ald523d Advanced Linear Devices Inc (ALD), ald523d Datasheet - Page 4

• Manufacturer Part Number: ald523d
• Description: Multifunction 7-digit Serial Input Display Module Controller
• Manufacturer: Advanced Linear Devices Inc (ALD)

different operating modes. This feature becomes useful
for applications that require multiple modes of operations
where up to three different types of measurements are
made and displayed.
I. CALIBRATED REFERENCE MODE (MODE-A)
The calibrated reference mode (mode-A) is primarily
intended for measurements against a calibrated reference
voltage. The reference voltage can either be internal or
external. In this mode, the ALD523D runs its internal
analog-to-digital controller to manage data conversion
from an analog-to-digital converter chip with calibrated
reference voltage such as the integrating dual slope
precision analog processors ALD500R.
practical applications of utilizing this mode of operation is
a precision digital voltmeter system design (see the
Application Design Note-AN523DA).
In this mode, ALD500 can also be used instead of the
ALD500R, with an external voltage reference. The block
diagram of mode-A is shown in figure 1. See ALD523D
pin configuration and identification section for mode-A
pin layout and description.
II. RATIOMETRIC MODE (MODE-B)
The ratiometric mode (mode-B) is primarily intended for
measurements against a ratiometric reference voltage. In
this mode, the ALD523D runs its internal analog-to-digital
controller to manage data conversion from an analog-to-
digital converter chip such as the integrating dual slope
precision analog processors ALD500 with ratiometric
reference voltage.
applications of utilizing this mode of operation is a
precision weigh scale system design (see the Application
Design Note-AN523DB). The block diagram of mode-B
ALD523D
EEPROM
ALD500R
ANALOG
INPUT
© © © © 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: [phone], Fax: [phone]
Figure 1. Calibrated reference mode (mode-A) block
1K
diagram.
12/01
FUNCTIONS
SELECTORS
One of the practical example
ALD523D
One of the
CHARACTER
DISPLAY
MODULE
(2-LINES)
(1-LINE)
OR
http://www.aldinc.com
(SERIAL DATA)
INSTRUMENT
is shown in figure 2. See ALD523D pin configuration and
identification section for mode-B pin layout and
description.
III. DISPLAY ONLY MODE (MODE-C)
The display only mode (mode-C) is primarily intended for
receiving a ready external serial binary data, converting
and processing the data, and showing the processed data
on the CDM. In this mode, the ALD523D runs its internal
display controller to manage, process, and display the
received serial binary data from a transmitting instrument
or device. One of the applications of utilizing this mode of
operation is an external interface to ALD MB1S precision
digital voltmeter system. The block diagram of mode-C is
shown in figure 3. See ALD523D pin configuration and
identification section for mode-C pin layout and
description.
EXTERNAL
ANALOG
EEPROM
ALD500
INPUT
Figure 3. Display only mode (mode-C) block diagram.
Figure 2. Ratiometric mode (mode-B) block diagram.
1K
EEPROM
1K
FUNCTIONS
SELECTORS
ALD523D
FUNCTIONS
SELECTORS
ALD523D
CHARACTER
MODULE
(2-LINES)
DISPLAY
CHARACTER
(1-LINE)
DISPLAY
MODULE
(2-LINES)
(1-LINE)
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OR
OR