Congatec conga-SBM2C, Руководство пользователя

Страница: 19 / 24

5 Power Button, Beeper and I/O
5.1 Power Button
The conga-SBM²C is intended to be used to control the power of the complete system.
The signal is pulled-up internally so there is no need for an external pull-up resistor on
the carrier baseboard. Pull the signal low by a pushbutton to control the conga-SBM²C
module. There is no need for special debounce components because the controller
onboard the conga-SBM²C will debounce the pushbutton signal via software.
The pushbutton behavior is generally comparable to the button in a standard ATX
system.
Button Down Time Functionality
120 ms < t < 4 s Turn on
Turn off, shutdown Windows
t > 4 s Instant off
5.2 Beeper Control
The conga-SBM²C provides an active high beeper output signal. The maximum load on
this pin should not exceed 10mA. The output voltage level on this pin is 3.3V/5V and
follows uC_VCC.
Beeper Functionality
3 beeps Warning level, configurable
continuous beep Alarm level, configurable
5.3 I/O Control
The conga-SBM²C supports the Philips/NXP PCA9555 I²C I/O controller
(http://www.nxp.com). You can attach LEDs to indicate different modes and statuses.
The conga-SBM²C addresses the PCA9555 using the addresses shown below.
I²C address HEX MSB LSB
7 bit 0x20 0 1 0 0 0 0 0
8 bit 0x40 0 1 0 0 0 0 0 R#/W
Make sure you configured the PCA9555 address jumpers to the specific address.
Copyright © 2008 congatec AG SBM2Cm11 19/24