Datasheet

www.ti.com

Advanced bqMTester Instructions

NOTE: If this test is disabled, the values from the Golden Image File will be used and not the

values currently in the part.

4.6.4 Temperature Calibration

Temperature Calibration can be selected by placing a check in its selection box, or deselected by

removing the check. The default is checked. The temperature calibration area also offers three different

temperature probe selections or five different temperature probe selections for some devices. The proper

selections should be made depending on the application.

NOTE: If this test is disabled, the values from the Golden Image File will be used and not the

values currently in the part.

4.6.5 Pack Current Calibration

Pack Current Calibration can be selected by placing a check in its selection box or deselected by

removing the check. The default is for it to be checked. On (External Load) should always be selected

(this configuration is the default). Off (Bypassed) should never be selected and is only included for

possible future use.

NOTE: If this test is disabled, the values from the Golden Image File will be used and not the

values currently in the part.

4.6.6 Board Offset Frame

This frame will be grayed out if not selected in the Type of calibration to perform frame. Due to

simplified single ground circuit design, a separate board offset is required for each device. The board

offset calibrates all the errors that the CC Offset does not calibrate out. This includes the board layout,

sense resistor, and other offsets that are external to the board. The max offset value is auto-populated by

the software and can be changed. The board offset frame value is in µV and defaults to 100 µV for most

parts. In the unlikely event that there is a great number of calibration failures due to board offset

calibration, you can loosen the constraints for board offset calibration. Contact TI for questions on how to

do this, if required.

4.6.7 Current Frame

This frame is grayed out if it is not selected in the Type of calibration to perform frame. This frame

contains two values:

1. Sense Resistor: Enter the value of the sense resistor used in the gas-gauge–based smart battery

pack in the Sense Resistor field. This value is entered in units of mΩ. The sense resistor value can be

found from the EVM schematic.

2. % Error: Enter the desired acceptable percent error that the sense resistor can differ from the value

listed in the Sense Resistor field in the % Error field. This % Error field is used as a rough test to

make sure the sense resistor is mounted correctly and not shorted. After the bqMTester calibrates the

Sense Resister gain value, then it compares the new calibration value to what is in the Sense

Resistor field. If the percent difference between the two values is more than 25% then it fails the

calibration because it assumes something must be grossly wrong to get a value more than 25% from

the nominal Sense Resistor Value. This value must be specified as a positive integer value.

NOTE: The default value for this field is 25%. The value of 25% may seem like a large number, but

this value is not related to the calibration accuracy to which the bqMTester calibrates. That

calibration is highly accurate.

SLUU397A– February 2011– Revised May 2011 Advanced bqMTester

Submit Documentation Feedback