Advantech SPC-57 user manual JP 3 LCD signal voltage level select, JP 4 Power switch header

★JP 3 : LCD signal voltage level select

Pin Number	Pin function	Ps.
1	SYS_VCC	+5V
2	LCD_VCC	power of LCD-signal
		buffers
		+3.3V. VCC3P3 will
3	VCC3P3	change to 0V when
		system enter sleep mode.

Note: when User wants to use CN18 (40 pin TTL level LCD signal) to drive LCD panel, user needs to setup this pin header. If the LCD panel signal is 3.3V then set the 2.00mm jumper at 1-2 pin of JP3; if the LCD panel signal is 5V then set the jumper at 2-3 pin.

★JP 4 : Power switch header

Pin Number	Pin function	Ps.
1	POW_SW_P	connect to power switch
		positive pole
2	POW_SW_N	connect to power switch
		negative pole

Note: Only pin 1 is shorted with pin 2 of JP4, the system power is on.

★CN 1 : PCMCIA accessing status port

Pin Number	Pin Function	Ps.
1	Resv.
2	Resv.
3	PCM_RDY
4	PCM_VR

Note: If user wants to know the accessing status of PCMCIA slot, user can directly connect the LED positive pole to 4th pin and negative pole to 3rd pin.

★CN 3 : multi-function I/O header (I)

Pin Number	Pin Function	Ps.
1	Resv.
2	Resv.
3	Resv.
4	Resv.
5	Resv.
6	Resv.
7	DI 0*	Digital input bit 0.
8	DO 0*	Digital output bit 0.
9	DI 1*	Digital input bit 1.
10	DO1*	Digital output bit 1.
11	DI 2*	Digital input bit 2.
12	DO2*	Digital output bit 2.
13	DI 3*	Digital input bit 3.
14	DO3*	Digital output bit 3.
15	DI 4*	Digital input bit 4.
16	DO 4*	Digital output bit 4.

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