April 2007
Rev 1
1/27
UM0408
User manual
Security door keypad controller
Introduction
This document describes the operation of a keypad controller for use in security door
applications. The aim is to assist in the development of a keypad decoding system and to
display associated information through LEDs for all necessary actions such as power on,
door open and error. The entire system has been developed to target low-end and low-cost
application areas and has been realized with the help of the ST7FLITE39 microcontroller. A
useful additional feature is the support of system protection from physical intrusion, using
the STM1403.
The associated evaluation board (order code STEVAL-IAS001V1) aims to display the
capabilities of ST's general purpose microcontroller to fit the market segment of home
automation and security, keeping the system cost as low as possible.
The board can operate in 2 modes:
■
User (stand-alone) mode
■
Administrator mode
– through board
– through PC Graphical User Interface
System operation in the various modes is explained through the document sections. When
the board is connected to the power supply the system enters the user configuration mode.
Administrator mode can be accessed through the use of a PC, where SCI communication is
set up and used between the PC and the board through the RS232.
At the time of manufacturing an additional board has been connected to allow in-circuit
programming of the microcontroller. The two can be easily disconnected so that the keypad
controller for the security door evaluation board can be used independently.
To summarize, the key features of the evaluation board include:
■
4x3 key matrix
■
3 LEDs (green for power, red for error and yellow for magnetic lock)
■
4 jumpers for physical intrusion detection with battery back-up and buzzer
■
On-board SPI EEPROM for event logging
■
On-board RS232 driver to interface with the PC
■
Power supply adaptor (3.4V - 19V)
■
Embedded in-circuit programming capability
www.st.com
