VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Page 31
32
Page 32
33
Page 33
34
Page 34
35
Page 35
36
Page 36
37
Page 37
38
Page 38
39
Page 39
40
Page 40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
Page 32/128:

Resets and Clocks

Download datasheet (2Mb)Embed
PrevNext
7HFKQRORJLHV ,QF
Signal Name
Pin #
PWRGD
W6
B16
PCIRST#
J1
RSTDRV
BCLK
H5
OSC
E4
RTCX1
Y5
RTCX2
W5
T8
SLOWCLK / GPO0
Signal Name
Pin #
VCC
F7, F10, F12-F14,
H6, H15, J6, J15,
K6, K15, M6,
M15, N6, N15,
R7-R8, R11, R14
GND
F6, F11, F15, G6,
G15, J9-J12, K9-
K12, L6, L9-L12,
L15, M9-M12,
P6, P15, R6, R15
VCCS
R9-R10
Y6
VBAT
VREF
T13
VCCH
R12
R13
GNDH
F9
VCCU
GNDU
F8
Revision 1.71 June 9, 2000

Resets and Clocks

I/O
Signal Description
I
Power Good. Connected to the PWRGOOD signal on the Power Supply.
O
PCI Reset. Active low reset signal for the PCI bus. The VT82C686B will
assert this pin during power-up or from the control register.
O
Reset Drive. Reset signal to the ISA bus. Connect through an inverter to the
chipset north bridge RESET# input and to PCI bus RESET#.
O
Bus Clock. ISA bus clock.
I
Oscillator. 14.31818 MHz clock signal used by the internal Timer.
I
RTC Crystal Input: 32.768 KHz crystal or oscillator input. This input is
used for the internal RTC and for power-well power management logic.
O
RTC Crystal Output: 32.768 KHz crystal output
O
Slow Clock. .Frequency selectable if PMU function 4 Rx54[1-0] is nonzero
(set to 01, 10, or 11).
Power and Ground
I/O
Signal Description
P
Core Power. 3.3V nominal (3.15V to 3.45V). This supply is turned on only
when the mechanical switch on the power supply is turned on and the
PWRON signal is conditioned high. This pin should be connected to the
same voltage as the CPU I/O circuitry. Internally connected to hardware
monitoring system voltage detection circuitry for 3.3V monitoring.
P
Ground. Connect to primary motherboard ground plane.
P
Suspend Power. Always available unless the mechanical switch of the power
supply is turned off. If the “soft-off” state is not implemented, then this pin
can be connected to VCC. Signals powered by or referenced to this plane are:
PWRGD, RSMRST#, PWRBTN#, SMBCLK, SMBDATA, SUSCLK,
SUSA# / GPO1, SUSB# / GPO2, SUSC#, SUSST1# / GPO6, GPI1 / IRQ8#,
GPI2 / BATLOW#, GPI3 / LID, GPI5 / PME#, GPI6 / SMBALRT#, GPI7 /
RING#, GPO0
P
RTC Battery. Battery input for internal RTC (RTCX1, RTCX2)
P
Voltage Reference (5V 5%). For thermal sensing and 5V input tolerance.
P
Hardware Monitor Power.
(voltage monitoring, temperature monitoring, and fan speed monitoring).
Connect to VCC through a ferrite bead.
P
Hardware Monitor Ground. Connect to GND through a ferrite bead.
P
USB Differential Output Power.
(USBP0+, P0-, P1+, P1-, P2+, P2-, P3+, P3-). Connect to VCC through a
ferrite bead.
P
USB Differential Output Ground. Connect to GND through a ferrite bead.
-26-
VT82C686B
Power for hardware monitoring subsystem
Power for USB differential outputs
Pinouts