PCAL9555AHF,128

NXP  PCAL9555AHF,128  输入/输出扩展, 16bit, 400 kHz, I2C, 1.65 V, 5.5 V, HWQFN

The is a 16-bit Input/output GPIO Expander with interrupt and weak pull-up resistors for I²C-bus/SMBus applications. The I/O expander provides a simple solution when additional I/Os are needed while keeping interconnections to a minimum. In addition to providing a flexible set of GPIOs, the wide VDD range of 1.65 to 5.5V allows the PCAL9555A to interface with next-generation microprocessors and microcontrollers where supply levels are dropping down to conserve power. It contains the PCA9555 register set of four pairs of 8-bit configuration, input, output and polarity inversion registers and additionally, the expander has Agile I/O, which are additional features specifically designed to enhance the I/O. The additional features includes programmable output drive strength, latchable inputs, programmable pull-up/pull-down resistors, maskable interrupt, interrupt status register, programmable open-drain or push-pull outputs.

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Low standby current consumption

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Schmitt-trigger action allows slow input transition and better switching noise immunity

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Open-drain active LOW interrupt output INT\

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Internal power-ON reset

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Power-up with all channels configured as inputs with weak pull-up resistors

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No glitch on power-up

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Latched outputs with 25mA drive maximum capability for directly driving LEDs

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Latch-up performance exceeds 100mA per JESD 78, class II

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Bank selectable push-pull or open-drain output stages

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Read-only register identifies the source of an interrupt

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Four programmable drive strengths to reduce rise and fall times in low capacitance applications

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Input port register values changes are kept until the input port register is read

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Floating input or pull-up/pull-down resistor enable

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Mask prevents the generation of the interrupt when input changes state

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100kR Pull-up/down resistor