Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: MAX7313 and MAX7315
Edited by the Electronicstalk Editorial Team on 11 November 2003
I/O expanders ideal
for portable applications
New from Maxim Integrated Products are the MAX7313 and MAX7315 general-purpose I/O expanders
These ICs are packaged in compact 3 x 3 x 0.8mm 16-pin QFN (MAX7315), 4 x 4 x 0.8mm 24-pin QFN (MAX7313), and QSOP packages. The devices interface 5V-tolerant input/output ports with microprocessors and microcontrollers through a 400kHz, two-wire, SMBus/I2C-compatible serial interface. The MAX7315 has eight I/O ports and the MAX7313 has 16 I/O ports.
This article was originally published on Electronicstalk on 11 November 2003 at 8.00am (UK)
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Both devices' IRQ interrupt output provides transition detect for I/Os configured as inputs, or can be configured as an extra I/O port.
While powering up as inputs in the default state, the I/O ports can be 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.
Each device has integrated 8bit PWM brightness control.
The first 4bit portion controls the global intensity of all LED outputs from fully off to fully on, simplifying brightness ramp up and down.
The remaining 4bit portion 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 two-phase blink functionality.
The 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 register.
Three address pins use four-level logic to provide 64 unique slave IDs.
As a result, address conflicts with other system devices are avoided, enabling many devices to be connected easily on the same bus.
The MAX7313 and MAX7315 operate from a 2.0 to 3.6V supply over the automotive temperature range (-40 to +125C).
The MAX7313's typical supply current is 57uA and standby current is typically 1.2uA.
The MAX7315's typical supply current (interface running, PWM enabled) is 51uA and typical standby current is 1.2uA.
Prices start at $1.52 for the MAX7313 and $1.08 for the MAX7315 (1000-up, FOB USA).
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