MAX7316 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – 10-Port I/O Expander with LED Intensity Control and Interrupt

19-3055; Rev 0; 10/03
10-Port I/O Expander with LED Intensity
Control and Interrupt
General Description
Features
The MAX7316 I²C/SMBus™-compatible serial interfaced
peripheral provides microprocessors with eight additional
I/O ports plus one output-only port and one input-only
port. Each I/O port can be individually configured as
either an open-drain current-sinking output rated to 50mA
at 5.5V or as a logic input with transition detection. The
output-only port can also be assigned as an interrupt out-
put for transition detection. The outputs are capable of
driving LEDs, or can provide logic outputs with external
resistive pullup up to 5.5V.
Eight-bit PWM current control is available for all nine out-
put ports. Four bits are global control and apply to all LED
outputs to provide coarse adjustment of current from fully
off to fully on in 14 intensity steps. Additionaly each output
then has individual 4-bit control, which further divides the
globally set current into 16 more steps. Alternatively, the
current control can be configured as a single 8-bit control
that sets all outputs at once.
Each output has independent blink timing with two blink
phases. LEDs can be individually set to be on or off dur-
ing either blink phase or to ignore the blink control. The
blink period is controlled by an external clock input (up to
1kHz) on BLINK or by a register. The BLINK input can
also be used as a logic control to turn the LEDs on and
off, or as a general-purpose input.
The MAX7316 is controlled through a 2-wire serial inter-
face, and can be set to one of four I²C addresses.
Applications
o 400kbps, 2-Wire Serial Interface, 5.5V Tolerant
o 2V to 3.6V Operation
o Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Plus Individual 16-Step Intensity Controls
o 2-Phase LED Blinking
o High Output Current (50mA max Per Port)
o Outputs are 5.5V-Rated Open Drain
o Inputs are Overvoltage Protected to 5.5V
o Transition Detection with Interrupt Output
o RST Input Clears Serial Interface and Restores
Power-Up Default State
o Low Standby Current (1.2µA (typ), 3.3µA (max))
o Tiny 3mm x 3mm, Thin QFN Package
o -40°C to +125°C Temperature Range
Ordering Information
PART
MAX7316ATE
MAX7316AEE
TEMP
RANGE
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
16 Thin QFN
3mm x 3mm
x 0.8mm
16 QSOP
TOP
MARK
AAV
—
Typical Application Circuit
5V
LCD Backlights
Keypad Backlights
LED Status Indication
RGB LED Drivers
Relay Drivers
System I/O Ports
Pin Configurations
TOP VIEW
16 15 14 13
AD0 1
12 SCL
P0 2
P1 3
MAX7316ATE
11 INT/08
10 P7
0 047µF
µC
SDA
SCL
I/O
I/O
INT
3 3V
V+
P0
P1
SDA MAX7316 P2
SCL
P3
BLINK
RST
INT/O8
AD0
P4
P5
P6
GND
P7
INPUT 1
INPUT 2
INPUT 3
5V
OUTPUT 1
P2 4
9 P6
567 8
QFN
Pin Configurations continued 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.
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products 1
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