MAX6956 Maxim, MAX6956 Datasheet
MAX6956
Manufacturer Part Number
MAX6956
Description
2-Wire-Interfaced / 2.5V to 5.5V / 20-Port or 28-Port LED Display Driver and I/O Expander
Manufacturer
Maxim
Datasheet
1.MAX6956.pdf
(27 pages)
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The MAX6956 compact, serial-interfaced LED display
driver/I/O expander provide microprocessors with up to
28 ports. Each port is individually user configurable to
either a logic input, logic output, or common-anode
(CA) LED constant-current segment driver. Each port
configured as an LED segment driver behaves as a
digitally controlled constant-current sink, with 16 equal
current steps from 1.5mA to 24mA. The LED drivers are
suitable for both discrete LEDs and CA numeric and
alphanumeric LED digits.
Each port configured as a general-purpose I/O (GPIO)
can be either a push-pull logic output capable of sink-
ing 10mA and sourcing 4.5mA, or a Schmitt logic input
with optional internal pullup. Seven ports feature config-
urable transition detection logic, which generates an
interrupt upon change of port logic level. The MAX6956
is controlled through an I
interface, and uses four-level logic to allow 16 I
addresses from only 2 select pins.
The MAX6956AAX and MAX6956ATL have 28 ports
and are available in 36-pin SSOP and 40-pin thin QFN
packages, respectively. The MAX6956AAI and
MAX6956ANI have 20 ports and are available in 28-pin
SSOP and 28-pin DIP packages, respectively.
For an SPI-interfaced version, refer to the MAX6957
data sheet. For a lower cost pin-compatible port
expander without the constant-current LED drive capa-
bility, refer to the MAX7300 data sheet.
19-2414; Rev 2; 11/03
Typical Operating Circuit appears at end of data sheet.
Purchase of I
or one of its sublicensed Associated Companies, conveys a
license under the Philips I
nents in an I
I
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.
2
C Standard Specification as defined by Philips.
Set-Top Boxes
Panel Meters
White Goods
Automotive
28-Port LED Display Driver and I/O Expander
2
C system, provided that the system conforms to the
2
C components of Maxim Integrated Products, Inc.,
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
________________________________________________________________ Maxim Integrated Products
2
C Patent Rights to use these compo-
General Description
2
C™-compatible 2-wire serial
Bar Graph Displays
Industrial Controllers
System Monitoring
Applications
2
C
o 400kbps I
o 2.5V to 5.5V Operation
o -40°C to +125°C Temperature Range
o 20 or 28 I/O Ports, Each Configurable as
o 11µA (max) Shutdown Current
o 16-Step Individually Programmable Current
o Logic Transition Detection for Seven I/O Ports
Pin Configurations continued at end of data sheet.
MAX6956ANI
MAX6956AAI
MAX6956AAX
MAX6956ATL
Control for Each LED
Constant-Current LED Driver
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
PART
TOP VIEW
2
C-Compatible Serial Interface
GND
GND
ISET
AD0
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
10
11
12
13
14
1
2
3
4
5
6
7
8
9
TEMP RANGE
Ordering Information
SSOP/DIP
MAX6956
Pin Configurations
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V+
AD1
SCL
SDA
P31
P30
P29
P28
P27
P26
P25
P24
P23
P22
PIN-PACKAGE
28 DIP
28 SSOP
36 SSOP
40 Thin QFN
Features
1
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