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PDF MAX6958 Data sheet ( Hoja de datos )
| Número de pieza | MAX6958 | |
| Descripción | 2-Wire Interfaced / 3V to 5.5V / 4-Digit / 9-Segment LED Display Drivers with Keyscan | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2634; Rev 0; 10/02
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
General Description
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 I2C-compatible 2-wire serial
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.
Features
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
Rollover (MAX6959 Only)
o IRQ Output When a Key Input Is Debounced
(MAX6959 Only)
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
PART
TEMP
RANGE
SLAVE PIN-
ADDRESS PACKAGE
MAX6958AAEE -40°C to +125°C 0111000 16 QSOP-EP*
MAX6958AAPE -40°C to +125°C 0111000 16 DIP
Ordering Information continued at end of data sheet.
*EP = Exposed pad.
Typical Operating Circuit
8888
Set-Top Boxes
Panel Meters
White Goods
Applications
Audio/Video Equipment
Vending Machines
Industrial Controls
Pin Configuration, Functional Diagram, and Typical
Application Circuit appear at end of data sheet.
SMBus is a trademark of Intel Corp.
µC
SDA
SCL
IRQ
SDA
SCL
IRQ/SEG9
DIG0–DIG3
SEG0–SEG8
V+
8
5V
MAX6959
INPUT1
INPUT2
GND
Key0
DIG0/SEG0
Key1
DIG1/SEG1
Key2
DIG2/SEG2
Key3
DIG3/SEG3
Key4
DIG4/SEG4
Key5
DIG5/SEG5
Key6
DIG6/SEG6
Key7
DIG7/SEG7
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
Pin Description
PIN
MAX6958 MAX6959
11
22
3—
—3
4–7, 11–15 4–7, 11–15
8
9, 10
—
8
—
9
— 10
16 16
NAME
FUNCTION
SDA
SCL
SEG9
Serial Data I/O
Serial Clock Input
Segment Output. Segment driver sourcing current to a display anode.
IRQ/SEG9
Interrupt or Segment Output. May be segment driver sourcing current to a display
anode, or open-drain interrupt output, or open-drain logic output.
DIGX, SEGX
GND
N.C.
Digit and Segment Drivers. Digit X outputs sink current from the display common
cathode when acting as digit drivers. Segment X drivers source current to the display
anodes. Segment/digit drivers are high impedance when turned off.
Ground
No Connect. Connect to V+ or leave open.
INPUT1
General-Purpose Input Port 1 with Internal Pullup. May be configured as general-
purpose logic input or keyscan input. Connect to V+ or leave open if unused.
INPUT2
General-Purpose Input Port 2 with Internal Pullup. May be configured as general-
purpose logic input or keyscan input. Connect to V+ or leave open if unused.
V+ Positive Supply Voltage
Detailed Description
The MAX6958/MAX6959 serially interfaced display dri-
vers drive up to: four 7-segment digits plus four dis-
crete LEDs if the decimal points are used, or four
7-segment digits plus eight discrete LEDs if the deci-
mal points are not used, or 36 discrete LEDs. Table 1
lists the display connection scheme.
The MAX6958/MAX6959 include the hexadecimal font
map for seven-segment displays. The seven-segment
LED digits can be controlled directly or programmed to
use the hexadecimal font. Direct segment control
allows the MAX6958/MAX6959 to drive bar graphs and
discrete LED indicators.
The MAX6958/MAX6959 use a multiplexing scheme that
minimizes the connections between the driver and LED
display. The MAX6958/MAX6959 can drive monocolor
and bicolor single-digit type displays, and monocolor
dual-digit displays. Dual-digit displays internally
wire together the equivalent segments for each digit,
requiring only eight segment pins instead of 16. The
MAX6958/MAX6959 can also drive multidigit LED dis-
plays that have the segments individually pinned for
each digit.
To connect four single-digit displays to the MAX6958/
MAX6959, connect cathode outputs DIG0/SEG0–
DIG3/SEG3 to the cathodes of the four display digits as
shown in Table 1 (CC0–CC3). Drive eight additional
LEDs with SEG0 to SEG7. Four of the eight LEDs can
be the decimal point (DP) segments of the four dis-
plays, and the other four can be discrete LED indica-
tors.
To connect two dual-digit displays to the MAX6958/
MAX6959, connect cathode outputs DIG0/SEG0 and
DIG1/SEG1 to the cathodes of the first dual digit.
Connect DIG2/SEG2 and DIG3/SEG3 to the cathodes
of the second dual digit. SEG0 to SEG3 can only drive
discrete LEDs, not digit DP segments. SEG4 to SEG7
can drive the DP segments if required. Bicolor single-
digit displays are connected and treated as dual-digit
displays, each digit being one of the two colors.
Table 1. Standard Driver Connection to LED Displays
LED Digit 0
LED Digit 1
LED Digit 2
LED Digit 3
DIG0/SEG0
CC0
SEG 1
SEG g
SEG g
DIG1/SEG1
SEG 0
CC1
SEG f
SEG f
DIG2/SEG2
SEG g
SEG g
CC2
SEG 3
DIG3/SEG3
SEG f
SEG f
SEG 2
CC3
SEG 4
SEG e
SEG e
SEG e
SEG e
SEG 5
SEG d
SEG d
SEG d
SEG d
SEG 6
SEG c
SEG c
SEG c
SEG c
SEG 7
SEG b
SEG b
SEG b
SEG b
SEG 8
SEG a
SEG a
SEG a
SEG a
SEG 9/IRQ
SEG 4
SEG 5
SEG 6
SEG 7
_______________________________________________________________________________________ 5
5 Page 
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
Table 8. Seven-Segment Mapping Decoder for Hexadecimal Font
7-SEGMENT
REGISTER DATA
ON SEGMENTS = 1
CHARACTER D7–D4 D3 D2 D1 D0
a
b
c
d
e
f
g
0 X00001111110
1 X00010110000
2 X00101101101
3 X00111111001
4 X01000110011
5 X01011011011
6 X01101011111
7 X01111110000
8 X10001111111
9 X10011111011
A X10101110111
B X10110011111
C X11001001110
D X11010111101
E X11101001111
F X11111000111
Table 9. Initial Power-Up Register Status
REGISTER
POWER-UP CONDITION
ADDRESS
REGISTER DATA
CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0
Decode mode No decode for digits 3–0
0x01
XXXX 0 0 0 0
Intensity
4/64 intensity
0x02
XX000100
Scan limit
Display 4 digits: 0 1 2 3
0x03
XXXXXX 1 1
Configuration Shutdown enabled
0x04
X X 0 X X X D bit 0
GPIO*
IRQ/SEG9 is a segment output
(not IRQ or logic output);
INPUT2 and INPUT1 are logic
inputs; IRQ flag is clear
0x06
10000XX0
Display test
Normal operation
0x07
X X XX X X X 0
Key debounced* No key detected as debounced
0x08
00000000
Key pressed* No key detected as pressed
0x0C
00000000
Digit 0
Blank digit (because not decoded)
0x20
X0000000
Digit 1
Blank digit (because not decoded)
0x21
X0000000
Digit 2
Blank digit (because not decoded)
0x22
X0000000
Digit 3
Blank digit (because not decoded)
0x23
X0000000
Segments
Blank segments
0x24
00000000
*MAX6959 only.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX6958.PDF ] | |
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