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MAX6954ATL+T Datasheet

  • MAX6954ATL+T

  • IC DRVR DSPL LED 40-TQFN

  • 38頁(yè)

  • Maxim   Maxim

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19-2460; Rev 1; 10/02
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
General Description
The MAX6954 is a compact display driver that inter-
faces microprocessors to a mix of 7-segment, 14-seg-
ment, and 16-segment LED displays through an SPI鈩?
or QSPI鈩?compatible 4-wire serial interface. The serial
interface may be cascaded through multiple devices.
The MAX6954 drives up to 16 digits 7-segment, 8 digits
14-segment, 8 digits 16-segment, or 128 discrete
LEDs, while functioning from a supply voltage as low as
2.7V. The driver includes five I/O expander (or GPIO)
lines, some or all or which may be configured as a key-
switch reader, which automatically scans and
debounces a matrix of up to 32 switches.
Included on chip are full 14- and 16-segment ASCII
104-character fonts, a hexadecimal font for 7-segment
displays, multiplex scan circuitry, anode and cathode
drivers, and static RAM that stores each digit. The max-
imum segment current for the display digits is set using
a single external resistor. Digit intensity can be inde-
pendently adjusted using the 16-step internal digital
brightness control. The MAX6954 includes a low-power
shutdown mode, a scan-limit register that allows the
user to display from 1 to 16 digits, segment blinking
(synchronized across multiple drivers, if desired), and a
test mode, which forces all LEDs on. The LED drivers
are slew-rate limited to reduce EMI.
For a 2-wire interfaced version, refer to the MAX6955*
data sheet. An evaluation kit* (EV kit) for the MAX6955
is available.
*Future
product鈥攃ontact factory for availability.
Features
o
High-Speed 26MHz SPI/QSPI/MICROWIRE鈩?
Compatible Serial Interface
o
2.7V to 5.5V Operation
o
Drives Up to 16 Digits 7-Segment, 8 Digits
14-Segment, 8 Digits 16-Segment, 128 Discrete
LEDs, or a Combination of Digit Types
o
Drives Common-Cathode Monocolor and Bicolor
LED Displays
o
Built-In ASCII 104-Character Font for 14-Segment
and 16-Segment Digits and Hexadecimal Font for
7-Segment Digits
o
Automatic Blinking Control for each Segment
o
10碌A(chǔ) (typ) Low-Power Shutdown (Data Retained)
o
16-Step Digit-by-Digit Digital Brightness Control
o
Display Blanked on Power-Up
o
Slew-Rate Limited Segment Drivers for Lower EMI
o
Five GPIO Port Pins Can Be Configured as Key-
Switch Reader to Scan and Debounce Up to 32
Switches with n-Key Rollover
o
IRQ Output when a Key Input Is Debounced
o
36-Pin SSOP and 40-Pin DIP Packages
o
Automotive Temperature Range Standard
MAX6954
Functional Diagram
GPIO
AND KEY-SCAN
CONTROL
ISET
CURRENT
SOURCE
PWM
BRIGHTNESS
CONTROL
DIGIT
MULTIPLEXER
P0 TO P4
Applications
Set-Top Boxes
Panel Meters
White Goods
Automotive
Bar Graph Displays
Audio/Video Equipment
LED
DRIVERS
O0 TO O23
Ordering Information
PART
MAX6954AAX
MAX6954APL
TEMP RANGE
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
36 SSOP
40 PDIP
OSC
OSC_OUT
DIVIDER/
COUNTER
NETWORK
MAX6954
CHARACTER
GENERATOR
ROM
Pin Configurations and Typical Operating Circuits appear
at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
BLINK
BLINK
CONTROL
RAM
CONFIGURATION
REGISTER
CLK
CS
DIN
DOUT
4-WIRE SERIAL INTERFACE
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX6954ATL+T 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 2,500

  • 集成電路 (IC)

  • PMIC - 顯示器驅(qū)動(dòng)器

  • -

  • LED

  • 7、14、16 段

  • 4 線(xiàn)串行

  • -

  • 22mA

  • 2.7 V ~ 5.5 V

  • -40°C ~ 125°C

  • 表面貼裝

  • 40-WFQFN 裸露焊盤(pán)

  • 40-TQFN-EP（5x5）

  • 帶卷 (TR)

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