vMinTemp
ctrl_vHVSet
ctrl_vUASet
ctrl_vnegHVMon
ctrl_vUAMon
ctrl_vposHVMon
Reading and Writing Voltage/Current and/Temperature Values
To read or write to the registers, the code must read or write a byte at a time and convert them to their full values
(if they are larger than 1 byte). So for example, on ctrl_vBrdTemp, user would read the two bytes starting at 0x0F.
Because data is stored little-endian format, byte 0x10 is the most significant byte (MSB), so it is shifted up by 8
and added to byte 0x0F.
MOXTEK
®
Figure 3: Ribbon cable connection
Table 5: Addresses amd Lengths of Various Data
Type Size (bits)
unsigned 8
unsigned 8
unsigned 8
unsigned 8
unsigned 8
unsigned 8
unsigned 8
unsigned 8
unsigned 24
unsigned 24
unsigned 16
unsigned 16
unsigned 16
unsigned 16
unsigned 16
unsigned 16
unsigned 16
unsigned 16
X
Pin 1
Address (hex) Description
0x00 Status of pin 6 above, the enable signal
0x01 Enable status
0x02 All errors are registered here
0x03 hardware revision number
0x04 firmware revision number
0x06 manufactured year
0x07 manufactured month
0x08 manufactured day
0x09,0A,0B tube serial number
0x0C,0D,0E power supply serial number
0x0F,10 current board temperature
0x11,12 maximum recorded board temperature
0x13,14 minimum recorded board temperature
0x1B,1C high voltage set point
0x1D,1E beam current set point
0x1F,20 negative high voltage monitor
0x21,22 beam current monitor
0x23,24 positive high voltage monitor
4
TUB-MAN-1022 Rev A
Subject to technical change without notice