PCAL6408AEXX集成电路（IC）的I/O扩展器规格书PDF中文资料

Features and benefits

• I2C-bus to parallel port expander

• Operating power supply voltage range of 1.65 V to 5.5 V

• Allows bidirectional voltage-level translation and GPIO expansion between:

– 1.8 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P

– 2.5 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P

– 3.3 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P

– 5 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P

• Low standby current consumption of 1 μA

• Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA

inputs

– Vhys = 0.18 V (typical) at 1.8 V

– Vhys = 0.25 V (typical) at 2.5 V

– Vhys = 0.33 V (typical) at 3.3 V

– Vhys = 0.5 V (typical) at 5 V

• 5 V tolerant I/O ports

• Active LOW reset input (RESET)

• Open-drain active LOW interrupt output (INT)

• 400 kHz Fast-mode I2C-bus

• Internal power-on reset

• Power-up with all channels configured as inputs

• No glitch on power-up

• Noise filter on SCL/SDA inputs

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

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

• ESD protection exceeds JESD 22

– 2000 V Human-Body Model (A114-A)

– 1000 V Charged-Device Model (C101)

• Packages offered: HVQFN16, TSSOP16, XQFN16, XFBGA16 (1.6 mm × 1.6 mm × 0.5 mm), X2QFN16 (LGA,

Land Grid Array) 1.6 mm x 1.6 mm x 0.35 mm

2.1 Agile I/O features

• Software backward compatible with PCA6408A with interrupts disabled at power-up

• Pin-to-pin drop-in replacement for PCA6408A

• Output port configuration: bank selectable push-pull or open-drain output stages

• Interrupt status: read-only register identifies the source of an interrupt

• Bit-wise I/O programming features:

– Output drive strength: four programmable drive strengths to reduce rise and fall times in low-capacitance

applications

– Input latch: Input Port register values changes are kept until the Input Port register is read

– Pull-up/pull-down enable: floating input or pull-up/pull-down resistor enable

– Pull-up/pull-down selection: 100 kΩ pull-up/pull-down resistor selection

– Interrupt mask: mask prevents the generation of the interrupt when input changes state to prevent spurious interrupts