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ALD523DSH Datasheet(PDF) 7 Page - Advanced Linear Devices

Part # ALD523DSH
Description  MULTIFUNCTION 7 - DIGIT SERIAL INPUT DISPLAY MODULE CONTROLLER
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Manufacturer  ALD [Advanced Linear Devices]
Direct Link  http://www.aldinc.com
Logo ALD - Advanced Linear Devices

ALD523DSH Datasheet(HTML) 7 Page - Advanced Linear Devices

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©
©
©
© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286
ALD523D
12/01
http://www.aldinc.com
7 of 20
Figure 4. Programmable input frequency divider of the
clock source.
The 4-bit hexadecimal number defines the selection of
either 1-line x 16-character or 2-line x 16-character
display, along with the operating frequency modes (low or
high) and the input frequency dividers of 4, 8, and 64,
respectively. The low or high frequency mode operates
the ALD523D in the low emission mode or standard
mode, respectively. The input frequency divider further
scales down the input clock source from a divide by 4 by
any integer number of 1, 2, and 16 as illustrated in figure
4.
SELECTING AND CONFIGURING DISPLAY
TITLE LINE
With the ALD523D, one 16-character display TITLE line
field can be custom programmed according to user’s
choices, and displayed on the first line of the 2-line by 16-
character CDM. The characters of this TITLE line field is
configured through “TTL1” to “TTL16” parameters,
which are 16-byte hexadecimal numbers located on the
second and third lines of the .CDS file, and corresponds to
addresses from 08H to 17H of the EEPROM memory
address map (see Table 3 character codes and patterns in
the ALD523D Setup and Calibration Software User
Guide). TITLE line field is not displayed when 1-line by
16-character display is used.
DATA & UNIT DISPLAY LINE
The first line of the 1-line x 16-character or the second line
of the 2-line x 16-character CDM is divided into a DATA
field and a UNIT field, as illustrated in figure 5. The
ALD523D converts a 24-bit plus sign bit serial data stream
to a 7-digit decimal number with +/- sign. The 7-digit
number, when displayed with +/- sign and a decimal point,
takes up a total of 9 characters. This 7-digit number is
displayed in the DATA field starting on the first character
of a 1-line CDM and starting on the first character of the
second line of a 2-line CDM.
Figure 5. Character Display Module TITLE, DATA, and
UNIT fields.
The remaining characters of the 16-character line of the
CDM are used as UNIT character displays. The user can
put any combination of characters in the remaining
character fields. In general, these characters are used as a
display of a UNIT of measure, such as “VOLT” or
“KILOGRAM” or “PSI”.
A maximum of 8 characters can be displayed in the UNIT
field. However, if the first character of the UNIT field is a
“blank”, or 20 (HEX), then a full 7 digit plus sign and
decimal point can be displayed.
Otherwise, only a
maximum of 6 digit plus sign and decimal point are
displayed, as the last digit of the 7 digit number is over-
written by the UNIT display character.
For example, using “KILOGRAM” as a UNIT display,
maximum digits displayed are 6 digits. In order to have 7
digits displayed, the UNIT label may be changed to
“_KGM” where the first character of the 8-character UNIT
field is a blank character 20 (HEX).
SETF
SETF
X-TAL
OSC
Or
EXT.
CLOCK
÷÷÷÷ 2
÷÷÷÷ 16
÷÷÷÷ 4
SYSTEM
CLOCK
1-LINE x 16-CHARACTER CDM
2-LINE x 16-CHARACTER CDM
TITLE LINE FIELD
DATA FIELD
UNIT FIELD
DATA FIELD
UNIT FIELD


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