MAX6850 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX6850

4-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller

Maxim Integrated 

4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-

numeric Vacuum-Fluorescent Display Controller

Pin Description (continued)

PIN

NAME

FUNCTION

15

OSC1

Multiplex Clock Input 1. To use the internal oscillator, connect capacitor COSC from OSC1 to GND. To

use the external clock, drive OSC1 with a 2MHz to 8MHz CMOS clock.

16

OSC2

Multiplex Clock Input 2. Connect resistor ROSC from OSC2 to GND.

GRID 1

GRID 2

GRID 3

GRID 4

GRID 5

GRID 6

GRID 7

GRID 8

GRID 9

GRID 10

GRID 11

Figure 1. Example of a One-Digit-per-Grid Display

GRID 12

GRID 13

GRID 14

GRID 15

GRID 16

Detailed Description

Overview of the MAX6850

The MAX6850 VFD controller generates the multiplex

timing for the following VFD display types:

• Multiplexed displays with one digit per grid, and up

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).

• Multiplexed displays with two digits per grid, and up

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).

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: £, , ¥, °, µ,

±, ↑, 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

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