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3.13 LEMT functions
The onboard Microcontroller implements power sequencing and LEMT (LiPPERT Enhanced
Management Technology) functionality. The microcontroller communicates via the System
Management Bus with the CPU/Chipset. The following functions are implemented:
•
Total operating hours counter
Counts the number of hours the module has been run in minutes.
•
On-time minutes counter
Counts the seconds since last system start.
•
Power cycles counter
•
Watchdog Timer
Set / Reset / Disable Watchdog Timer.
•
System Restart Cause
Power loss / Watchdog / External Reset.
•
Flash area
1kB Flash area for customer data
•
Protected Flash area
128 Bytes for Keys, ID's, etc. can stored in a write- and clear-protectable region.
•
Board Identify
Vendor / Board / Serial number
3.14 Watchdog
A watchdog timer is integrated on-board and managed by the LEMT. There are two different
possibilities for its activation. One event is caused by under voltage protection.
The watchdog LED get flashed after restart, but only if the power supply had stood over 4,2 Volts.
The other watchdog event is triggered by internal circuit of the ITE8712 Super I/O. It is possible to
program the trigger duration, see chapter 4.3 for an example.
3.15 Speaker
The speaker signal is located on the IDC10 Header PS/2. A standard PC Speaker can be connected
between the signal SPEAKER and VCCKB.
TME-104-CLR-LX800-R1V3.doc
Pin
Signal
1
Speaker
3
Reset-In
5
KB Data
7
GND
9
Ext. Battery
Rev. 1.3
Pin
Signal
2
Mouse Clock
4
Mouse Data
6
KB Clock
8
+5 Volt Standby
10
Power Button (default)/
Reset-In
28(53)
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