MAX7314

PRODUCTION

18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Data Sheet (Rev. 4) Product Selection Table
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Overview

  • 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
    • Individual 16-Step Intensity Controls
  • 2-Phase LED Blinking
  • 50mA Maximum Port Output Current
  • Supports Hot Insertion
  • Outputs are 5.5V-Rated Open Drain
  • Inputs are Overvoltage Protected to 5.5V
  • Transition Detection with Interrupt Output
  • 1.2µA (typ), 3.6µA (max) Operating Current
  • Small 4mm x 4mm, Thin QFN Package
  • -40°C to +125°C Temperature Range

The MAX7314 I²C-compatible serial interfaced peripheral provides microprocessors with 16 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 at 50mA and 5.5V, or a logic input with transition detection. The output-only port can be assigned as an interrupt output for transition detection. The outputs are capable of driving LEDs, or providing logic outputs with external resistive pullup up to 5.5V.

Eight-bit PWM current control is built in for all 17 output ports. A 4-bit global control applies to all LED outputs and provides coarse adjustment of current from fully off to fully on with 14 intensity steps in between. Each output has an 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. 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 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 MAX7314 supports hot insertion. All port pins, the active-low INT output, SDA, SCL, active-low RST, BLINK, and the slave address input ADO remain high impedance in powerdown (V+ = 0V) with up to 6V asserted upon them. The MAX7314 is controlled through a 2-wire serial interface, and uses four-level logic to allow four I²C addresses from only one select pin.

Applications

  • Keypad Backlights
  • LCD Backlights
  • LED Status Indication
  • Relay Drivers
  • RGB LED Drivers
  • System I/O Ports
MAX7314
18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection
MAX7314: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2

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Hardware Ecosystem

Parts Product Life Cycle Description
I/O Expanders 9
MAX7300
PRODUCTION 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander
MAX7301
PRODUCTION 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
MAX7311
PRODUCTION 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection
MAX7312
PRODUCTION 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection
MAX7313
PRODUCTION 16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
MAX7315
PRODUCTION 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
MAX7316
10-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
MAX7317
PRODUCTION 10-Port SPI-Interfaced I/O Expander with Overvoltage and Hot-Insertion Protection
MAX7318
PRODUCTION 2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection
LED Drivers 5
MAX6964
PRODUCTION 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection
MAX6965
PRODUCTION 9-Output LED Driver with Intensity Control and Hot-Insertion Protection
MAX6956
PRODUCTION 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
MAX6957
PRODUCTION 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
MAX7310
PRODUCTION 2-Wire-Interfaced 8-Bit I/O Port Expander with Reset
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Tools & Simulations

Software Development 1

IBIS Model 1

Evaluation Kits

MAX7314EVKIT

Evaluation Kit for the MAX7314

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Features and Benefits

  • Evaluates Four RGB and Four White LEDs
  • Independent Output Control of Each LED
  • Demonstrates Unique Single-Pin, One-of-Four 2-Wire Addressing
  • Relay Driving Capable
  • PC Interface or User 2-Wire System Interface
  • Windows 2000/XP/Vista (32-Bit)-Compatible Software
  • USB Powered
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX7314 evaluation kit (EV kit) is a fully assembled and tested surface-mount, 16-output LED driver printed-circuit board (PCB). The circuit uses the MAX7314 IC, an 18-port GPIO with LED intensity control, interrupt, and hot-insertion protection. The EV kit includes four RGB LEDs and four white LEDs (WLEDs) that can be controlled simultaneously by the MAX7314. The EV kit demonstrates the MAX7314 IC’s 8-bit PWM LED intensity control, two-phase LED blinking, reset, interrupt output, and unique single-pin, one-of-four I²C or 2-wire address features.

The MAX7314 EV kit also demonstrates the BLINK feature and includes a configurable oscillator circuit. The EV kit can also be reconfigured for evaluating a relay.

The MAX7314 EV kit provides PCB pads for the MAX7314 2-wire serial interface signals. A Windows 2000/XP/Vista®-compatible software is provided to access the MAX7314 IC. The MAX7314 EV kit can also be directly interfaced to a user-provided 2-wire system.

Applications

  • Keypad Backlights
  • LCD Backlights
  • LED Status Indication
  • Relay Drivers
  • RGB LED Drivers
  • System I/O Ports
MAX7314EVKIT
Evaluation Kit for the MAX7314

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