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Part: ALD523DPH
Category:
Description: 7-Digits Serial Input Display Controller
Company: Advanced Linear Devices
Datasheet: Download ALD523DPH datasheet File size : 445 kB
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ALD523D MULTIFUNCTION 7-DIGIT SERIAL INPUT DISPLAY MODULE CONTROLLER
DUAL SLOPE A/D 4-PHASE CONTROLLER
ALD500
CONTROL LOGIC
FUNCTIONS SELECTORS
ANALOG INPUT
SERIAL BINARY TO 6½ -DIGIT DECIMAL CONVERTER DISPLAY MODULE CONTROLLER
CHARACTER DISPLAY MODULE
EXTERNAL SERIAL BINARY INPUT
SERIAL I/O INTERFACE LOGIC
EEPROM MEMORY CONTROLLER
EEPROM
PC ALD523D BLOCK DIAGRAM
PRODUCT FEATURES AND BENEFITS
Up to 7 full digit plus sign (± 9999999) display Built-in 21 bit serial binary to ± 6½ digit decimal converter Compatible with industry standard 1-line x 16 and 2-line x 16 Character Display Modules User defined 16-alphanumeric character TITLE field and up to three 8-alphanumeric character UNIT fields Wide range of alphanumeric display characters Functional with either LCD or VFD display modules with column drivers Designed to operate optionally with ALD500/ALD500R Precision Analog Signal Processors or directly with serial inputs User selected integration time and conversion speed Cost effective and multipurpose stand alone operation 3 optional modes of operation: - Mode A, calibrated reference mode - Mode B, ratiometric mode - Mode C, display only mode Support external serial binary input (up to 32 bits) 3-wire serial interface to microprocessors or microcontrollers Electrical programmable memory interface Crystal oscillator frequency up to 8 MHz Single 3V to 5V power supply Up to 3 separate sets of 7-DIGIT Display Sets 3 sets of user defined 64-bit arithmetic multiplication factor Software programmable serial data bit mask and sign polarity mask 3 different sets of user selected data sample averaging with up to maximum of 128X sampling Optional 13-function user configurable hardware selection switches Automatic zero level shifting during power-on-reset Automatic zero level overwrite feature Adjustable decimal point placement with trailing digit blanking External 1K EEPROM memory for easy change of factory settings Sleep mode with Auto Power-On-Reset. Easy setup of calibration and system setup parameters No software programming required PC Interface Software provided for Calibration and Setup modes
ALD523D
© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 12/01 http://www.aldinc.com 1 of 20
PRODUCT APPLICATIONS Embedded (up to ± 6½ -digit) digital panel meter Customized/specialized instrument display High precision DC voltage meters Dedicated precision monitors High resolution A/D converter with display High accuracy and low noise weigh scale systems Multifunction precision measurement instruments Serial binary input to decimal/character display converter Portable battery operated display systems.
PRODUCT ORDERING INFORMATION
OPERATING TEMPERATURE RANGE* 0oC to +70oC 28-Pin Plastic DIP Package (PDIP) 0oC to +70oC 28-Pin Small Outline Package (SOIC)
ALD523DPH
ALD523DSH
*: Contact factory for industrial temperature range
ALD523D PIN CONFIGURATIONS CALIBRATED REFERENCE (MODE-A)
ALD523D
1 COUT 2 SDA 3 S1/SCL 4 B1/D4 5 B2/D5 6 DSA1/D6 7 DSA2/D7 + 8V 9 XTAL2 10 XTAL1 11 COUT 12 CAL 13 P W R C S 14 CS PH, SH PACKAGE S 3 / R S 28 S 2 / E N 27 DATOUT 26 SCLK 25 DATIN 24 D E C 2 / D 3 23 DGND 22 D E C 1 / D 2 21 SEL1/D1 2 0 S E L 0 / D 0 19 DVCS 1 8 A 17 W P 16 B 15 1 2 SDA 3 S1/SCL 4 B1/D4 5 B2/D5 6 DSA1/D6 7 DSA2/D7 + 8V 9 XTAL2 10 XTAL1 11 COUT 12 CAL 13 P W R C S 14 CS PH, SH PACKAGE COUT
RATIOMETRIC (MODE-B)
ALD523D
S3/RS S2/EN DATOUT SCLK DATIN Z/D3 DGND 28 27 26 25 24 23
22 21 M/D2 S E L 1 / D 1 20 S E L 0 / D 0 19 D V C S 18 A 17 W P 16 B 15
DISPLAY ONLY (MODE-C)
ALD523D
1 N/C 2 SDA 3 SCL 4 B1/D4 5 B2/D5 6 DSA1/D6 7 DSA2/D7 8 V+ 9 XTAL2 10 XTAL1 11 N/C 12 CAL 13 P W R C S 14 N/C RS EN DATOUT SCLK DATIN DEC2/D3 DGND 28 27 26 25 24
23 22 21 DEC1/D2 S E L 1 / D 1 20 S E L 0 / D 0 19 DVCS 1 8 N/C 17 W P 16 N/C 15
PH, SH PACKAGE © 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 12/01 http://www.aldinc.com 2 of 20
ALD523D
GENERAL DESCRIPTION The ALD523D is a Multifunction 7-Digit Serial Input Display Module Controller designed to interface directly to ALD500 or ALD500R integrating dual slope precision analog processors as a chip set for building a high precision and high accuracy analog-to-digital converter system with auto zero and auto-polarity. The ALD523D also functions as an universal serial input 7-digit display module controller that interfaces to most popular industry standard serial data formats from other microprocessors or data converters. It is designed for easy setting of industry standard Character Display Modules (CDM) such as 1-line by 16-character or 2-line by 16-character LCD or VFD display modules. The ALD523D is an enhanced version of the ALD521D digital controller. The ALD523D functions in three separate operating modes, namely calibrated reference (mode-A), ratiometric (mode-B), and display only (mode-C). The ALD523D digital controller operates as a master display module controller in either a stand-alone mode or in an external microprocessor control mode. In the external microprocessor control mode, the ALD523D can directly interface with a PC under PC software control via a standard parallel printer port. This external control mode is managed by the Serial I/O Interface Logic inside the ALD523D. In the stand-alone mode, the ALD523D makes continuous measurements, and includes all the necessary functions to fully control a CDM. In the stand-alone mode, ALD523D operates in conjunction with a 1K EEPROM chip to preserve the setup parameters and arithmetic (calibration) parameters of the ALD523D. The setup and arithmetic parameters are uploaded to the EEPROM via ALD523D Setup and Calibration PC software (DVM523). The ALD523D communicates to the EEPROM on a handshake protocol governed by the EEPROM Memory Controller inside the ALD523D. The ALD500/ALD500R dual slope precision analog processors consist of on-chip digital control circuitry to accept control inputs, integrating buffer amplifiers, analog switches, and voltage comparators. It functions in four operating phases, namely auto zero, integrate, de-integrate, and integrator zero phases. At the end of a conversion, the comparator output goes from high to low when the integrator crosses zero during de-integration. ALD500/ALD500R dual slope precision analog processors also provide direct logic interface to ALD523D. The ALD523D implements the logic and timing for all the four phases of the ALD500/ALD500R, namely auto zero, integrate, de-integrate, and integrator zero phases in modeA and mode-B operations. These four phases are governed by the Dual Slope A/D 4-Phase Controller inside the ALD523D. The ALD523D operates from an external clock or its internal oscillator circuit along with an external crystal. The internal system clock of the ALD523D runs at a frequency which can be selected at divide-by N (4, 8, or 64) rate of the crystal (or external) clock frequency. The ALD523D offers up to 3 display settings, known as display sets, namely "DGS1", "DGS2" and "DGS3". "DGS1" also has an optional hardware decimal point setting mode, known as "DGS0", which allows the user to use hardware jumper switches to set decimal point position. Each display set allows a full 7-digit decimal number to be converted from a 16-bit to 32-bit serial binary number using the Serial Binary To 6½-Digit Decimal Converter inside the ALD523D. This 6½-digit decimal number can also be scaled by a MULTIPLIER number, and the result of the scaled number displayed on the CDM through the Display Module Controller within the ALD523D. Additional display parameters that can be manipulated are: Digit Blanking, which allows user selection of number of digits to display; Decimal Point placement, which controls placement of decimal point, if any. Up to 3 sets of display UNIT fields are available, each with a combination of alphanumeric characters up to 8 characters long. The ALD523D also features hardware control-input pins for power down (PWRCS), integration time selection (S1, S2 and S3), data sample averaging (DSA1 and DSA2), digit blanking (B1 and B2), decimal point placement (DEC1 and DEC2), zero offset (M and Z), and display set selection (SEL0 and SEL1). When not used, or if no control is desired, each of these optional pins are wired to their respective desired logic state, either V+ or Ground (DGND), through pull-up or pull-down resistors. The functions of the control-input pins are managed by the Control Logic section in the ALD523D. MODES OF OPERATIONS The ALD523D functions in either single operating mode or multiple operating modes, namely calibrated reference (mode-A), ratiometric (mode-B), and display only (modeC). In the single operating mode, ALD523D operates in one of the three modes of operation, either mode-A, modeB or mode-C. In the multiple operating modes, the ALD523D can operate interchangeably in each of the three
ALD523D
© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 12/01 http://www.aldinc.com 3 of 20
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. One of the 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.
1K EEPROM CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES)
is shown in figure 2. See ALD523D pin configuration and identification section for mode-B pin layout and description.
1K EEPROM CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES)
ALD523D
ALD500
ANALOG INPUT
FUNCTIONS SELECTORS
Figure 2. Ratiometric mode (mode-B) block diagram.
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.
1K EEPROM
ALD523D
ALD500R
ANALOG INPUT
FUNCTIONS SELECTORS
Figure 1. Calibrated reference mode (mode-A) block diagram.
EXTERNAL INSTRUMENT (SERIAL DATA)
ALD523D
CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES)
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-todigital converter chip such as the integrating dual slope precision analog processors ALD500 with ratiometric reference voltage. One of the practical example 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
FUNCTIONS SELECTORS
Figure 3. Display only mode (mode-C) block diagram.
© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 12/01 http://www.aldinc.com 4 of 20
ALD523 SETUP AND CALIBRATION SOFTWARE In the stand-alone mode, ALD523D operates in conjunction with a 1K EEPROM chip to preserve the setup and arithmetic (calibration) parameters of the ALD523D. These parameters are utilized to fully control the CDM and measurement functions. The parameters are preset by the user through the ALD523D Setup and Calibration PC software known as DVM523.EXE, and later uploaded to the EEPROM via a standard parallel printer port. See the ALD523D Setup and Calibration User Guide (DVM523) for more details. SELECTING AND CONFIGURING MODES OF OPERATIONS The three ALD523D modes of operations, namely modeA, mode-B, and mode-C are configured in the .CDS file (see Table 1 of the ALD523D Setup and Calibration Software User Guide), and are selected by means of user selection of SEL0 and SEL1 control inputs of the ALD523D. Each display set "DGSx" has an associated mode parameter "Mx" which specifies the mode of operation. Hence, "DGS1", "DGS2", and "DGS3" have 3 associated mode specifying parameters "M1", "M2", and "M3", respectively. Each "Mx" parameter can be preset to either "Mode-A", "Mode-B", or "Mode-C". I. CALIBRATED REFERENCE MODE (MODE-A) Mode-A can be selected by setting the nibble "M1" parameter, or "M2" or "M3" of the byte "M2-M3" parameter to an "A" (HEX) in the .CDS file. "M1", "M2", and "M3" are the mode selection parameters associated with "DGS1", "DGS2", and "DGS3" display sets, respectively. In mode-A or mode-B operation, the bit masking "SMSK1" to "SMSK4" and the polarity bit masking "SMSK5" to "SMSK8" parameters are not utilized. However, this mode transmits a 24-bit serial word on pin 26, DATOUT. This 24-bit serial word consists of 23-bit binary data with MSB as the first bit, LSB the 23rd bit, followed by a sign bit as the last bit. The sign bit is a logical "1" as a positive sign, and logical "0" as a negative sign. II. RATIOMETRIC MODE (MODE-B) Mode-B can be selected by setting the nibble "M1" parameter, or "M2" or "M3" of the byte "M2-M3" parameter to an "B" (HEX) in the .CDS file.
When the ALD523D is powered up the first time or after power-on-reset, a zero correction is automatically set by zeroing out the reading. This automatic zero correction feature can be manually overwritten by the Z switch (see Table 5) at any time. The overwrite feature is embedded to eliminate the long wait time at long integration time, and add flexibility to perform zero correction at any time. However, the faster the integration time set, the less the wait time is needed to perform the automatic zero correction (i.e. it takes typically from about 1 to 14 seconds to automatically zero out a reading for integration time of 16.66 ms to 300 ms, respectively). III. DISPLAY ONLY MODE (MODE-C) Mode-C can be selected by setting the nibble "M1" parameter, or "M2" or "M3" of the byte "M2-M3" parameter to an "C" (HEX) in the .CDS file. In mode-C operation, switches "S1", "S2", and "S3" are internally disabled. In mode-C operation, the ALD523D receives a maximum serial word length of 32 bits in accordance to 32 serial clock pulses, and processes a maximum of 21-bit serial word plus 1 sign bit within this 32-bit serial word. This 21-bit serial word can be any 21-bit consecutive serial data stream segment within the 32-bit serial clocks, as selected by programming of the bit masks "SMSK1" through "SMSK4". The length of the received serial word is governed by a DVCS signal. A transition of DVCS from high to low state signals the start of the serial input data bit stream clocking. A transition of DVCS from low to high state stops the serial input data bit stream clocking. After an external instrument or processor sets the DVCS to logic 0, the DATIN terminal of the ALD523D is ready for serial input data stream. The ALD523D reads the first bit of the serial input data stream on DATIN and sends a serial clock pulse on the SCLK as an acknowledge signal to the external instrument or processor. Then the ALD523D reads the second bit of the serial input data stream and sends out a second SCLK clock pulse. This serial data reading and clocking process continues until DVCS is set to high state or until a maximum of 32 serial input data bits have been read. The serial clock SCLK consists of a low to high transition followed by a high to low transition. The maximum converted decimal number from this 21-bit binary data plus sign bit is ± 9999999, when a suitable multiplier and an appropriate conversion factor are used. The sign bit is defined as logic "0" as a positive sign, and logic "1" as a negative sign. Alternatively, the sign bit
ALD523D
© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 12/01 http://www.aldinc.com 5 of 20
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