HT16561

DataSheet.in HT16561 VFD Digital Clock Features · VFD display 12 hour clock function · 4.194304MHz crystal oscillation · Zero adjust function · Integrated voltage regulator permits wide 4V to 16V operating voltage range · Four level contrast control function · 44-pin QFP package General Description The HT16561 provides direct drive to VFD panels to implement a 12 hour clock function. In addition to obtaining its time base from a 4.194304MHz crystal oscillation source and in having a wide operating voltage, the device also contains a host of other features. These include a choice of adjustment modes, including single push increment or 2Hz fast forward functions. Additional features are provided in the form of Zero adjustment and four levels of contrast control. Block Diagram C M O S O S C O O s c illa to r O S C I V T E S T 3 T E S T 2 T E S T 1 V D D 6 4 H z F r e q u e n c y D iv id e r s 1 H z 1 H z T e s t A d ju s tm e n t S e c o n d C o u n te r (1 /6 0 ) a 1 D D V D D b 1 M in u te C o u n te r (1 /6 0 ) D e c o d e r S e g m e n t D r iv e r [P C H c 1 T im e A d ju s tm e n t A /C S E Z A M S H S H o u r C o u n te r (1 /1 2 ) D e c o d e r S e g m e n t O p e n D r a in ] A M /P M g 3 b 4 c 4 A M V C O N T 2 C O N T 1 D IM D D C o n tra s t A d ju s tm e n t P M V T E S T 4 D D Rev. 1.00 1 February 7, 2007 DataSheet.in HT16561 Pin Assignment T E S T E S T E S T E S g 3 e 3 c 3 d 3 g 2 c 2 e 2 g 1 e 1 c 1 d 1 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3...