ZiLOG Worldwide Headquarters • 532 Race Street • San Jose, CA 95126 • www.zilog.com
Kit Contents
•
Thermostat Application Module
•
CD-ROM: Software Examples and Documentation
Overview
The Thermostat Application Module provides a flexible platform for training and
experimentation on a number of ZiLOG microcontroller and microprocessor
devices. The module contains no processor. It is designed to attach to the eZ80
Development Platform, which contains both the processors and the control pro-
grams that make the development platforms function. Figure 1 shows a top view
of the Thermostat Application Module.
The Thermostat Application Module provides the following functionality:
•
Simple bit-I/O (LEDs, switches, lamp, and fan)
•
Alphanumeric LCD display via the GPIO interface
Figure 1. The Thermostat Application Module
ZiLOG Development Platforms
Thermostat Application
Module Kit
PUG001402-0103
Product User Guide
Product User Guide PUG001402-0103 Module Block Diagram
ZiLOG Development Platforms
Thermostat Application Module Kit
2
•
Temperature sensor via the I
2
C interface
•
EEPROM data storage via the I
2
C interface
•
Flash program storage for eZ80 family devices
Using simple bit I/O functionality, the user can experiment with the basic I/O and
interrupt functionality of the target processor. By combining the temperature sen-
sor with the lamp and fan actuation, more sophisticated real-time process control
loop experiments can be conducted. The LCD display provides general utility
toward developing more sophisticated user interfaces. Software drivers for the
LCD display and the I
2
C interface exist for several of the ZiLOG processor fami-
lies. Check the ZiLOG website for the latest versions available.
Module Block Diagram
A block diagram of the Thermostat Application Module appears in Figure 2, which
illustrates four major functional areas, all of which interface to the host processor
through a plug-in header. These functional areas are:
1. GPIO for simple user interface functions.
2. GPIO for LCD interface.
3. I
2
C for temperature sensor and EEPROM interface.
4. Flash memory for program storage (eZ80 option).
Figure 2. Thermostat Application Module Block Diagram
LCD Display
DMC16249B
I C EEPROM
24LC128
Pushbuttons
and LEDs
I C Temperature
Sensor
MAX6625
Thermostat Application Module I C Bus
Address/Control
Data
GPIO
GPIO
7
2
3
3
Host Processor
Interface Header
HW 1 I C
GPIO
GPIO
GPIO
GPIO
2
HW 2 I C
2
SW I C
2
Optional
Flash Memory
MT28F008B
Fan
Lamp
2
2
2
Product User Guide PUG001402-0103 Module Block Diagram
ZiLOG Development Platforms
Thermostat Application Module Kit
3
GPIO for Simple User Interface
The Thermostat Application Module provides the following simple user interface
functions:
•
3 Pushbutton switches (input)
•
3 LEDs (output)
•
1 Lamp (output)
•
1 Fan (output)
Each of these simple functions is individually controlled (or sensed) by a single I/O
line of the target processor.
The lamp and fan are powered from a 9VDC power supply. This supply is
provided by a separate power connector on the Thermostat Application
Module, or via the interface connector to the development platform. If the
9VDC supply is not present, all functions of the Thermostat Application
Module still operate correctly; however, the lamp and fan do not activate.
GPIO for LCD Interface
The Thermostat Application Module provides a 2x16-character LCD display that
uses an industry-standard 4-bit parallel interface. This interface is implemented
using 7 GPIO lines and software. The LCD can be used for a more sophisticated
menu-driven user interface or status display.
I
2
C Interface
The Thermostat Application Module implements a 2-wire I
2
C bus to provide com-
munication to the temperature sensor and the EEPROM. Because different pro-
cessors offer multiple hardware I
2
C channels, as well as the possibility to produce
I
2
C using only GPIO and software, a hardware multiplexer is provided between
the processor interface connector and the I
2
C devices on the module. As a result,
three different source pin combinations are permitted on the development plat-
form. Selection of the multiplexer input is performed by GPIO control. Assignment
of the source channels is a function of the development platform attached to the
Thermostat Application Module, as well as the application software running on
that development platform. Software drivers for the I
2
C bus exist for several of the
ZiLOG processor families. Check the ZiLOG website
for the latest version avail-
able.
Flash Memory
A 1MB Flash memory device is included on the Thermostat Application Module
for use with eZ80 systems. This memory can be mapped into the memory space
of the eZ80 by use of the eZ80’s chip select pins. Optionally, by removing a
Note:
Product User Guide PUG001402-0103 Hardware Requirements
ZiLOG Development Platforms
Thermostat Application Module Kit
4
jumper, this memory can be disabled from use by the eZ80. This memory allows
demonstration applications specifically related to the Thermostat Application Mod-
ule to be loaded and available as soon as the module is connected to an eZ80
system. The memory is of a general-purpose nature, and can be utilized for any
appropriate purpose.
Hardware Requirements
The Thermostat Application Module requires a development platform to function.
Supported combinations of development platforms are indicated in Table 1.
The Thermostat Application Module requires 5VDC @ 50mA, which is provided
by the development platform interface connectors. To operate the lamp and fan,
an additional 9VDC @ 450mA supply is required. Presently, only the eZ80 and
Z8 Encore! development platforms provide this supply across the development
platform interface connectors. To use the Thermostat Application Module with
other development platforms, an external 9VDC power supply must be used.
Setup and Installation
Jumper Locations
This section discusses the three jumpers that are located on the Thermostat
Application Module, as indicated in Figure 3. These jumpers can be repositioned
to meet the requirements of the application developer.
Table 1. Development Platforms Supporting the Thermostat Application Module
Development Platform Processor
Development Platform
Part Numbers
eZ80 Evaluation Board eZ80190 eZ801900110ZCO
eZ801900111ZCO
eZ801900210ZCO
eZ801900211ZCO
eZ80 Development Platform eZ80L92 eZ80L920210ZCO
eZ80F91 eZ80F910200ZCO
eZ80F92/F93 eZ80F920200ZCO
Z8 Encore! Development Platform Z8 Encore! Z8ENCORE000ZCO
Product User Guide PUG001402-0103 Setup and Installation
ZiLOG Development Platforms
Thermostat Application Module Kit
5
Write Protect Jumper for Flash Memory (J5)
When installed, the boot sector area of Flash memory on the Thermostat Applica-
tion Module cannot be altered. This J5 jumper must be removed to reprogram this
boot sector. The default position for this jumper is
Installed
.
Chip Select Jumper for Flash Memory (J10)
If the J10 jumper is installed, Flash memory on the Thermostat Application Mod-
ule is not enabled. If installed in the CS2 (upper) position, chip select 2 of the
eZ80 is used to enable Flash memory. This CS2 position is the default for use with
the eZ80 Evaluation Board for the eZ80190 device. If installed in the CS3 (lower)
position, chip select 3 of the eZ80 is used to enable Flash memory. This CS3 posi-
tion is the default for use with the eZ80 Development Platform.
External 9VDC Power (J9)
When the J9 jumper is installed, 9VDC power is drawn from the development
platform via header J6. The external 9VDC power connector (J1) is still con-
nected. The default position is
Not Installed
.
Figure 3. Thermostat Application Module Block Diagram
SW1 SW2 SW3
LED1 LED2 LED3
LCD Display
J6
J9
11
J8
U1
Fan
Lamp
Lamp
Socket
(Under Lamp)
J5
J10
J1
Product User Guide PUG001402-0103 Interface Connector Pin Description
ZiLOG Development Platforms
Thermostat Application Module Kit
6
Installation Procedure
The Thermostat Application Module is designed to be attached to the top of one of
the ZiLOG development platforms listed in T
able 1. The pins located on the top of
the Thermostat Application Module J6 and J8 headers are available for the attach-
ment of test probes.
Always use a grounding strap to prevent damage resulting from electrostatic dis-
charge (ESD).
1. The Thermostat Application Module should be aligned with the J6 and J8
connectors of the development platform. Firm downward pressure must be
applied to seat the connectors.
Because there is no keying of the connectors, care should be exercised to en-
sure correct alignment and orientation.
2. If operation of the lamp and fan is required, a 9VDC source must be provided.
For the eZ80 Evaluation Board for the eZ80190 device, that source must be
an external power supply connected to J1. For the eZ80 and Z8 Encore!
development platforms, that supply can either be the external power supply or
the development platform itself. If development platform power is to be used,
disconnect the external power supply from J1 and insert a jumper into J9.
Interface Connector Pin Description
The interface connectors J6 and J8 provide both the method to connect the Ther-
mostat Application Module to the development platform as well as a convenient
attachment point for test equipment. Connector J6 provides access to the I/O port
bits and connector J8 provides access to the eZ80 address and data buses.
Different development platforms assign different I/O pins to the various functions
available on the Thermostat Application Modules. This differentiation is necessary
due to the different number of I/O pins available on the various processors sup-
ported. The I/O pin assignments are listed in Table 2.
Caution:
Caution:
Product User Guide PUG001402-0103 Interface Connector Pin Description
ZiLOG Development Platforms
Thermostat Application Module Kit
7
Table 2. J6 I/O Pin Assignments by Development Platform*
Thermostat
Application
Module Pin
Development Platform I/O Pin Thermostat
Application
Module
Function
Active
StateeZ80190 eZ80L92 eZ80F91
eZ80F92/
eZ80F93
Z8
Encore!
54 PB0 PB0 PB0 PB0 PC1 Switch S1 Low
52 PB1 PB1 PB1 PB1 PC0 Switch S2 Low
50 PB2 PB2 PB2 PB2 PC2 Switch S3 Low
48 PB3 PB3 PB3 PB3 PC3 Lamp High
46 PB4 PB4 PB4 PB4 PC6 LED 1 High
44 PB5 PB5 PB5 PB5 PC7 LED 2 High
42 PB6 PB6 PB6 PB6 PC5 LED 3 High
40 PB7 PB7 PB7 PB7 PC4 Fan High
36 PD0 PD0 PD0 PD0 PA6 I
2
C SCL—
Source #1
—
34 PD1 PD1 PD1 PD1 PA7 I
2
C SDA—
Source #1
—
33 PA1 EM_D1 EM_D1 EM_D1 PE1 LCD/Write
(Control)
—
31 PA2 EM_D2 EM_D2 EM_D2 PE2 LCD/Read
(Control)
—
29 PA3 EM_D3 EM_D3 EM_D3 PE3 LCD
RegSelect
(Control)
—
28 PD4 PD4 PD4 PD4 PA3 I
2
C MUX
Select LSB
High
27,25,23,21 PA4:7 EM_D4:7 EM_D4:7 EM_D4:7 PE4:7 LCD DB4:7
(Data Bus)
—
24 PD6 PD6 PD6 PD6 PA1 I
2
C SCL—
Source #0
—
22 PD7 PD7 PD7 PD7 PA0 I
2
C SDA—
Source #0
—
10 N/C ID_0 ID_0 ID_0 ID_0 I
2
C Mux Select
MSB
High
7N/CSDA SDA SDA SDA I
2
C SDA—
Source #2
—
5N/CSCL SCL SCL SCL I
2
C SCL—
Source #2
—
Note: *Pin assignments for the eZ80L92, eZ80F91, and eZ80F92/eZ80F93 devices are identical.
Product User Guide PUG001402-0103 Programming Considerations
ZiLOG Development Platforms
Thermostat Application Module Kit
8
Due to the high-speed nature of the signals on the J8 connector, care should be
exercised in the electrical loading of these pins if test equipment or other circuitry
is attached.
Care should be exercised when developing or modifying software to operate with
the Thermostat Application Module to ensure that the correct I/O mapping is se-
lected for the processor chosen.
Programming Considerations
The Thermostat Application Module contains four elements that require sophisti-
cated programming techniques for proper operation. To ensure proper operation
of these devices, the manufacturer data sheets for the devices should be con-
sulted if the user intends to write code to work directly with these devices. See
Table 3.
If ZiLOG-provided drivers are used, the information in Table 3 is not
required.
Sample Software Project
A typical application for the Thermostat Application Module is to implement a
Heating Ventilation & Air Conditioning (HVAC) system simulation. In this example,
a means is provided to establish upper and lower temperature limits. The temper-
ature sensor is read on a periodic basis. If the temperature is discovered to be
below the lower setpoint, then the lamp is turned ON. As a result, the temperature
sensor is instructed to begin heating. When the temperature rises above the
upper setpoint, the Lamp is turned OFF and the fan is turned ON. As a result, the
temperature sensor is instructed to begin cooling. Various enhancements can be
added to this basic process control loop, such as the delivery of the ambient tem-
perature to the LCD display, allowing use of the switches to program different
modes of operation or adjust the setpoints, or even the ability to force failure
modes where the temperature is allowed to exceed a setpoint.
The Java
Thermostat Application Note (AN0104) discusses an Internet-enabled
HVAC simulation system using the eZ80190 device, and is supported by source
code
1
. This system offers the ability to perform the above functions in addition to
Table 3. Application Module Device Information
Device Manufacturer Part Number I
2
C Device Address
LCD Display Optrex DMC16249B —
I
2
C Temp. Sensor Maxim MAX6625 90h
I
2
C EEPROM Atmel AT24C128 A2h
Flash Memory Micron MT28F008B —
Caution:
Caution:
Note:
Product User Guide PUG001402-0103 Sample Software Project
ZiLOG Development Platforms
Thermostat Application Module Kit
9
supporting a graphical user interface accessible via any Internet browser. It also
supplies automatic email generation in the event of an over-temperature failure
condition. Be sure to periodically check the ZiLOG website
for other Application
Notes featuring the Thermostat Application module.
1. There are two source code files: AN0104-SC01.zip and AN0104-SC02.zip.
Product User Guide PUG001402-0103 Schematic Diagrams
ZiLOG Development Platforms
Thermostat Application Module
10
Schematic Diagrams
Figures 3 and 4 diagram the layout of the Thermostat Application Module.
Figure 3. Thermostat Application Module Schematic Diagram, Top View
/WR
DB1
FNC
DB6
RS
DB2
DB3
DB0
DB7
Gnd
Vcc
/RD
DB4
DB5
Lamp
LED3
SW1
SW2
SW3
LED2
LED1
9 VDC 500ma
2.1 MM CENTER PIN
+
PD6
PD7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
Connects to eZ80 eval board 60 pin header (J6)
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
PA1
PA2
PA3
PA4
PA5
PA6
PA7
Gnd
Gnd
Gnd
Gnd
Gnd
Halogen Lamp
12V 5W Bi-Pin
0.9" long
(w/o pins)
Fan
PD4
PD0
PD1
ID0
9VDC
SCL
SDA
MB_SCL
MB_SDA
HW_SCL
HW_SDA
I2C!Select
SW_SCL
GND
SW_SDA
MB_SCL
MB_SCL
MB_SDA
MB_SDA
SCL
SDA
P_UP1
P_UP2 P_UP3
P_UP4
P_UP2
P_UP1
P_UP3
P_UP4
VCC
VCC
VCC
C5
0.1ufd
Q1
2N2222/SOT23
U9B
4 3
U9A
2 1
U9D
74C906M
8 9
S1
12
R21
10k
R9
180
R20
100
R19
OPEN
U9F
74C906M
12 13
C6
0.1ufd
R6
10K
DS1
LAMP
1
2
R12
OPEN
R15
10K
C2
0.1ufd
U9C
74C906M
6 5
J4
VFD/LCD!DISPLAY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
S2
12
U1
MAX6625
1
2
3
6
5
4
SDA
GND
SCL
Vs
ADD
OT
J9
9V!External
1 2
12
R17
100
R3
1K
Q2
TIP120/TO-220
R7
10K
R22
10k
R5
10K
R10
180
R1
10K!POT
1
2
3
R23
10k
S3
12
R2
1K
J1
DC!PWR!JACK
2
3
1
C1
33uF!15V
+
-
FAN1
1.0"sq!x!0.4"thick
R8
10K
R24
10k
D2
RED
D3
GRN
J6
HEADER!30X2
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
57 58
59 60
C4
0.1ufd
R16
100
C3
33uF!10V
R11
180
U3
74HCT4052/SO
12
14
15
11
1
5
2
4
6
10
9
13
3
16
7
X0
X1
X2
X3
Y0
Y1
Y2
Y3
EN
A
B
X
Y
VDD
VEE
J7
I2C!LCD!DISPLAY
1
2
3
4
U9E
74C906M
10 11
R18
OPEN
R25
10k
R4
10K
U2
AT24C128
1
2
4 5
6
7
8
A0
A1
GND SDA
SCL
WP
VCC
D4
YEL
Product User Guide PUG001402-0103 Schematic Diagrams
ZiLOG Development Platforms
Thermostat Application Module
11
Figure 4. Thermostat Application Module Schematic Diagram, Bottom View
Connects to eZ80 eval board 60 pin header (J8)
GND
D4
D3
D1
GND
A11
A2
A3
A0
GND
D5
GND
-WR
A9
GND
D3
A6
D0
A10
A1
A21
A13
A8
VDD
A21
A15
VDD
A18
A2
GND
-RD
A0
A13
D6
D2
A17
A9
GND
A16
A14
A7
A15
D5A5
A14
A10
-BRESET
A20
A12
-CS3
GND
A4
GNDA8
VDD
D7
-WR
A7
A1
-RD
A11
A6
D4
D0
A5
D7
D2
A19
A16
A4
-BRESET
A19
GND
A17
VDD
GND
D6
A18
D1
A20
GND
A3
A12
-CS2
-CS3
-CS2
VCC
VDD
J10
CS!SELECT
1
2
3
J5
WRITE_PROTECT
1 2
12
U5
SN74CBT3384ADW
3
4
7
8
11
14
17
18
21
22
2
5
6
9
10
15
16
19
20
23
1
13
24
12
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
BE1
BE2
VCC
GND
DIODE
D5
21
U4
MT28F008B
21
20
19
18
17
16
15
14
8
7
36
6
5
25
26
27
28
32
33
34
35
4
3
2
1
40
13
37
38
22
24 23
39
30
31
29
9
12
10
11
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
A13
A14
A15
A16
A17
A18
A19
A20
CE
OE VSS0
VSS1
VDD1
VDD0
A21
WE
WP
RP
VPP
C8
0.1
J8
Header!30x2
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50
51 52
53 54
55 56
57 58
59 60
R13
2.2K
C7
0.1uF
C9
0.1
R14
10K
Product User Guide PUG001402-0103 Thermostat Application Module
ZiLOG Development Platforms
Thermostat Application Module
12
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exists, or to request copies of publications, contact:
ZiLOG Worldwide Headquarters
532 Race Street
San Jose, CA 95126
Telephone: 408.558.8500
Fax: 408.558.8300
www
.ZiLOG.com
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technology described is intended to suggest possible uses and may be superseded. ZiLOG, INC. DOES NOT
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