MAX6958BAEE-T Maxim Integrated Products, MAX6958BAEE-T Datasheet

MAX6958BAEE-T

Manufacturer Part Number

MAX6958BAEE-T

Description

LED Drivers 2-Wire Interfaced, 3 V to 5.5V, 4-Digit,

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6958AAEE.pdf (19 pages)

Specifications of MAX6958BAEE-T

Number Of Digits

Number Of Segments

Low Level Output Current

275000 uA

High Level Output Current

30000 uA

Operating Supply Voltage

3 V to 5.5 V

Maximum Supply Current

6700 uA

Maximum Power Dissipation

667 mW

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Package / Case

QSOP-16

Minimum Operating Temperature

- 40 C

Current page: 1 of 19
Download datasheet (680Kb)

The MAX6958/MAX6959 compact multiplexed com-

mon-cathode display drivers interface microprocessors

to seven-segment numeric LED digits, or discrete LEDs

through an SMBus™- and I

interface. The 2-wire serial interface uses fixed

0.8V/2.1V logic thresholds for compatibility with 2.5V

and 3.3V systems when the display driver is powered

from a 5V supply.

The MAX6958/MAX6959 drive up to four 7-segment

digits, with decimal points, plus four discrete LEDs, or

four 7-segment digits and eight discrete LEDs if the

digits’ decimal points are not used, or up to 36 discrete

LEDs. The MAX6959 also includes two input ports, one

or both of which may be configured as a key-switch

reader, which automatically scans and debounces a

matrix of up to eight switches. Key-switch status is

obtained by polling internal status registers or by con-

figuring the MAX6959 interrupt output.

Other on-chip features include a hexadecimal font for

seven-segment displays, multiplex scan circuitry,

anode and cathode drivers, and static RAM that stores

each digit. The peak segment current for the display

digits is set internally to 23mA. Display intensity is

adjusted using a 64-step internal digital brightness con-

trol. The MAX6958/MAX6959 include a low-power shut-

down mode, a scan-limit register that allows the user to

display from one to four digits, and a test mode, which

forces all LEDs on. The LED drivers are slew-rate-limit-

ed to reduce EMI.

The MAX6958/MAX6959 are available in 16-pin PDIP

and QSOP packages and are fully specified over the

-40°C to +125°C automotive temperature range.

19-2634; Rev 1; 11/05

Pin Configuration, Functional Diagram, and Typical

Application Circuit appear at end of data sheet.

SMBus is a trademark of Intel Corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Set-Top Boxes

Panel Meters

White Goods

9-Segment LED Display Drivers with Keyscan

________________________________________________________________ Maxim Integrated Products

General Description

2-Wire Interfaced, 3V to 5.5V, 4-Digit,

C-compatible 2-wire serial

Audio/Video Equipment

Vending Machines

Industrial Controls

Applications

♦ 400kbps 2-Wire Serial Interface

♦ 3V to 5.5V Operation

♦ Drive 4 Digits plus 4 or 8 Discrete LEDs

♦ Drive Common-Cathode LED Digits

♦ 23mA Constant-Current LED Segment Drive

♦ Hexadecimal Decode/No-Decode Digit Selection

♦ 64-Step Digital Brightness Control

♦ Slew-Rate-Limited Segment Drivers Reduced EMI

♦ Debounces Up to Eight Switches with n-Key

♦ IRQ Output When a Key Input Is Debounced

♦ 20µA Low-Power Shutdown (Data Retained)

♦ Automotive Temperature Range (-40°C to +125°C)

♦ Compact 16-Pin PDIP and QSOP Packages

Ordering Information continued at end of data sheet.

MAX6958AAEE

MAX6958AAPE

Rollover (MAX6959 Only)

(MAX6959 Only)

PART

µC

Typical Operating Circuit

SDA

SCL

-40°C to

RANGE

IRQ

+125°C

TEMP

Ordering Information

SDA

SCL

IRQ/SEG9

INPUT1

INPUT2

ADDRESS

0111000

MAX6959

SLAVE

SEG0–SEG8

DIG0–DIG3

Key0

Key1

Key2

Key3

Key4

Key5

Key6

Key7

GND

DIG0/SEG0

DIG1/SEG1

DIG2/SEG2

DIG3/SEG3

DIG4/SEG4

DIG5/SEG5

DIG6/SEG6

DIG7/SEG7

V+

PIN-

PACKAGE

16 QS OP

16 DIP

Features

CODE

P16-1

E 16- 1

PKG

Related parts for MAX6958BAEE-T

MAX6958BAEE-T Summary of contents

Page 1

... Pin Configuration, Functional Diagram, and Typical Application Circuit appear at end of data sheet. SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ 400kbps 2-Wire Serial Interface ♦ ...

Page 2

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan ABSOLUTE MAXIMUM RATINGS (Voltage with respect to GND.) V+, SCL, SDA .......................................................-0.3V to +6V All Other Pins............................................-0.3V to (V+ + 0.3V) Current DIG0/SEG0–DIG3/SEG3 Sink Current ..........................275mA DIG0/SEG0–SEG9 Source ...

Page 3

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan DC ELECTRICAL CHARACTERISTICS (continued) ( 5.5V unless otherwise noted. Typical values are 5V MIN ...

Page 4

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan (V+ = 5V, LED forward voltage = 2.4V, T SCAN RATE (f ) SCAN vs. TEMPERATURE 800 5.5V 795 790 5V 4.5V 785 780 3V 775 770 765 ...

Page 5

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan PIN NAME MAX6958 MAX6959 1 1 SDA 2 2 SCL 3 — SEG9 — 3 IRQ/SEG9 4–7, 11–15 4–7, 11–15 DIGX, SEGX 8 8 GND 9, 10 — ...

Page 6

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan SDA t SU, DAT t t LOW LOW SCL t HIGH t HD, STA t R START CONDITION Figure 1. 2-Wire Serial Interface Timing Details Differences Between MAX6958 ...

Page 7

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan SDA 0 1 MSB SCL Figure 3. Slave Address SDA SCL DATA STABLE, CHANGE OF DATA VALID DATA ALLOWED Figure 4. Bit Transfer One data bit is transferred ...

Page 8

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan HOW CONTROL BYTE AND DATA BYTE MAP INTO MAX6958/MAX6959s' REGISTERS ACKNOWLEDGE FROM MAX6958/MAX6959 S SLAVE ADDRESS R/W Figure 7. Command and Single Data Byte Received HOW CONTROL BYTE ...

Page 9

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Table 3. Command Address Autoincrement Behavior COMMAND BYTE AUTOINCREMENT BEHAVIOR ADDRESS RANGE 00000000 to Command byte address autoincrements 01111110 after byte read or written Command byte address remains ...

Page 10

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Table 5. No-Decode Mode Data Bits and Corresponding Segment Lines ADDRESS DIGIT/SEGMENT REGISTER CODE (HEX) Digit 0 0x20 Digit 1 0x21 Digit 2 0x22 Digit 3 0x23 Segments ...

Page 11

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Table 8. Seven-Segment Mapping Decoder for Hexadecimal Font REGISTER DATA 7-SEGMENT CHARACTER D7– ...

Page 12

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Configuration Register Use the configuration register to enter and exit shut- down, check device type, and globally clear the digit data (Tables 10–13). The S bit selects shutdown ...

Page 13

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Table 15. Global Intensity Register Format TYPICAL SEGMENT DUTY CYCLE CURRENT (mA) 1/64 (min on) 0.36 2/64 0.72 3/64 1.08 4/64 1.44 5/64 1.80 6/64 2.16 — — ...

Page 14

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Ports and Key Scanning (MAX6959 Only) The MAX6959 features two input ports, INPUT1 and INPUT2. These two ports can be used as general-pur- pose logic inputs, or configured ...

Page 15

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan THE FIRST HALF OF A 41ms KEYSCAN CYCLE 1.28ms MULTIPLEX 1.28ms MULTIPLEX 1.28ms MULTIPLEX CYCLE 1 CYCLE 2 CYCLE 3 5µs TO 315µs DIGIT PERIOD DIG0/SEG0 DIG1/SEG1 DIG2/SEG2 ...

Page 16

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Key Debounced Register (MAX6959 Only) The key debounced register shows which keys have been detected as debounced by the keyscanning cir- cuit (Table 17). Each bit in the ...

Page 17

... SEG V+ = 5.25V P = 5.25V (5.9mA) + (5.25V - 2.2V) D (63/64 ✕ 23mA ✕ 0.652W Ordering Information (continued) TEMP SLAVE PART RANGE ADDRESS -40°C to MAX6958BAEE 0111001 +125°C -40°C to MAX6958BAPE 0111001 +125°C -40°C to MAX6959AAEE 0111000 +125°C -40°C to MAX6959AAPE 0111000 +125°C -40°C to MAX6959BAEE 0111001 +125° ...

Page 18

Interfaced 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan Pin Configuration TOP VIEW SDA 1 SCL 2 (IRQ/SEG9) SEG9 3 MAX6958/ DIG0/SEG0 4 MAX6959 DIG1/SEG1 5 DIG2/SEG2 6 DIG3/SEG3 7 GND 8 QSOP/DIP ( ) MAX6959 ONLY ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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