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| • |
Vertical Stacking Capability |
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| • |
Single 5Vdc Power Required |
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| • |
Standard ASCII Character Codes |
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| • |
5 X 7 Dot Matrix Character Font |
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| • |
Bezel and Filter Available |
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Medical Instrumentation |
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| • |
Energy Management Systems |
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| • |
Process Control Equipment |
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Remote Alert Status Indicators |
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Industrial Robot Controllers |
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The SM-810-004 is a 20 character, 5 x 7 Dot Matrix, Gas Discharge Display System. Screened Image Planar Technology affords this display excellent brightness and a wide viewing angle.
The SM-810-004 system is a complete display system. The key element is a control microcomputer which accomplishes the functions of character memory, display refresh multiplexing and host system interface. This system also includes a DC to DC converter to generate the required display voltages.
The host interface consists of an 8 bit bi-directional data bus for transfer of data and control information, SIX control lines and two lines for the 5 volt input. Three commanded data entry modes are available to the host:
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| • |
Left-to-right (typewriter) |
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| • |
Right-to-left scroll (calculator) |
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| • |
Random (character position codes are preselected) |
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A resident self test routine is accessed by activating a control line. When active, the self test routine scrolls the complete set of 98 characters at a rate of approximately four characters per second.
Brightness control permits the display intensity to be varied. Character or block blinking (for emphasis) and display blanking are accessed via control words over the data bus to the system. The system is reset automatically upon application of power. A reset line is also available to the host system to perform the reset function at will.
Data or control information is written to the SM-810-004 system by taking the address line (CS*) to the active low state, applying the desired 8 bit data word to the data bus, and pulsing the write strobe (WR*) to the active low state. Status information (busy or ready) is read from the data bus by taking the read strobe (RD*) to the active low state.
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Figure 1. System Block Diagram |
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Parallel Input Systems
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The SM-810-004 display system receives ASCII parallel character data or control word inputs over an 8-bit data bus. The parallel input is accomplished via the data bus and CS* (address) and WR* (Write Strobe) control lines (See Figure 6). The system verifies that the incoming data is valid ASCII code before executing any function. If an invalid code is received, the system disregards the input.
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Character Entry Modes
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Character data may be entered in three modes: left-to-right, right-to-left scroll, or random. The automatic "power-on reset" places the display system in the left-to-right character entry mode. Characters entered in the Left-to-Right mode appear in sequential left-to-right character locations. One can enter this mode, from another character entry mode, by sending a "CARRIAGE RETURN" (0DH) or an "INITIALIZE" (09H) control word (See Table 3) from the host computer. Left-to-right entry is also selected after the "RESET" control line has been activated.
The "SCROLL" control word (0CH) sets the character entry mode to Right-to-Left scroll. Character data entered following this command will be displayed at the far right position. Existing characters will move left one position as each new character is entered. This mode is used for right-to-left scrolling messages, and is especially useful for messages longer than the display.
Characters may be entered randomly if the system is in the left-to-right entry mode. Random character entry is accomplished by sending a "POSITION POINTER" control word (See Table 3) which specifies the location of the next character to be entered. Successive characters will appear in sequential left-to-right character locations unless another "POSITION POINTER" control word is sent. The user can exit the random entry mode by sending a "CARRIAGE RETURN," "INITIALIZE," or "SCROLL" control word to specify left-to-right or right-to-left character entry modes.
Character data or control words (Tables 3 & 5) may only be entered into the display system when it is ready. This can be determined by reading the status bit.
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Table 1. Power Connector (J2) Pin Assignments
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Function
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Pin No.
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Pin Label
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Ground
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J2-1
|
GND
|
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+5 Volts dc
lnput(VCC)
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J2-2
|
+5V
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Brightness Control
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J2-3
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BC
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Table 2. Data Connector (J1) Pin Assignments
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Pin #
|
Symbol
|
Direction
|
Name
|
Function
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JI-1
|
GND
|
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Signal Ground
|
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JI-2
|
DB0
|
Input/Output (I/O)
|
Data Bit 0
|
LEAST significant data bit
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JI-3
|
GND
|
|
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JI-4
|
(DB1)
|
I/O
|
Data Bit 1
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JI-5
|
GND
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JI-6
|
DB2
|
I/O
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Data Bit 2
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JI-7
|
GND
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JI-8
|
DB3
|
I/O
|
Data Bit 3
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JI-9
|
GND
|
|
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JI-10
|
DB4
|
I/O
|
Data Bit 4
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JI-1 1
|
GND
|
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JI-12
|
DB5
|
I/O
|
Data Bit 5
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J1-13
|
GND
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JI-14
|
DB6
|
I/O
|
Data Bit 6
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JI-1 5
|
GND
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JI-16
|
DB7
|
I/O
|
Data Sit 7
|
MOST significant data bit
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JI-1 7
|
GND
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JI-18
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T0*
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Input
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Self Test
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Places unit into self-test mode
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JI-19
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GND
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JI-20
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RST*
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Input
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Reset
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Performs a "Hardware Reset"
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JI-21
|
GND
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JI-22
|
CS*
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Input
|
Chip Select
|
Must be present to allow data to be input or output from a subsystem. Its use indicates that this unit has been selected to either read or write data. Must be used with either WR* or RD*.
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JI-23
|
GND
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JI-24
|
RD*
|
Input
|
Read Strobe
|
When pulsed this control signal requests the display subsystem to present its status on the data bus.
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JI-25
|
GND
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|
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JI-26
|
WR*
|
Input
|
Write Strobe
|
When pulsed this control signal requests the Display Subsystem to read the data lines for either character codes or control codes.
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Read Status
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The status of the display system is read by issuing a RD* pulse (Read Strobe) from the host computer while the CS* line is in its active low state (See Figure 7). The status buffer register controls all eight bits of the data bus, although only one bit (DB1) is defined. The status bit (DB1) is " 1" if the input buffer is busy; and, "0" if the input buffer is ready.
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Self Test
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Actuation of the "SELF TEST" control line (T0 in Table 2) places the display system in the Self Test mode. The entire 98-character set is sequentially displayed and scrolled from right-to-left at a rate of approximately 9 characters per second. The routine is terminated by returning T0 to the inactive state. The display retains the characters which were displayed at the time of termination of Self Test.
An "INITIALIZE" control word, or actuation of the "RESET" control line is required after SELF TEST This ensures that all previous control words have been deleted.
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System Reset
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Actuation of the "RESET" control line (RST*) resets the display system as described in Table 2. A "power-on reset" is automatically implemented when power is applied to the system.
Under normal operating conditions, control of this reset line by the host computer is not required. However, transients on the input power lines can disrupt operation of the control microcomputer, thereby necessitating a reset to restore operation. An external reset requires a pulse which is low for at least 50 ms after stabilization of the 5 volt supply input.
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Character Set/Codes
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The internally-generated character set consists of 98 characters: the standard ASCII 96-character set, plus the ° symbol and the Greek letter µ. The character codes and resultant 5 x 7 dot matrix characters are defined in Table 5. Character codes are listed in hexadecimal notation for convenience.
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| |
Control Words
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Control words are hexadecimal codes sent to the display system over the XX bus from the host computer. These codes activate functional features XX have been programmed into the display system.
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Table 3. Control Words (Codes)
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|
Function
|
Hex Code
|
ASCII Code
|
Description
|
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Null
|
00H
|
NUL
|
Clears the display of all characters and sets the location counter (character position pointer) to position 1 if in left-to-right character entry mode, or to the far right position if in the right-to-left character entry mode. Clearing the display deletes all previous entered character codes.
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|
Back Space
|
08H
|
BS
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Decrements the location counter (character position pointer) and clears the character at this new position.
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|
Initialize
|
09H
|
HT
|
Initializes the system by clearing the display of all characters, setting the character entry mode to left-to-right, and setting the location counter (character position pointer) to position 1. All previously entered control codes are also deleted.
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|
Blank
|
0AH
|
LF
|
Blanks the display. All characters and control codes are retained by the system.
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|
Unblank
|
0BH
|
VT
|
Unblanks the display. All characters and control codes entered while display was blanked are displayed.
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Scroll
|
0CH
|
FF
|
Sets the character entry mode to right-to-left scroll. In the scroll mode, characters are entered at the far right position and existing characters move left one position as each new character is entered.
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|
Carriage Return
|
0DH
|
CR
|
Sets the character entry mode to left-to-right and sets the location counter (character position pointer) to position 1.
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|
Blink
|
0EH
|
SO
|
Causes the system to enter the blink mode. This control word is followed by two Blink Address Codes which specify the start and stop locations of the blinking characters within the field of characters. Codes 1 EH through 31H specify locations I through 20 inclusive. The characters begin to blink at a rate of approximately 5Hz after the second Blink Address Code is received. The blink mode is terminated by issuing control word 0EH followed by 46H
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|
Position Pointer
|
9EH-B1H
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Position Pointer Codes, for the random character entry mode, which specify the location of the next character to be entered. Successive characters will appear in sequential left-to-right character locations unless another Position Pointer Code is sent. The hexidecimal codes, at the left, set the location counter (character position pointer) to positions 1 through 20.
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Table 4. Interrupt Times for Data/Control Words
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Word
|
Interrupt Service Time (µS)
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Character Data Word
Left-to-Right Entry
Right-to-Left Entry
SM-810-004
Random Entry
|
100µS
400
100
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|
Control Word
Null
Back Space
Initialize
Blank
Unblank
Scroll
Carriage Return
Blink
Position Pointer
|
468
113
833
85
90
80
80
133
80
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Disregard an Invalid Word
|
100
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Handshaking Entry
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The SM-810-004 provides for direct handshaking of input words by use of the status read feature. In this mode, the readiness of the system to receive a word is examined by the host, thus permitting word entry at the maximum possible rate. Figure 5 is the flow chart for the handshaking word entry process.
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Dynamic Mode Operation
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Some applications may require dynamic mode operation in which all or part of the display information is updated several times per second. The display system performs two basic functions, servicing input requests from the host and refreshing the display information. As the frequency of input requests increases, the refresh rate will decrease and this may result in an undesirable effect upon the display information. This effect can be minimized by updating only the field of the display that is changing, minimizing the frequency, and avoiding control codes. Under normal operating conditions, the display can be updated five times per second without noticeable flicker.
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Brightness Control
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A discrete line, BC, is available to the user at connector J2 for controlling the display brightness. Leaving the BC line open results in full brightness. Grounding the line results in a lower brightness level. The user can vary the display brightness from full to low intensity by controlling this line. In a typical application, the user may need a front panel control which will vary the display brightness to compensate for ambient lighting conditions. This can be implemented by installing a potentiometer at the host equipment front panel. Use of a 5KOhms potentiometer in the manner illustrated in Figure 2 will provide linear brightness control from full to low intensity.
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Figure 2. Linear Brightness Control
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Figure 3. System Reset
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Table 5. Character Code Table
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Hex Code
|
Character
|
Hex Code
|
Character
|
Hex Code
|
Character
|
|
61
|
a
|
41
|
A
|
30
|
0
|
|
62
|
b
|
42
|
B
|
31
|
1
|
|
63
|
c
|
43
|
C
|
32
|
2
|
|
64
|
d
|
44
|
D
|
33
|
3
|
|
65
|
e
|
45
|
E
|
34
|
4
|
|
66
|
f
|
46
|
F
|
35
|
5
|
|
67
|
g
|
47
|
G
|
36
|
6
|
|
68
|
h
|
48
|
H
|
37
|
7
|
|
69
|
I
|
49
|
I
|
38
|
8
|
|
6A
|
j
|
4A
|
J
|
39
|
9
|
|
6B
|
k
|
4B
|
K
|
3A
|
:
|
|
6C
|
l
|
4C
|
L
|
3B
|
;
|
|
6D
|
m
|
4D
|
M
|
3C
|
<
|
|
6E
|
n
|
4E
|
N
|
3D
|
=
|
|
6F
|
o
|
4F
|
O
|
3E
|
>
|
|
70
|
p
|
50
|
P
|
3F
|
?
|
|
71
|
q
|
51
|
Q
|
40
|
@
|
|
72
|
r
|
52
|
R
|
|
|
|
73
|
s
|
53
|
S
|
20
|
space
|
|
74
|
t
|
54
|
T
|
21
|
!
|
|
75
|
u
|
55
|
U
|
22
|
"
|
|
76
|
v
|
56
|
V
|
23
|
#
|
|
77
|
w
|
57
|
W
|
24
|
$
|
|
78
|
x
|
58
|
X
|
25
|
%
|
|
79
|
y
|
59
|
Y
|
26
|
&
|
|
7A
|
z
|
5A
|
Z
|
27
|
|
|
7B
|
{
|
5B
|
[
|
28
|
(
|
|
7C
|
|
|
5C
|
/
|
29
|
)
|
|
7D
|
}
|
5D
|
]
|
2A
|
*
|
|
7E
|
~
|
5E
|
>
|
2B
|
+
|
|
7F
|
delete
|
5F
|
--
|
2C
|
,
|
|
|
|
60
|
/
|
2D
|
__
|
|
|
|
|
|
2E
|
.
|
|
|
|
|
|
2F
|
/
|
|
|
|
|
|
1E
|
°
|
|
|
|
|
|
1F
|
µ
|
|
|
| |
Figure 4. Operating Program Flow Diagram
|
|
|
| |
Figure 5. Handshaking Word Entry Flow Chart
|
|
 |
| |
| |
| |
Table 6. AC Characteristics |
|
|
(VCC = +5 Vdc ± 5%, ± A = 0 to +55°C)
|
| |
Write/Input Parameters
|
|
| |
|
Parameter
|
Symbol
|
Min
|
Unit
|
|
WR* Pulse Period (Without Status Read)
Left-to-Right or Random Character Entry Mode
Right-to-Left Scroll Character Entry Mode
|
tWS
|
100
800
|
µs
µs
|
|
CS* Setup to WR*
|
tAW
|
0
|
ns
|
|
WR* Pulse Width
|
tWW
|
250
|
ns
|
|
CS* Hold After WR*
|
tWA
|
0
|
ns
|
|
Data Setup to WR*
|
tDW
|
150
|
ns
|
|
Data Hold after WR*
|
tWD
|
0
|
ns
|
|
| |
Status Read/Output Parameters
|
|
| |
|
Parameter
|
Symbol
|
Min
|
Max
|
Unit
|
|
CS* Setup to RD*
|
tAR
|
0
|
|
ns
|
|
RD* Pulse Width
|
tRR
|
250
|
|
ns
|
|
CS* Hold after RD*
|
tRA
|
0
|
|
ns
|
|
CS* to Data Out Delay
|
tAD
|
|
225
|
ns
|
|
RD* to Data Out Delay
|
tRD
|
|
225
|
ns
|
|
RD* to Data Float Delay
|
tDF
|
|
100
|
ns
|
|
|
| |
Figure 6. Write/Input Timing Diagram (Subsystem Receiver Timing)
|
|
|
| |
Figure 7. Status Read/Output Timing Diagram (Subsystem Status Timing)
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|
 |
| |
| |
| |
Table 7. DC Characteristics |
|
|
(VCC = + 5Vdc ± 5 %, TA = 0 to + 55°C unless otherwise noted)
|
| |
|
Parameter
|
Symbol
|
Min
|
Max
|
Unit
|
|
Input Low Voltage (Except RST*)
|
VIL
|
-0.5
|
0.8
|
Vdc
|
|
Input Low Voltage (RST*)
|
VIL1
|
-0.5
|
0.6
|
Vdc
|
|
Input High Voltage (Except RST*)
|
VIH
|
2.2
|
VCC
|
Vdc
|
|
Input High Voltage (RST*)
|
VIH1
|
3.8
|
VCC
|
Vd
|
|
Data Bus Input Current
(DB0-DB7)
0.45 Vdc<VIN<VCC
|
IIB
|
|
±10
|
µA
|
|
Input Law-Current
(TO*, CS*, RD*, WR*)
VIL = 0.4 Vdc
|
IIL
|
|
-550
|
µA
|
|
Input Low Current (RST*)
VIL1 = 0.6 Vdc
|
IIL1
|
|
-0.2
|
mA
|
|
Input Low Current (BC*)
VBC = 0.0 Vdc
|
IIL2
|
|
-4.7
|
mA
|
|
Input High Current
(TO*, CS*, RD*, WR*)
VIH = 2.4 Vdc
|
IIH
|
|
-320
|
µA
|
|
Output Low Voltage (Status Bit DB1)
IOL = 2.0 mA
|
VOL
|
|
0.45
|
Vdc
|
|
Output High Voltage (Status Bit DB1)
IOH = 400µA
|
VOH
|
2.4
|
|
Vdc
|
|
Power Supply Input Current
VCC = 5.0 Vdc, TA = 25°C,
20 dots illuminated at all
character positions
*Typical Current
|
ICC
|
1.75*
|
|
A
|
|
Note: Positive currents flow into the display system.
|
| |
| |
| |
Table 8. Maximum Ratings* |
|
|
| |
|
Rating
|
Symbol
|
Value
|
Unit
|
|
Power Supply Voltage
|
VCC
|
4.75 to 5.25
|
Vdc
|
|
Operating Ambient Temperature Range
|
TA
|
0 to +55
|
ºC
|
|
Storage Temperature Range
|
TS
|
-40 to +70
|
°C
|
|
Shock X, Y, Z, axes:
1/2 sinewave, 10 ms pulse duration
|
-
|
20
|
g's
|
|
Vibration (Y axis normal to display;
Z axis is longitudinal to module)
X, Y axes: 0.2 inch DA, 10-14 Hz, 50-100 Hz
Z axis: 10-100 Hz
|
-
-
|
2
2
|
g's
g's
|
|
*Ratings beyond which the usable life of the display system may be reduced.
|
| |
| |
| |
Physical and Mounting Dimensions |
|
|
Figure 8 |
| |
 |
| |
| |
|
|
| |
|
Model Number
|
Description
|
|
SM810-004
|
20-Character display subsystem; 5 x 7 dot matrix; 0.47" character height; parallel interface.
|
|
DB-110
|
Bezel for SM810-004.
|
|
DF-110-001
|
Filter; amber.
|
|
DF-120-001
|
Filter; amber, circular polarized, matte finish.
|
|
DF-120-002
|
Filter; neutral; circular polarized, matte finish.
|
|
DF-120-003
|
Filter; amber; circular polarized, non-matte finish.
|
|
DF-120-004
|
Filter; neutral; circular polarized, non-matte finish.
|
|
| |
| |
|
|
Data connector (J2) mating plug has 26-contacts on 0.100" center, 2-rows, with strain relief for flat cable. May be purchase from:
|
| • |
Bergelex -- P/N 66900-026 |
|
|
or any equivalent plug with the same specifications.
Power connector (J1) mating plug may be purchased from Molex. Specify:
|
| • |
Housing Type -- P/N 09-50-3031 |
|
| • |
Pin Type (18-AWG) -- P/N 08-50-0106 |
|
| |
* Items in bold and with an asterik (e.g. RST*) indicates negative true logic (typically denoted by an overbar).
For further information, contact your local Babcock Representative or the factory.
This document is designed to assist a purchaser to make an independent determination as to the suitability of these products for his application. Therefore, performance under any use conditions must be based upon the purchaser's independent conclusions, and no conclusion, representation or warranty is made or implied as to the suitability of any of these devices for a particular requirement or use, due to the wide variety of possible applications, and/or conditions beyond our control.
Specifications subject to change without notice.
SPECIAL HANDLING INSTRUCTIONS
MOS circuit components in this assembly are susceptible to damage from static electricity and high voltage transients. A shorting pad of conductive foam has been installed across the interface connector. The shorting pad should not be removed until the terminating connector is wired and ready to be connected to the assembly. The interface connector should always be terminated with either the shorting pad or the terminating connector. DO NOT TOUCH the interface connector with fingers or tools in the absence of the shorting pad or the terminating connector unless properly grounded. The data connector should not be connected or disconnected while power is applied to the unit.
LIMITED WARRANTY
All Babcock displays have a one year limited warranty. Disassembly of the product will void the warranty. Damaged displays should be returned to the factory for analysis. Contact the factory for further details.
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Specifications are for reference only.
9200-0033
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