Intel VC820 - Desktop Board Motherboard Design Manual page 223

8 7
System
D
VCC5 VCC5
VCC3_3
U19
IDEACTP# 1
24
SN74LVC07A
VCC3_3
C
U19
VCC
9
IDEACTS#
24
GND
SN74LVC07A
JP25
1
SPKR 2
11
3
Onboa rd S pkr JP 25
E nable* 2-3
Dis able 1-2
B
A
8 7
6
VCC3_3SBY
No stuff.
For test only
ICH has internal pullup and debounce on PWRBTN#
0K
SW1 R257
PWRBTN_FP#
VCC
2 IDE_ACTIVE
GND
8
Speaker Circuit
AC97_SPKR
15
PC_BEEP
R350
2.2K
VCC3_3SBY
SBY_LED_CR
2
1
Onboard LED indicates the standby well is on
to prevent hot swapping memory.
For debug only.
6
5 4
VCC3_3
VCC5
PWRBTN#
11
IRRX
14
C267
No stuff.
IRTX
1UF For test only 14
R356
470
HDLED_R
VCC3_3 VCC5
C354 C355
470PF 470PF
KEYLOCK#
14
SPKR_FP
R352
SPKR_Q
68
Q15 C
R353
3
P_BEEP B 1 68
2
C353
E
VCC3_3SBY
VCC3_3SBY
U14
VCC
11 GPIO23_FPLED 3 4 1
LED_PU0
GND
SN74LVC07A
DUAL_COLOR
5 4
3 2
1 1
2 2
J25
1
2
82 IRTX_R
3
5% INFRARED
R357
4
5 KEY
6
7
C316
8
POWER SW.
9
10
11
12
13 KEY
H.D. LED
14
15
16 KEY
17 POWER LED
R355 18 KEY
PLED_R
19
220
20 KEY
21
KEYLOCK
22
23
24 KEY
C327
SPEAKER
25
26
FNT_PNL_CONN
VCC5
SP1
+
1
POS
2
NEG
SPKR_ONBOARD
C322
VCC3_3SBY
VCC3_3SBY
PWM outputs from SIO need power buffers for driving fan inputs.
U14
VCC
2 6 5 GPIO26_FPLED 11
LED_PU1
GND
SN74LVC07A
CR6
TITLE: INTEL(R) 820 CHIPSET DUAL PROCESSOR CUSTOMER REFERENCE BOARD
SYSTEM
PCD PLATFORM DESIGN
R
1900 PRAIRIE CITY ROAD
FOLSOM, CALIFORNIA 95630
3 2
1
D
TACH2
VCC12
VCC3_3
JP22
1
2
3
TACH2
PWM1
C
VCC12
VCC3_3
JP24
1
2
3
PWM1
14
PWM2
VCC12
B
VCC3_3
JP23
1
2
3
PWM2
14
A
REV:
3.03
DRAWN BY: PROJECT:
LAST REVISED: SHEET:
11-29-1999_14:46 20 OF 38
1