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PDF MAX6920AWP Data sheet ( Hoja de datos )
| Número de pieza | MAX6920AWP | |
| Descripción | Serial-Interfaced VFD Tube Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX6920
12-Output, 76V, Serial-Interfaced VFD Tube Driver
General Description
The MAX6920 is a 12-output, 76V, vacuum fluo-
rescent display (VFD) tube driver that interfaces a
multiplexed VFD tube to a VFD controller such as the
MAX6850–MAX6853 or to a microcontroller. The
MAX6920 is also ideal for driving either static VFD tubes
or telecom relays.
Data is inputted using an industry-standard 4-wire serial
interface (CLOCK, DATA, LOAD, BLANK) for compatibil-
ity with both industry-standard drivers and Maxim’s VFD
controllers.
For easy display control, the active-high BLANK input
forces all driver outputs low, turning the display off, and
automatically puts the MAX6920 into shutdown mode.
Display intensity may also be controlled by pulse-width
modulating the BLANK input.
The MAX6920 has a serial interface data output pin,
DOUT, allowing any number of devices to be cascaded
on the same serial interface.
The MAX6920 is available in a 20-pin SO pack-
age. Maxim also offers VFD drivers with either 20
(MAX6921/MAX6931) or 32 outputs (MAX6922 and
MAX6932).
Applications
●● White Goods
●● Gaming Machines
●● Avionics
●● Industrial Weighing
●● Security
●● Telecom
Features
●● 5MHz Industry-Standard 4-Wire Serial Interface
●● 3V to 5.5V Logic Supply Range
●● 8V to 76V Grid/Anode Supply Range
●● Push-Pull CMOS High-Voltage Outputs
●● Outputs can Source 40mA, Sink 4mA Continuously
●● Outputs can Source 75mA Repetitive Pulses
●● Outputs can be Paralleled for Higher Current Drive
●● Any Output can be Used as a Grid or an Anode
Driver
●● Blank Input Simplifies PWM Intensity Control
●● Small 20-Pin SO Package
●● -40°C to +125°C Temperature Range
Ordering Information
PART
MAX6920AWP
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
20 Wide SO
Pin Configuration
TOP VIEW
VBB 1
DOUT 2
OUT11 3
OUT10 4
OUT9 5 MAX6920AWP
OUT8 6
OUT7 7
OUT6 8
BLANK 9
GND 10
20 VCC
19 DIN
18 OUT0
17 OUT1
16 OUT2
15 OUT3
14 OUT4
13 OUT5
12 LOAD
11 CLK
Typical Operating Circuit
µC
VFDOUT
VFCLK
VFLOAD
VFBLANK
+5V
C1
100nF
+60V
C2
100nF
20
VCC
1
VBB
MAX6920
19 12
DIN OUT0 – OUT11
11
CLK
12
LOAD
9
BLANK
GND
10
19-3061; Rev 1; 8/14
1 page  
MAX6920
12-Output, 76V, Serial-Interfaced VFD Tube Driver
Pin Description
PIN NAME
1 VBB
2 DOUT
3–8, 13–18
OUT0 to
OUT11
9 BLANK
10 GND
11 CLK
12 LOAD
19 DIN
20 VCC
FUNCTION
VFD Tube Supply Voltage
Serial-Clock Output. Data is clocked out of the internal shift register to DOUT on CLK’s rising edge.
VFD Anode and Grid Drivers. OUT0 to OUT11 are push-pull outputs swinging from VBB to GND.
Blanking Input. High forces outputs OUT0 to OUT11 low, without altering the contents of the output
latches. Low enables outputs OUT0 to OUT11 to follow the state of the output latches.
Ground
Serial-Clock Input. Data is loaded into the internal shift register on CLK’s rising edge.
Load Input. Data is loaded transparently from the internal shift register to the output latch while LOAD
is high. Data is latched into the output latch on LOAD’s rising edge, and retained while LOAD is low.
Serial-Data Input. Data is loaded into the internal shift register on CLK’s rising edge.
Logic Supply Voltage
CLK
DIN
LOAD
BLANK
Figure 1. MAX6920 Functional Diagram
SERIAL-TO-PARALLEL SHIFT REGISTER
LATCHES
DOUT
OUT0 OUT1 OUT2
MAX6920
OUT11
www.maximintegrated.com
Maxim Integrated │ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX6920AWP.PDF ] | |
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