BD VFDs Application Note APN140

4. CONTROL PROCEDURE

4.1 Static Drive Type

In a static driven BD VFD, each input data bit of the shift register in the drivers is assigned to an anode segment on a one-on-one basis. The relevant assignment order is explained in "Serial Data Format" or "Shift-Register Segment Assignment" on the individual specification. Each segment is controlled by switching on or off the assigned bit by sending data as "High" or "Low". Since the drivers have data latching capacity, the content is kept until it is latched again. For example, during this period, if the data is "High", the corresponding segment stays turned on in the static drive.

Note: Please refer to the individual specification for the shift register and segment assignment. In case of a custom-designed VFD, the number of data bits, segment assigning order, and other particulars will be determined through discussion with the customer.

Fig.15 Example of Static Drive