mITX-SKL-H – User Guide, Rev.1.1
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Pin
Signal
Type
Ioh / Iol
Pull U / D
Note
35
EGAD
8 /8 mA
36
TMA0
O
37
+12 V
PWR
38
GND
PWR
39
NC
40
NC
41
GND
PWR
42
GND
PWR
43
GND
PWR
44
S3#
O
25 /25 mA
Signal Description
Signal
Description
INTRUDER#
Also known as, CASE OPEN. Used to detect if the system case has been opened. This signal’s
status is readable, so it may be used like a GPI when the intruder switch is not required.
SMBC
SMBus clock signal
SMBD
SMBus data signal
S3#
S3 sleep mode, active low output, optionally used to deactivate external system.
S4#
S4 sleep mode, active low output, optionally used to deactivate external system.
PWR_OK
Power OK, signal is high if no power failures are detected.
(This is not the same as the P_OK signal generated by ATX PSU).
EXT_BAT
(EXTernal BATtery) option for conn terminal of an external primary cell battery
(2.5 V - 3.47 V) (– terminal connected to GND).
The external battery is protected against charging and can be used with or without the on-board
battery installed.
SB3V3
Maximum load is 0.75 A (1.5 A < 1 sec.)
SB5 V
S5 V supply.
GPIO0..17
General Purpose Inputs/Output - These signals may be controlled or monitored with the use of
the KT-API-V2 (Application Programming Interface).
EGCLK
Extend GPIO clock signal
EGAD
Extend GPIO address data signal
EGCS#
Extend GPIO chip select signal, active low
TMA0
Timer output
+12 V
Maximum load is 0.75 A (1.5 A < 1 sec.)
GND
Power Supply GND signal
The GPIOs are controlled via the ITE IT8528E Embedded Controller. Each GPIO has 100 pF to ground, clamping diode to
3.3 V and has multiplexed functionality. Some pins can be DAC (Digital to Analogue Converter) output, PWM (Pulse
Width Modulated) signal output, ADC (Analogue to Digital Converter) input, TMRI (Timer Counter Input), WUI (Wake Up
Input), RI (Ring Indicator Input) or some special function.
Signal Description IT8528E Embedded Controller
Signal
IT8528E Pin Name
Type
Description
GPIO0
DAC0/GPJ0
AO/IOS
GPIO1
DAC1/GPJ1
AO/IOS
