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ALD523DSH Datasheet(PDF) 7 Page - Advanced Linear Devices |
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ALD523DSH Datasheet(HTML) 7 Page - Advanced Linear Devices |
7 / 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 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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