General purpose i/o interface, Electrical specifications, Ktt30/mitx users guide – Kontron KTT30-mITX User Manual

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KTD-N0857-A

Page 25

Pin Connectors



KTT30/mITX Users Guide

The General Purpose I/O‘s and a few other signals are available through the Feature connector J36.

Signal

Description

CASE_OPEN#

This signal is used to detect if the system case has been opened.

CORE_PWR_ON

This signal is an active high indication that the T30 CORE rail has been enabled. The signal is
buffered for LED usage.

DEEP_SLEEP

This signal is an active high indication that the system has entered the deep sleep mode. The
signal is buffered for LED usage.

EXT_BAT

EXTernal BATtery option for connecting the plus pin or terminal of an external primary cell battery
(2.5 to 4.0V). The minus pin or terminal should be connected to a GND pin. The external battery is
protected against charging and can be used with or without the onboard battery installed.

CPU_PWR_ON

This signal is an active high indication that the T30 CPU rail has been enabled. The signal is
buffered for LED usage.



The three signals for LED usage assume the following states during power management:

Signal

ACTIVE

SUSPEND

DEEP SLEEP

CORE_PWR_ON

High

High

Low

CPU_PWR_ON

High

Low

Low

DEEP_SLEEP

Low

Low

High

General Purpose I/O Interface

The General Purpose I/O interface is a subset of a multifunction part from NVIDIAs

®

Tegra

®

3 SoC. All I/O

pins have additional functionalities which can be changed by software.

The I/O signals are decoupled to 3.3V voltage level by voltage level translators. With one I/O line (NVIDIA

®

label: Q.00) you can enable or disable all voltage level translators:

Active state

high level

Tri-state

low level

Electrical Specifications

Digital Outputr

Min.

Typ.

Max.

Units

Output LOW voltage

+0.4

V

Output HIGH voltage

+2.9

+3.3

V

Continuous output current per pin

8

mA

Switching rate (Linux)

tbd.

kHz

Digital Input

Min.

Typ.

Max.

Units

Input LOW voltage

+1.1

V

Input HIGH voltage

+2.2

3.3

+3.8

V

Input rate (Linux)

tbd.

kHz

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