Software Functional Overview
Control methods and objects related to thermal management are listed in the table below.
Object Description
_ACx Returns Active trip point in tenths Kelvin
_ALx List of pointers to active cooling device objects
_CRT Returns critical trip point in tenths Kelvin
_PSL List of pointers to passive cooling device objects
_PSV Returns Passive trip point in tenths Kelvin
_SCP Sets user cooling policy (Active or Passive)
_TC1 Thermal constant for Passive cooling
_TC2 Thermal constant for Passive cooling
_TMP Returns current temperature in tenths Kelvin
_TSP Thermal sampling period for Passive cooling in tenths of seconds
z _Acx
This control method returns the temperature at which the OS must start or stop Active
cooling, where x is a value between 0 and 9 that designates multiple active cooling levels of
the thermal zone. If the Active cooling device has one cooling level (that is, n”) then that
cooling level is named _AC0. If the cooling device has two levels of capability, such as a
high fan speed and a low fan speed, then they are named _AC0 and _AC1 respectively. The
smaller the value of x, the greater the cooling strength _ACx represents. In the above example,
_AC0 represents the greater level of cooling (the faster fan speed) and _AC1 represents the
lesser level of cooling (the slower fan speed). For every ACx method, there must be a
matching ALx method.
Arguments: None.
Result Code: Temperature in tenths Kelvin
The result code is an integer value that describes up to 0.1 precisions in Kelvin. For example,
300.0K are represented by the integer 3000.
z _ALx
This object evaluates to a list of Active cooling devices to be turned on when the associated
_ACx trip point is exceeded. For example, these devices could be fans.
z _CRT
This control method returns the critical temperature at which the OS must shutdown the
system.
Arguments: None.
Result Code: Temperature in tenths Kelvin
3-32 FIC M295 / M296 Service Manual