MAX7315 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – 8-Port I/O Expander with LED Intensity Control and Interrupt

19-3056; Rev 0; 10/03
8-Port I/O Expander with LED Intensity
Control and Interrupt
General Description
The MAX7315 I²C™-/SMBus-compatible serial interfaced
peripheral provides microprocessors with 8 I/O ports.
Each I/O port can be individually configured as either an
open-drain current-sinking output rated at 50mA at 5.5V,
or a logic input with transition detection. A ninth port can
be used for transition detection interrupt or as a general-
purpose output. The outputs are capable of directly dri-
ving 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 in 14 intensity steps. Each output then has indi-
vidual 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.
The MAX7315 is pin and software compatible with the
PCA9534 and PCA9554(A).
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 MAX7315 is controlled through the 2-wire I²C/SMBus
serial interface, and can be configured to one of 64 I²C
addresses.
Applications
LCD Backlights
LED Status Indication
Portable Equipment
Laptop Computers
Keypad Backlights
RGB LED Drivers
Cellular Phones
Pin Configurations
Features
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 Control
o Automatic Two-Phase LED Blinking
o 50mA Maximum Port Output Current
o Outputs Are 5.5V-Rated Open Drain
o Inputs Are Overvoltage Protected to 5.5V
o Transition Detection with Interrupt Output
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
o All Ports Can Be Configured as Inputs or Outputs
Ordering Information
PART
TEMP RANGE
MAX7315ATE -40°C to +125°C
MAX7315AEE -40°C to +125°C
MAX7315AUE -40°C to +125°C
PIN-PACKAGE
16 Thin QFN
3mm x 3mm x
0.8mm
16 QSOP
16 TSSOP
TOP
MARK
AAU
—
—
Typical Application Circuit
5V
3.3V
0.047µF
TOP VIEW
16 15 14 13
AD2 1
P0 2
P1 3
P2 4
MAX7315ATE
12 SCL
11 INT/O8
10 P7
9 P6
µC
SDA
SCL
I/O
V+
P0
P1
SDA MAX7315 P2
SCL
P3
P4
P5
INT/O8
P6
AD0
P7
AD1
AD2
GND
5V 3.3V
INPUT 1
INPUT 2
OUTPUT1
OUTPUT2
5678
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.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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