UM0277
User manual
Getting started with the
Cold Thermostat Kit based on AC switches and ST7LITE MCU
Introduction
The STEVAL-IHT001V1 Thermostat Kit (figure below) is designed to control a refrigerator or
a freezer. This thermostat kit enables the control of a single-phase induction motor, a light
bulb and a defrost resistor (or a fan) working on 230 V
RMS
50/60 Hz mains voltage.
The board can operate in an ambient temperature range of 0 to 40 °C. The exact maximum
temperature depends on the power of the loads (Section
3.1: Load power).
The kit includes a Graphic User Interface (GUI) for sending commands to the ST7LITE39F2
Microcontroller or to access MCU information via the Serial Communication Interface (SCI).
This enables users to easily change MCU software parameters and acquire measurements
during appliance testing.
This document provides all the information needed to make the board work (how to connect
it, how it works). For specific information about modifying MCU parameters, please refer to
the “Help” section of the GUI software.
STEVAL-IHT001V1 Thermostat Kit
The main goals of this tool are:
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Evaluate full ST solution (microcontroller + AC switch) for cold thermostat applications
Measure and save the appliance main parameters during operation (load status,
compressor operation duty cycle and running period, evaporator temperature)
Check and analyze efficiency gains by reducing the Hysteresis threshold or adapting
the defrost resistor management
Check the board immunity against fast transient voltages (without GUI connection).
August 2006
Rev 1
1/32
www.st.com
Contents
UM0277
Contents
1
Kit introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
1.2
Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Board presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
2.2
Performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Ensured functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1
2.2.2
2.2.3
2.2.4
Temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Compressor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Light bulb and buzzer operation control . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Defrost resistor (or fan) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ACS and ACST devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ST7LITE39F2 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Capacitive power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3
Hardware features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3.1
2.3.2
2.3.3
2.4
Graphic user interface (GUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
3.2
3.3
3.4
3.5
Load power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measure points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1
3.5.1
3.5.2
3.5.3
3.5.4
11
11
12
13
Using the GUI software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Timing control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Force debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parameter measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
GUI windows description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Appendix A Thermal sensor linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Appendix B Wiring connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Appendix C STEVAL-IHT001V1 thermostat kit. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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UM0277
Contents
Appendix D Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix E Procedure to apply IEC 61000-4-4 bursts test. . . . . . . . . . . . . . . . . 28
Appendix F
PC interface parameters description . . . . . . . . . . . . . . . . . . . . . . . . 29
Appendix G Capacitor value according to country . . . . . . . . . . . . . . . . . . . . . . . 30
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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Kit introduction
UM0277
1
1.1
Kit introduction
Package contents
This package (Figure
1)
includes the following items:
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A thermostat board (ref.: STEVAL-IHT001V1)
A M2020 5k NTC thermistor from EPCOS (ref.: M2020/5k/A17)
A CD-ROM, including products presentations and data-sheets, user manual,
Application Notes and the GUI software.
“Getting Started” User Manual (this document)
The insulated PC interface board (ref.: MC/UNI/0001.01 PC-INTERFACE ver.1.1)
A 230VAC/9VDC insulated power supply for the SCI interface board
One RS-232 Interface cable
One SCI Interface cable
Package contents
Figure 1.
thermostat board
SCI Interface
cable
M2020 5k NTC
230VAC/9VDC
insulated power
supply
RS232 Interface
cable
PC insulated
interface board
4/32
UM0277
Kit introduction
1.2
Board presentation
Figure 2
shows the STEVAL-IHT001V1 board and the main components used on this board.
Figure 2.
Power board (top view)
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1 onc r C a s
A S/ A S
C
CT
S 7 ite
TL
M U
C
P wr
o e
s p ly
up
cpc r
a a ito
O /O F
N F
Ld
e
T m e tu o e
e p ra re rd r
v u liza n
is a tio
S I c n e to
C onc r
B 1 P s B tto
P uh u n
T ndcr
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(te p ra re s le tio )
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This board mainly embeds (refer to
Appendix C
for the complete schematic):
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A capacitor power supply. The average output current of the capacitor power supply is
approximately 25 mA with he embedded 1µF C3 capacitor (for a 230V-50Hz Line RMS
voltage)
A ST7LITE39F2 MCU
AC Switches: one ACS102-6TA, one ACS110-7SB2 and one ACST6-7ST to control
respectively a light bulb, a defrost resistor or fan, and a compressor
ON/OFF LED. This LED switches ON when the board is powered
Temperature order visualization. Three LEDs indicate the temperature order using
three different settings: low, medium and high
BP1 Push Button, to change the temperature order setting
Transducer (or buzzer) to warn the user if the door is opened for an extended time
SCI connector, for communication between the board and a computer (using the GUI
software)
An In-Dart connector, to load the firmware in the MCU
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Warning:
To avoid electrical shock through the computer, if the In-Dart
connector is used to connect a computer, the STEVAL-
IHT001V1 board must be plugged into an insulated mains
plug.
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