MAX6958 Maxim, MAX6958 Datasheet
MAX6958
Manufacturer Part Number
MAX6958
Description
2-Wire Interfaced / 3V to 5.5V / 4-Digit / 9-Segment LED Display Drivers with Keyscan
Manufacturer
Maxim
Datasheet
1.MAX6958.pdf
(19 pages)
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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 0; 10/02
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,
2
C-compatible 2-wire serial
Audio/Video Equipment
Vending Machines
Industrial Controls
Applications
o 400kbps 2-Wire Serial Interface
o 3V to 5.5V Operation
o Drive 4 Digits plus 4 or 8 Discrete LEDs
o Drive Common-Cathode LED Digits
o 23mA Constant-Current LED Segment Drive
o Hexadecimal Decode/No-Decode Digit Selection
o 64-Step Digital Brightness Control
o Slew-Rate-Limited Segment Drivers Reduced EMI
o Debounces Up to Eight Switches with n-Key
o IRQ Output When a Key Input Is Debounced
o 20µA Low-Power Shutdown (Data Retained)
o Automotive Temperature Range (-40°C to +125°C)
o Compact 16-Pin PDIP and QSOP Packages
Ordering Information continued at end of data sheet.
*EP = Exposed pad.
MAX6958AAEE -40°C to +125°C
MAX6958AAPE
Rollover (MAX6959 Only)
(MAX6959 Only)
PART
µC
Typical Operating Circuit
-40°C to +125°C
SDA
SCL
IRQ
RANGE
TEMP
Ordering Information
SDA
SCL
IRQ/SEG9
INPUT1
INPUT2
8
MAX6959
8
SEG0–SEG8
DIG0–DIG3
8
Key0
Key1
Key2
Key3
Key4
Key5
Key6
Key7
ADDRESS
GND
0111000
0111000
DIG0/SEG0
DIG1/SEG1
DIG2/SEG2
DIG3/SEG3
DIG4/SEG4
DIG5/SEG5
DIG6/SEG6
DIG7/SEG7
V+
SLAVE
8
8
5V
Features
PIN-
PACKAGE
16 QS O P - E P *
16 DIP
1
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