APPLICATION NOTE Decimal Point Drivers most common technique

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APPLICATION NOTE Decimal Point Drivers most common technique

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APPLICATION NOTE
Decimal Point Drivers
most common technique activating single decimal point simply tieing activation ground. most situations, only decimal point used because display reading represents only parameter. However, some applications require more than decimal point order indicate different range, perhaps, have reading represent some other system parameter. simple rotary switch used with meter when more different decimal point selections required. rotary switch method illustrated Figure Other components that used decimal point drivers, particularly when dynamic control required, CMOScompatible logic gates/buffers open-collector/open-drain discrete transistors. maximum current driving device must sink 20mA (see individual product data sheets more specific data). following diagrams illustrate various techniques that used driving decimal points Series meters.
DMS-30PC
DMS-30PC
74LS04
(ON) (OFF)
Figure Simple selector switch used with Series panel meters.
Figure Inverting gate decimal point drivers usable with 5V-powered digit panel meters except models with blue displays.
DMS-40LCD-X/X-5
DMS-30PC
(ON)
4.7k
Q1-Q3 2N2222
(OFF)
4.7k (ON) (OFF) 4.7k
74LS04
Figure transistors used with 5V-powered, digit, panel meters.
Figure Inverting gate decimal point drivers usable with 5V-powered digit DMS-40PC-X-RL (low-power LED's) panel meters.
DATEL, Inc., Mansfield, 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: sales@datel.com Internet: www.datel.com
DATEL makes representation that products circuits described herein, other technical information contained herein, will infringe upon existing future patent rights. descriptions contained herein imply granting licenses make, use, sell equipment constructed accordance therewith. Specifications subject change without notice. DATEL logo registered DATEL, Inc. trademark.

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