MAX7313 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – 16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection

19-3059; Rev 4; 4/05
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
General Description
The MAX7313 I²C™-compatible serial interfaced
peripheral provides microprocessors with 16 I/O ports.
Each I/O port can be individually configured as either
an open-drain current-sinking output rated at 50mA and
5.5V, or a logic input with transition detection. A 17th
port can be used for transition detection interrupt, or as
a general-purpose output. The outputs are capable of
driving LEDs, or providing logic outputs with external
resistive pullup up to 5.5V.
PWM current drive is integrated with 8 bits of control.
Four bits are global control and apply to all LED outputs
to provide coarse adjustment of current from fully off to
fully on with 14 intensity steps. Each output then has
individual 4-bit control, which further divides the global-
ly set current into 16 more steps. Alternatively, the cur-
rent control can be configured as a single 8-bit control
that sets all outputs at once.
The MAX7313 is pin and software compatible with the
MAX7311, PCA9535, and PCA9555.
Each output has independent blink timing with two blink
phases. All LEDs can be individually set to be on or off
during either blink phase, or to ignore the blink control.
The blink period is controlled by a register.
The MAX7313 supports hot insertion. All port pins, the
INT output, SDA, SCL, and the slave-address inputs
ADO-2 remain high impedance in power-down (V+ =0V)
with up to 6V asserted upon them.
The MAX7313 is controlled through the 2-wire
I²C/SMBus serial interface, and can be configured to
any one of 64 I²C addresses.
Applications
LCD Backlights
LED Status Indication
Portable Equipment
Keypad Backlights
RGB LED Drivers
Notebook Computers
Typical Application Circuit appears at end of data sheet.
Purchase of I²C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I²C Patent Rights to use these compo-
nents in an I²C system, provided that the system conforms to the
I²C Standard Specification as defined by Philips.
Features
♦ 400kbs, 2-Wire Serial Interface, 5.5V Tolerant
♦ 2V to 3.6V Operation
♦ Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Individual 16-Step Intensity Controls
♦ Two-Phase LED Blinking
♦ High Output Current (50mA max Per Port)
♦ Outputs are 5.5V-Rated Open Drain
♦ Supports Hot Insertion
♦ Inputs are Overvoltage Protected to 5.5V
♦ Transition Detection with Interrupt Output
♦ 1.2µA (typ), 3.6µA (max) Standby Current
♦ Small 4mm x 4mm Thin QFN Package
♦ -40°C to +125°C Temperature Range
♦ All Ports Can Be Configured as Inputs or Outputs
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
24 Thin QFN
MAX7313ATG -40°C to +125°C 4mm x 4mm T2444-4
x 0.8mm
MAX7313AEG -40°C to +125°C 24 QSOP
—
Pin Configurations
TOP VIEW
18 17 16 15 14 13
SCL 19
12 P10
SDA 20
11 P9
V+ 21
INT/O16 22
MAX7313ATG
10 P8
9 GND
AD1 23
8 P7
AD2 24
7 P6
12 3456
THIN QFN
Pin Configurations continued at end of data sheet.
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