Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Field Format Description
Design capacity
of Warning
Design Capacity
of Low
Cycle Count
Measurement
Accuracy
Max Sampling
Time
Min Sampling
Time
Max Averaging
Interval
Min Averaging
Interval
Battery Capacity
Granularity 1
Battery Capacity
Granularity 2
Model Number
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
Integer
(DWORD)
String
(ASCIIZ)
OEM-designed battery warning capacity. See Section 3.9.4, “Low
Battery Levels.”
• 0x000000000 – 0x7FFFFFFF in [mWh] or [mAh]
OEM-designed low battery capacity. See Section 3.9.4, “Low Battery
Levels.”
• 0x000000000 – 0x7FFFFFFF in [mWh] or [mAh]
The number of cycles the battery has experienced. A cycle is defined as:
An amount of discharge approximately equal to the value of Design
Capacity.
• 0x000000000 – 0xFFFFFFFE
• 0xFFFFFFFF – Unknown cycle count
The accuracy of the battery capacity measurement, in thousandth of a
percent. (0% - 100.000%) For example, The value 80000 would mean
80% accuracy.
The sampling time is the duration between two consecutive
measurements of the battery’s capacities specified in _BST, such as
present rate and remaining capacity. If the OSPM makes two succeeding
readings through _BST beyond the duration, two different results will be
returned.
The Max Sampling Time is the maximum sampling time the battery can
support, in milliseconds.
0xFFFFFFFF is returned if the information is unavailable.
The Min Sampling Time is the minimum sampling time the battery can
support, in milliseconds.
0xFFFFFFFF is returned if the information is unavailable.
The Average Interval is the length of time (in milliseconds) within which
the battery averages the capacity measurements specified in _BST, such
as remaining capacity and present rate.
The Sampling time specifies the frequency of measurements, and the
average interval specifies the width of the time window of every
measurement.
This field indicates the maximum Average Interval that the battery
supports.
This field indicates the minimum Average Interval that the battery
supports
Battery capacity granularity between low and warning in [mAh] or [mWh].
That is, this is the smallest increment in capacity that the battery is
capable of measuring. See note below for more details
Battery capacity granularity between warning and Full in [mAh] or [mWh].
That is, this is the smallest increment in capacity that the battery is
capable of measuring. This may be a different value than Battery
Capacity Granularity 1 to accommodate systems where the granularity
accuracy may change depending on the battery level. See note below for
more details.
OEM-specific Control Method Battery model number
574 April, 2015 Version 6.0