LPC47M14X datasheet(19/205 Pages) SMSC

19 / 205 page

SMSC DS – LPC47M14X

Page 19

Rev. 03/19/2001

GP35, GP42, GP53, GP60 and GP61:

Buffers powered by VTR. GP35 and GP53 have IRTX as the alternate function and their output buffers are

active under VTR. GP60 and GP61 have LED as the alternate function and the logic is able to control the pin

under VTR.

The IRTX pins (IRTX2/GP35 and GP53/TXD2(IRTX)) are powered by VTR so that they are driven low when VCC =

0V with VTR = 3.3V. These pins will remain low following a VCC POR until serial port 2 is enabled by setting the

activate bit, at which time the pin will reflect the state of the transmit output of the Serial Port 2 block.

The following list summarizes the blocks, registers and pins that are powered by VTR.

USB Hub

PME interface block

PME runtime register block (includes all PME, SMI, GPIO, Fan and other miscellaneous registers)

“Wake on Specific Key” logic

LED control logic

Fan Tachometers

Pins for PME Wakeup:

◊

GP42/nIO_PME (output, buffer powered by VTR)

◊

nRI1 (input)

◊

GP50/nRI2 (input)

◊

GP52/RXD2(IRRX) (input)

◊

KDAT (input)

◊

MDAT (input)

◊

GPIOs (GP10-GP17, GP20-GP22, GP24-GP27, GP30-GP33, GP41, GP43, GP50-GP57, GP60, and

GP61) – all input-only except GP53, GP60, and GP61. See below.

Other Pins

◊

IRTX2/GP35 (output, buffer powered by VTR)

◊

GP53/TXD2(IRTX) (output, buffer powered by VTR)

◊

GP60/LED1 (output, buffer powered by VTR)

◊

GP61/LED2 (output, buffer powered by VTR)

5.8

MAXIMUM CURRENT VALUES

See the “Operational Description” section for the maximum current values.

The maximum VTR current, ITR, is given with all outputs open (not loaded), and all inputs in a fixed state (i.e., 0V or

3.3V). The total maximum current for the part is the unloaded value PLUS the maximum current sourced by all pins

that are driven by VTR. The pins that are powered by VTR are as follows:

GP42/nIO_PME, IRTX2/GP35,

GP53/TXD2(IRTX), GP60/LED1, GP61/LED2, and CLKI32. These pins, if configured as push-pull outputs, will

source a minimum of 6mA at 2.4V when driving.

The maximum VCC current, ICC, is given with all outputs open (not loaded) , and all inputs in a fixed state

(i.e., 0V or 3.3V).

The maximum VREF current, IREF, is given with all outputs open (not loaded) , and all inputs in a fixed state

(i.e., 0V or 3.3V).

5.9

POWER MANAGEMENT EVENTS (PME/SCI)

The LPC47M14x offers support for Power Management Events (PMEs), also referred to as System Control Interrupt

(SCI) events. The terms PME and SCI are used synonymously throughout this document to refer to the indication of

an event to the chipset via the assertion of the nIO_PME output signal on pin 17. See the “PME Support” section.

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