A
B
C
D
E
F
H
F
Control Panel Demonstration
5.7
EEPROM Correction Registers
The EEPROM Correction Registers are the seven registers in the bq76925 that store the offset and gain
values for the VCn circuits and the VREF circuit. These values can be different for each device. See the
data sheet for additional details.
Each gain value is derived from the top four bits (nibble) of the register value. This number is a signed 2
’
s
complement representation in the range of
–
8 to +7. The units are in mV.
Each offset value is derived from the bottom four bits (nibble) of the register value. This number is a
signed 2
’
s complement representation. The units are in 0.1%.
5.8
Startup Config Tab
The Startup Config tab is a convenience feature. It allows the user to set the way the bq76925 Evaluation
Software initializes each time it is started or when the Find Target Command is issued.
This tab specifies the settings of the Control Registers 0x00 to 0x05 when the Enable checkbox is
checked.
Figure 15. Startup Config Tab in the Control Panel
5.9
Configuration Control
The Configuration Control section displays some of the options that a user may want to have preselected
each time the software starts. The features are listed by description rather than bit location and value (1 or
0). Again, this is a convenience feature, and usage of this tab is purely optional.
(A) A drop-down box for the Current Comparator threshold setting has values of 25, 50, 75,
…
, 375, 400
mV. These are bits 4 to 7 in the CONFIG_1 register.
(B) Two radio buttons allow the user to select the current polarity for the Current Comparator Threshold.
This is bit 3 of the CONFIG_1 register.
24
bq76925EVM Evaluation Module
SLUU514
–
July 2011
Copyright
©
2011, Texas Instruments Incorporated
