Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: MAX7316
Edited by the Electronicstalk Editorial Team on 18 November 2003
I/O extender adds LED brightness control
The MAX7316 general-purpose I/O extender provides microprocessors and microcontrollers with eight 5V-tolerant input/output ports, plus one output-only port and one input-only port.
The MAX7316 general-purpose I/O extender provides microprocessors and microcontrollers with eight 5V-tolerant input/output ports, plus one output-only port and one input-only port The output-only port can be assigned as an interrupt output for input transition detection
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Powering up as inputs in the default state, the I/O ports are configured by the master as an input or an open-drain output.
Each overvoltage-tolerant I/O port is capable of sinking up to 50mA at 5.5V.
A reset input clears the serial interface and restores the outputs to their default power-up state of high impedance.
The device also incorporates 8bit PWM brightness control for LEDs.
The first 4bit controls the global intensity of all LED outputs from fully off to fully on, thereby simplifying brightness ramp up and down.
The remaining 4bit further breaks down the globally set current into 16 steps of brightness control for each individual LED.
Alternatively, a single 8bit control can set all outputs at once with 240 intensity steps.
Each output has independent, two-phase blink functionality.
Ports are individually configured to be off or on during each blink phase or to ignore the blink control.
The blink period is controlled by a clock input up to 1kHz on the blink pin, or by a register.
The blink input operates as a general-purpose input (GPI), or as a logic control to turn the LEDs on and off.
The MAX7316 has one address pin that provides four unique slave IDs.
It operates from a 2.0 to 3.6V supply over the automotive temperature range (-40 to +125C).
The MAX7316's supply current (interface running, PWM enabled) is typically 51uA and typical standby current is 1.2uA.
Prices start at $1.28 (1000-up, FOB USA).
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