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ALD523DPH Datasheet(PDF) 3 Page - Advanced Linear Devices |
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ALD523DPH Datasheet(HTML) 3 Page - Advanced Linear Devices |
3 / 20 page © © © © 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 3 of 20 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 mode- A 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 (mode- C). In the single operating mode, ALD523D operates in one of the three modes of operation, either mode-A, mode- B or mode-C. In the multiple operating modes, the ALD523D can operate interchangeably in each of the three |
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