SCP SCIENCE
20
KeyPad
Version 1.0
CONTROLLER GENERAL DESCRIPTION
The following fi gure shows a general block diagram
of the KeyPad controller and all the interaction
between components. Each part will be explained
in details in a different section of the document.
The KeyPad controller system is composed of
a keypad to enter information regarding set point
temperature and controlling time to a CPU, which
controls the DigiPREP block (Jr, MS, LS, HP or HT).
FIGURE 5: GENERAL KEYPAD BLOCK DIAGRAM
Host CPU
Module
LCD Display
PC DTE (RS 232 COM)
Debug/Update
RTD Input
Circuit
A/D
UIPS
Module
Regulators and
Voltage Reference
Heater Drive
Module
Heating
Block
Buzzer/
Alarm
(optional)
(100- 260Vac)
115/230 Vac
+12Vdc
+5V digital
+5V analog (AVCC)
RTD sensor
KEYPAD
Selector /
Signal_Out
Accessories Connector
(I/O, PWM and ADC)
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