19-0749; Rev 1; 12/07
2
SMBus/I C Interfaced 9-Port,
Level-Translating GPIO and LED Driver with CLA
General Description
Features
The MAX7302 I2C-/SMBus™-compatible, serial-interfaced
peripheral features 9 level-translating I/Os, and operates
from a 1.62V to 3.6V power supply. The MAX7302 fea-
LA
♦ 1.62V to 5.5V I/O Level-Translation Port Supply (V
♦ 1.62V to 3.6V Power Supply
)
♦ 9 Individually Configurable GPIO Ports
P1 Open-Drain I/O
tures a port supply V that allows level-translation on I/O
LA
ports to operate from a separate power supply from 1.62V
to 5.5V. An address select input, AD0, allows up to four
unique slave addresses for the device.
P2–P9 Push-Pull or Open-Drain I/Os
♦ Individual 33-Step PWM Intensity Control
♦ Blink Controls with 15 Steps on Outputs
The MAX7302 ports P2–P9 can be configured as inputs,
push-pull outputs, and open-drain outputs. Port P1 can
be configured as a general-purpose input, open-drain
output, or an open-drain INT output. Ports P2–P9 can be
configured as OSCIN and OSCOUT, respectively. Ports
P2–P9 can also be used as configurable logic arrays
(CLAs) to form user-defined logic gates, replacing exter-
nal discrete gates. Outputs are capable of sinking up to
25mA, and sourcing up to 10mA when configured as
push-pull outputs.
♦ 1kHz PWM Period Provides Flicker-Free LED
Intensity Control
♦ 25mA (max) Port Output Sink Current (100mA
max Ground Current)
♦ Inputs Overvoltage Protected Up to 5.5V (V
)
LA
♦ Transition Detection with Optional Interrupt Output
♦ Optional Input Debouncing
♦ I/O Ports Configurable as Logic Gates (CLA)
♦ External RST Input
The MAX7302 includes an internal oscillator for PWM,
blink, and key debounce, or to cascade multiple
MAX7302s. The external clock can be used to set a spe-
cific PWM and blink timing. The RST input asynchronous-
ly clears the 2-wire interface and terminates a bus lockup
involving the MAX7302.
♦ Oscillator Input and Output Enable Cascading
Multiple Devices
♦ Low 0.75µA (typ) Standby Current
Ordering Information
PIN-
PACKAGE
PKG
CODE
All ports configured as an output feature a 33-step PWM,
allowing any output to be set from fully off, 1/32 to 31/32
duty cycle, to fully on. All output ports also feature LED
blink control, allowing blink periods of 1/8s, 1/4s, 1/2s, 1s,
2s, 4s, or 8s. Any port can blink during this period with a
1/16 to 15/16 duty cycle.
PART
TEMP RANGE
MAX7302AEE+ -40°C to +125°C 16 QSOP
E16-4
16 TQFN-EP*
(3mm x 3mm)
MAX7302ATE+ -40°C to +125°C
T1633-4
+Denotes lead-free package.
*EP = Exposed paddle.
The MAX7302 is specified over the -40°C to +125°C
temperature range and is available in 16-pin QSOP and
16-pin TQFN (3mm x 3mm) packages.
Typical Operating Circuit
Applications
Cell Phones
+1.8V
+4.5V
Servers
V
DD
V
LA
System I/O Ports
μC
LCD/Keypad Backlights
LED Status Indicators
SDA
SCL
RST
INT
SDA
MAX7302
SCL
RST
P2
P1/INT
P3
P4
P5
P6
P7
P8
1.8V OPEN-DRAIN OUTPUT
4.5V PUSH-PULL OUTPUT
4.5V LOGIC INPUT
3.3V LOGIC INPUT
2.5V LOGIC INPUT
ADO
P9
GND
Pin Configurations appear at end of data sheet.
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.