DOC 02110-1
ACTIA PCs
Page 26 / 52
POWER MANAGEMENT
Note: for convenience, part of the IHMI-MPC documentation concerning power management is reproduced
here. This information is not guaranteed. For up-to-date specifications refer to the IHMI-MPC user’s manual
(DOC02097).
The IHMI-MPC board power supply is managed by a Z8 microcontroller. It allows a PC-compatible system to
be adapted to the specific environment of a vehicle.
System startup and shutdown are automatically synchronized with the start and stop of the vehicle engine
(ignition signal turned on and off) whilst allowing the operating system to close properly. The system can also
be woken up by an incoming call from the GSM module or an internal timer. Operation on the vehicle battery
is only allowed for a certain amount of time, to avoid battery draining.
Optionally, system startup when ignition signal turned on can be disabled. In that case the system startup is
requested by pressing a backlight control button.
The internal temperature of the system is monitored to prevent destruction. The system cannot start if the
temperature is too low and it is forced to shut down correctly if the temperature is too high.
In addition, the microcontroller manages the screen backlight level. Two parameters are taken into account:
the level set by the user using the screen buttons and the light sensor. The level is saved in a non volatile
memory in order to be maintained when the system is turned off and on.
Note: following temperatures and delays are specified for the normal profile. A more aggressive profile can be
configured. Those temperatures and delays can also be modified by software (see PROGRAMMING
INTERFACES chapter for details).
System states
State 1: System powered down. The system is in standby state. 2 hours after entering this state, it switches
into very low consumption mode. The LED is then switched off.
The system can only exit this state if ignition signal is switched on (cf. Z2 in DOC02092) or if a backlight
control button is pressed for at least half a second while ignition signal is on. If this temperature is greater
than 70°C when ignition signal is switched on, the system goes directly into state 8. Otherwise the MPC
processor board is switched on and the system goes into state 3. If the power supply did not report a power
good state within one second, the system goes back in state 1 (error 5). The same, if the MPC processor
board did not start (error 1).
Note: The microcontroller could be configured to switch off is own power supply (cf. Z3 in DOC02092) in
order to have a very low standby current. Warning: in that case, data saved in the GPS are lost.
State 2: System powered down with wakeup timer. This state is similar as state 1 with the difference that
the microcontroller could be programmed with a wakeup timer. This timer could be configured from 1 to
65535 seconds or from 1 to 65535 minutes.
State 3: System powered up with ignition signal. The system can remain in this state for an unlimited
period of time.
If ignition signal is switched off for more than 10 seconds, the system goes into state 6. The MPC processor
board manager could request to switch off the power supply (state 1), or to place the board in standby (state
4). The user can request a change to state 6 by pressing simultaneously both backlight control buttons during
al least 2 seconds. It can also be requested by software (see PROGRAMMING INTERFACES chapter for
details).
If the board temperature e85°C, the IHMI-MP C board requests the MPC processor board manager
to shut down the system and the system goes into state 7.
State 4: System standby. The system goes into this state after a request from the MPC processor board
manager. In this state the MPC processor board switches off all on board power supplies except the memory
(suspend to RAM). This allows a quick startup. The system cannot remain in this state more than 4 hours
while ignition signal is off in order the preserve the vehicle battery.
The system also goes into this state when the MPC processor board turns itself off and GMS and SMBus
wakeup events are enabled. In that case, the wakeup timer controls the maximum time the system can stay
in this state.
Summary of Contents for IHMI
Page 1: ...DOC 02110 revision 1 ACTIA PCs IHMI v2 USER S MANUAL ...
Page 42: ...DOC 02110 1 ACTIA PCs Page 42 52 Module MC75i EDGE World 2 2 ...
Page 43: ...DOC 02110 1 ACTIA PCs Page 43 52 Module PHS8 3G World 1 2 ...
Page 45: ...DOC 02110 1 ACTIA PCs Page 45 52 Module SparkLan WPEA 121N ...
Page 48: ...DOC 02110 1 ACTIA PCs Page 48 52 APPENDICES Mechanical drawings IHMI v2 case ...
