82801BA datasheet(53/498 Pages) INTEL

53 / 498 page

82801BA ICH2 and 82801BAM ICH2-M Datasheet

3-1

Power Planes and Pin States

3.1

Power Planes

3.2

Integrated Pull-Ups and Pull-Downs

Table 3-1. ICH2 Power Planes

Plane

Description

Main I/O

(3.3V)

Vcc3_3: Powered by the main power supply (or battery for the ICH2-M). When the

system is in the S3, S4, S5, or G3 state, this plane is assumed to be shut off.

Main Logic

(1.8V)

Vcc1_8: Powered by the main power supply (or battery for the ICH2-M). When the

system is in the S3, S4, S5, or G3 state, this plane is assumed to be shut off.

Resume I/O

(3.3V Standby)

VccSUS3_3: Powered by the main power supply (or battery for the ICH2-M) in S0–S1

states. Powered by the trickle power supply (or battery for the ICH2-M) when the

system is in the S3, S4, S5, state. Assumed to be shut off only when in the G3 state

(system is unplugged for the ICH2 or battery removed for the ICH2-M).

Resume Logic

(1.8V Standby)

VccSUS1_8: Powered by the main power supply (or battery for the ICH2-M) in S0–S1

states. Powered by the trickle power supply (or battery for the ICH2-M) when the

system is in the S3, S4, S5, state. Assumed to be shut off only when in the G3 state

(system is unplugged for the ICH2 or batter removed for the ICH2-M).

Processor Interface

(1.3 ~ 2.5V)

V_CPU_IO: Powered by the main power supply via processor voltage regulator. When

the system is in the S3, S4, S5, or G3 state, this plane is assumed to be shut off.

LAN I/O

(3.3V)

(ICH2-M only)

VccLAN3_3: This is a separate power plane that may or may not be energized in S3 -

S5 states depending upon the presence or absence of AC power and network

connectivity. This plane must be on in the S0 and S1 states.

LAN Logic

(1.8V)

(ICH2-M only)

VccLAN1_8: This is a separate power plane that may or may not be energized in S3 -

S5 states depending upon the presence or absence of AC power and network

connectivity. This plane must be on in the S0 and S1 states.

RTC

VccRTC: When other power is available (from the main supply for the ICH2 or battery

for the ICH2-M), external diode coupling will provide power to reduce the drain on the

RTC battery. Assumed to operate from 3.3V down to 2.0V.

Table 3-2. Integrated Pull-Up and Pull-Down Resistors

Signal

Resistor Type

Nominal Value

Notes

EE_DIN

pull-up

24 K

Ω

EE_DOUT

pull-up

24 K

Ω

GNT[B:A]# / GNT[5]# / GPIO[17:16]

pull-up

24 K

Ω

LAD[3:0]# / FWH[3:0]#

pull-up

24 K

Ω

LDRQ[1:0]

pull-up

24 K

Ω

PME#

pull-up

24 K

Ω

PWRBTN#

pull-up

24 K

Ω

SPKR

pull-up

24 K

Ω

1, 5

AC_BITCLK

pull-down

20 K

Ω

2, 6

82801BA Datasheet(PDF) 53 Page - Intel Corporation

82801BA Datasheet(HTML) 53 Page - Intel Corporation

Html Pages

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 32 33 34 35 36 37 38 39 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 ...More

Datasheet Download

Link URL