Maxim Integrated 6613_PSU_1+1S_URT_v1_00 - Manual (Page 13)

UG_6613_ 040 6613_PSU_1+1S_URT_V1_00 Firmware Description Document
Rev. 1.0 13
6.5 Calibration Commands
Using the precision source method, the user provides a precision voltage and precision current load to
the device for calibration. The 6613_PSU_1+1S_URT_v1_00 firmware provides commands to calibrate
the measurement units. For linear current sensors, such as current shunt, no phase calibration is
necessary.
There are two types of calibration commands. The first type provides complete calibration. The second
group, called atomic calibration commands, provides calibration for individual portions of the IC.
6.5.1 Complete Calibration Command (“Single Command Calibration”)
There are two calibration commands in this first group: CAL and CALW. Only one of these commands
is needed to calibrate the System/Unit.
To use these commands, a precision voltage source and a precision current source are required for the
calibration routine to use as a reference.
6.5.1.1 CAL Command
To use the CAL command, enter the following:
>CAL
The response is:
TCal OK
VCal OK:
ICal 0 OK:
>
The device would calibrate the temperature (adjust the Temperature Nominal MPU location 0xA6, saves
to flash and will initiate temperature gain compensation), calibrate the voltage (adjusts CAL VA and CAL
VB registers and saves them to flash), and finally calibrate the current (adjusts CAL IA register and saves
to flash).
6.5.1.2 CALW Command
To use the CALW command, enter the following:
>CALW
The response is:
TCal OK
VCal OK:
WCal 0 OK:
>
The device will calibrate the temperature, calibrate the voltage, and finally calibrate the power and save
all values to flash.
The commands are summarized in the following table:
CALx Complete Calibration Commands
Description: Allows the user to Calibrate the IC.
Usage: CAL Calibrates temperature, then voltage,
and finally current.
CALW Calibrates temperature, then voltage,
and finally power.