MAX6850 MAXIM [Maxim Integrated Products], MAX6850 Datasheet - Page 6

• Manufacturer Part Number: MAX6850
• Description: 4-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6850 VFD controller generates the multiplex
timing for the following VFD display types:
• Multiplexed displays with one digit per grid, and up
• Multiplexed displays with two digits per grid, and up
4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
numeric Vacuum-Fluorescent Display Controller
Figure 1. Example of a One-Digit-per-Grid Display
6
to 48 grids (in 48/1 mode). Each grid can contain
one 7-, 14-, or 16-segment character, a decimal
place (DP) segment, a cursor segment, and four
extra annunciator segments (Figure 1).
to 48 grids (in 96/2 mode). Each grid can contain
two 7-, 14-, or 16-segment characters, two DP seg-
ments, and two cursor segments. No annunciator
segments are supported (Figure 2).
_______________________________________________________________________________________
PIN
15
16
GRID 1
GRID 9
NAME
OSC1
OSC2
GRID 10
GRID 2
Overview of the MAX6850
Detailed Description
Multiplex Clock Input 1. To use the internal oscillator, connect capacitor C
use the external clock, drive OSC1 with a 2MHz to 8MHz CMOS clock.
Multiplex Clock Input 2. Connect resistor R
GRID 11
GRID 3
GRID 12
GRID 4
Each digit can have a 7-, 14-, or 16-segment character,
a DP segment, a cursor segment, and (for one-digit-
per-grid displays only) four annunciators (Figure 3).
The 7, 14, or 16 segments use on-chip fonts that map
the segments. The fonts comprise an ASCII 104-char-
acter fixed-font set, and 24 user-definable characters.
The predefined characters follow the Arial font, with the
addition of the following common symbols: £,
±, ↑, and ↓. The 24 user-definable characters are
uploaded by the user into on-chip RAM through the ser-
ial interface and are lost when the device is powered
down. As well as custom 7- and 14-segment charac-
ters, the user-definable fonts can control up to 14 cus-
tom segments, bar graph characters, or graphics.
Annunciator segments have individual, independent
control, so any combination of annunciators can be lit.
Annunciators can be off, lit, or blink either in phase or
OSC
GRID 13
GRID 5
FUNCTION
from OSC2 to GND.
Pin Description (continued)
GRID 14
GRID 6
OSC
GRID 15
GRID 7
from OSC1 to GND. To
GRID 16
GRID 8
, ¥, °, µ,