Ise Electronics Corp

Back to APN140 INDEX

BD VFDs Application Note APN140

6. RELIABILITY TEST CONDITIONS

Basically the BD VFD is subjected to the same reliability test standards "TT-90-3050A" as the conventional VFDs. For details on the test conditions, refer to Vacuum Fluorescent Display Application Note APN1O1.

7. PRECAUTIONS ON THE HANDLING

  1. Because the BD VFD contains C-MOS chips, please be cautious of electrostatic discharge failure-Unpacking of the BD VFD from the packing tray, mounting or soldering to the PCBs should be conducted in an environment provided with anti-static measures.
  2. When the SO and GSO terminals are not used, please leave them open.
  3. Some types of BD VFDs may come equipped with terminals of same designation. Those terminals with the same designation should all be connected in parallel.
  4. Be careful not to apply the display supply vantage (VDD2) without the logic supply voltage (VDD1). Please refer to the power supply sequence in this application note or individual specification.
  5. Insert a noise filtering capacitor between "VDD1 "-"VSS".
  6. When power on the VFD, during a period of sending the first screen data, all of BK should be H.

9. WORD IN SPECIFICATION

Spec. No.
The "Spec No." shows a revision number of the specification sheet. Each documented specification carries an area of revision history in upper right corner of the top page. The specifications of the standard models are subject to without prior notice. So, please check if the revision number of your specification is the latest version before evaluating it.

Absolute Maximum Ratings
An "Absolute Maximum Ratings" refers to a value that must not be exceeded in any event. The VFD must not be used in excess of the value specified under this item. Use of a VFD in excess of the specified rating may lead to its permanent breakdown. Therefore, high reliability will be secured if special attention is paid to the design of a power supply circuit, possible fluctuations in the supply voltage, surrounding components, operating temperature, environment surges or spikes, etc.

Rating or Recommended Operating Conditions
A "Rating" or "Recommended Operating Conditions" represents the specification of a recommended operating condition that guarantees the operation of a VFD. It also serves as a test condition for which the product is subjected prior to shipment from the factory. Therefore, it should be noted that if a VFD is used in excess of the maximum or minimum rating specified here, its operation and quality will not generally be guaranteed even when such raft remains within the absolute maximum rating.
In addition, this rated value has been defined assuming the most standard service conditions by the users. However, some mm may want to study the possibility of using the VFDs outside the rated value, prompted by a desired individual requirement. In such a case,; please feel free to call suit with us, as we may be willing to discuss the possibility of the proposed specifications.

Block Diagram
It shows how to connect the power supplies. The basic circuit in the factory inspection is the same as this one.

Electrical (and Optical) Characteristics
All of numbers specified in this section shows the characteristics when the BD VFDs are tested under the typical (TYP) operating conditions unless otherwise noted.

Timing Chart
It shows an AC characteristics and relationship of interface operations.

Serial Data Format
It shows a shift register and segment or grid assignment, and how to control these data to make optimum grid scan.

Back to APN140 INDEX   Application Notes Index
APN140