Rainbow Electronics MAX7315 - Manual

General Description
The MAX7315 I 2 C™-/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 I 2 C/SMBus
serial interface, and can be configured to one of 64 I 2 C
addresses.
Applications
Features
♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant
♦ 2V to 3.6V Operation
♦ Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Plus Individual 16-Step Intensity Control
♦ Automatic Two-Phase LED Blinking
♦ 50mA Maximum Port Output Current
♦ Outputs Are 5.5V-Rated Open Drain
♦ Inputs Are Overvoltage Protected to 5.5V
♦ Transition Detection with Interrupt Output
♦ Low Standby Current (1.2µA typ; 3.3µA max)
♦ Tiny 3mm x 3mm, Thin QFN Package
♦ -40°C to +125°C Temperature Range
♦ All Ports Can Be Configured as Inputs or Outputs
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
________________________________________________________________ Maxim Integrated Products 1
16 15 14 13
AD0 V+ SDA
9
10
11
12
P6
P7
SCL
4
3
2
1
P2
P1
P0
5 6 7 8
P3
GND
P4 P5
AD2
INT/O8
AD1
QFN
TOP VIEW
MAX7315ATE
Pin Configurations
MAX7315
P5
P0
P1
P2
P3
V+
3.3V
µC
SDA
SCL
SDA
I/O
AD0
5V 3.3V
P6
P7
SCL
P4
OUTPUT2
OUTPUT1
GND
5V
INPUT 1
INPUT 2
AD2
AD1
0.047 µF
INT/O8
Typical Application Circuit
19-3056; Rev 0; 10/03
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX7315ATE -40 °C to +125°C
16 Thin QFN
3mm x 3mm x
0.8mm
AAU
MAX7315AEE -40 °C to +125°C 16 QSOP —
MAX7315AUE -40 °C to +125°C 16 TSSOP —
Pin Configurations continued at end of data sheet.
LCD Backlights
LED Status Indication
Portable Equipment
Laptop Computers
Keypad Backlights
RGB LED Drivers
Cellular Phones
Purchase of I 2 C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2 C Patent Rights to use these compo-
nents in an I 2 C system, provided that the system conforms to the
I 2 C Standard Specification as defined by Philips.