MAX6958_Maxim_elenota.pl.pdf

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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 I 2 C-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
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
Rollover (MAX6959 Only)
IRQ Output When a Key Input Is Debounced
(MAX6959 Only)
20µA Low-Power Shutdown (Data Retained)
Automotive Temperature Range (-40°C to +125°C)
Compact 16-Pin PDIP and QSOP Packages
Ordering Information
TEMP
RANGE
SLAVE
ADDRESS
PIN-
PACKAGE
PART
MAX6958 AAEE
-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
8
8
8
8
µ
C
DIG0–DIG3
SEG0–SEG8
8
Applications
SDA
SCL
IRQ
SDA
SCL
IRQ/SEG9
5V
Set-Top Boxes
Panel Meters
White Goods
Audio/Video Equipment
Vending Machines
Industrial Controls
V+
MAX6959
INPUT1
INPUT2
GND
Key 0
DIG0/SEG0
Key 1
DIG1/SEG1
Key 2
DIG2/SEG2
Key 3
DIG3/SEG3
Key 4
Pin Configuration, Functional Diagram, and Typical
Application Circuit appear at end of data sheet.
DIG4/SEG4
Key 5
DIG5/SEG5
Key 6
DIG6/SEG6
Key 7
DIG7/SEG7
SMBus is a trademark of Intel Corp.
________________________________________________________________ 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.
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2-Wire Interfaced, 3V to 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 Current .................................30mA
SCL, SDA, INPUT1, INPUT2 ...........................................20mA
Continuous Power Dissipation (T A = +70°C)
16-Pin DIP (derate at 10.5mW/°C above +70°C) .........842mW
16-Pin QSOP (derate at 8.34mW/°C above +70°C).....667mW
Operating Temperature Range
MAX695_ (T MIN to T MAX ) ...............................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V+ = 3V to 5.5V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V+ = 5V, T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V+
3
5.5
V
T A = +25°C
20
50
Shutdown mode, all
digital inputs at V+
Shutdown Supply Current
I SHDN
µA
T A = T MIN to +85°C
125
T A = +25°C
5.9
6.7
Intensity set to full,
no display load
connected, INPUT1
and INPUT2 open
circuit
Operating Supply Current
I+
mA
T A = T MIN to T MAX
7.5
Display Scan Rate
f SCAN
4 digits scanned
T A = T MIN to T MAX
510
780
1050
Hz
Keyscan Debounce Time
t DEBOUNCE
T A = T MIN to T MAX
30.3
41
63
ms
T A = +25°C
-19
-23
-29
V LED = 2.4V,
V+ = 4.5V to 5.5V
T A = T MIN to T MAX
-18
-30
Segment Drive Source Current
I SEG
mA
T A = +25°C
-16
-29.5
V LED = 2V,
V+ = 3V to 5.5V
T A = T MIN to T MAX
-15.5
-30.5
Segment Current Slew Rate
∆ I SEG / ∆ t
11
mA/µs
Segment Drive Current Matching
∆
I SEG
4
%
LOGIC INPUTS AND OUTPUTS
Input Leakage Current SCL
and SDA
I IH , I IL
-1
+1
µA
Logic High Input Voltage SCL,
SDA
V IH
2.1
V
Logic Low Input Voltage SCL,
SDA
V IL
0.8
V
Input Leakage Current INPUT1,
INPUT2
I INH , I INL
INPUT_ = V+
-1
+1
µA
Logic High Input Voltage INPUT1,
INPUT2
0.7 ✕
V+
V INH
V
Logic Low Input Voltage INPUT1,
INPUT2
0.3 ✕
V+
V INL
V
2
_______________________________________________________________________________________
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2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
DC ELECTRICAL CHARACTERISTICS (continued)
(V+ = 3V to 5.5V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V+ = 5V, T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Pullup to V+ INPUT1, INPUT2
I PULLUP
26.5
µA
I SINK = 6mA, T A = -40
C to +85
C
0.4
°
°
IRQ/SEG9, SDA Output Low
Voltage
V OLBK
V
I SINK = 4mA, T A = T MIN to T MAX
0.4
SDA Output Low Voltage
V OL(SDA)
I SINK = 6mA
0.4
V
TIMING CHARACTERISTICS
(V+ = 3V to 5.5V, T A = T MIN to T MAX , Figure 1, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Serial Clock Frequency
f SCL
400
kHz
Bus Free Time Between a STOP
and a START Condition
t BUF
1.3
µs
Hold Time (Repeated) START
Condition
t HD, STA
0.6
µs
Repeated START Setup Time
t SU, STA
0.6
µs
STOP Condition Setup Time
t SU, STO
0.6
µs
Data Hold Time
t HD, DAT
(Note 3)
0.9
µs
Data Setup Time
t SU, DAT
100
ns
SCL Clock Low Period
t LOW
1.3
µs
SCL Clock High Period
t HIGH
0.6
µs
Rise Time of Both SDA and SCL
Signals, Receiving
20 +
0.1C B
t R
(Notes 2, 4)
300
ns
Fall Time of Both SDA and SCL
Signals, Receiving
20 +
0.1C B
t F
(Notes 2, 4)
300
ns
20 +
0.1C B
Fall Time of SDA Transmitting
t F
(Notes 2, 5)
250
ns
Pulse Width of Spike Suppressed
t SP
(Note 6)
50
ns
Capacitive Load for Each Bus
Line
C B
400
pF
Note 1:
All parameters tested at T A =+25°C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design.
Note 3:
A master device must provide a hold time of at least 300ns for the SDA signal (referred to V IL of the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 4:
C B = total capacitance of one bus line in pF. t R and t F measured between 0.3V+ and 0.7V+.
Note 5:
I SINK ≤
6mA. C B = total capacitance of one bus line in pF. t R and t F measured between 0.3V+ and 0.7V+.
Note 6:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
_______________________________________________________________________________________
3
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2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
Typical Operating Characteristics
(V+ = 5V, LED forward voltage = 2.4V, T A = +25°C, unless otherwise noted.)
SCAN RATE (f SCAN )
vs. TEMPERATURE
KEYSCAN DEBOUNCE TIME (t DEBOUNCE )
vs. TEMPERATURE
SCAN RATE (f SCAN )
vs. SUPPLY VOLTAGE
800
42.5
790
3V
795
5.5V
785
42.0
5V
790
4.5V
785
780
4.5V
41.5
5V
780
775
3V
5.5V
775
41.0
770
770
765
40.5
765
760
755
40.0
760
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE ( ° C)
TEMPERATURE ( ° C)
SUPPLY VOLTAGE (V)
KEYSCAN DEBOUNCE TIME (t DEBOUNCE )
vs. SUPPLY VOLTAGE
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
42.2
25
25
42.0
20
20
41.8
41.6
15
15
41.4
41.2
10
10
41.0
40.8
5
5
40.6
V LED = 2.4V
V LED = 2V
40.4
0
0
3.0
3.5
4.0
4.5
5.0
5.5
4.50
4.75
5.00
5.25
5.50
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT PULLUP CURRENT
vs. TEMPERATURE
WAVEFORM AT DIG0/SEG0,
FULL INTENSITY
45
40
5.5V
35
5V
4.5V
30
25
20
15
3V
10
V DIG0 /
SEG0
1V/div
5
0
-40
-20
0
20
40
60
80
100
120
200 µ s/div
TEMPERATURE (
C)
°
4
_______________________________________________________________________________________
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2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
Pin Description
PIN
NAME
FUNCTION
MAX6958
MAX6959
1
1
SDA
Serial Data I/O
2
2
SCL
Serial Clock Input
3
—
SEG9
Segment Output. Segment driver sourcing current to a display anode.
Interrupt or Segment Output. May be segment driver sourcing current to a display
anode, or open-drain interrupt output, or open-drain logic output.
—
3
IRQ/SEG9
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.
4–7, 11–15
4–7, 11–15
DIGX, SEGX
8
8
GND
Ground
9, 10
—
N.C.
No Connect. Connect to V+ or leave open.
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.
—
9
INPUT1
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.
—
10
INPUT2
16
16
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
DIG0/SEG0
DIG1/SEG1
DIG2/SEG2
DIG3/SEG3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9/IRQ
LED Digit 0
CC0
SEG 0
SEG g
SEG f
SEG e
SEG d
SEG c
SEG b
SEG a
SEG 4
LED Digit 1
SEG 1
CC1
SEG g
SEG f
SEG e
SEG d
SEG c
SEG b
SEG a
SEG 5
LED Digit 2
SEG g
SEG f
CC2
SEG 2
SEG e
SEG d
SEG c
SEG b
SEG a
SEG 6
LED Digit 3
SEG g
SEG f
SEG 3
CC3
SEG e
SEG d
SEG c
SEG b
SEG a
SEG 7
_______________________________________________________________________________________
5
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