PCA9535A 2 Low-voltage 16-bit I C-bus I/O port with interrupt Rev. 1.1 29 May 2015 Product data sheet 1. General description The PCA9535A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander 2 with interrupt and reset for I C-bus/SMBus applications. NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs, fan control, etc. In addition to providing a flexible set of GPIOs, the wide V range of 1.65 V to 5.5 V DD allows the PCA9535A to interface with next-generation microprocessors and microcontrollers where supply levels are dropping down to conserve power. The PCA9535A contains the PCA9535 register set of four pairs of 8-bit Configuration, Input, Output, and Polarity Inversion registers. The PCA9535A is a pin-to-pin replacement to the PCA9535 and other industry-standard devices. A more fully featured device, the PCAL9535A, is available with Agile I/O features. See the respective data sheet for more details. The PCA9535A open-drain interrupt (INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed. INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data 2 on its ports without having to communicate via the I C-bus. Thus, the PCA9535A can remain a simple slave device. The device outputs have 25 mA sink capabilities for directly driving LEDs while consuming low device current. The power-on reset sets the registers to their default values and initializes the device state machine. 2 Three hardware pins (A0, A1, A2) select the fixed I C-bus address and allow up to eight 2 devices to share the same I C-bus/SMBus. 2. Features and benefits 2 I C-bus to parallel port expander Pin and function compatible with PCA9535 Operating power supply voltage range of 1.65 V to 5.5 VPCA9535A NXP Semiconductors 2 Low-voltage 16-bit I C-bus I/O port with interrupt Low standby current consumption: 1.5 A (typical at 5 V V ) DD 1.0 A (typical at 3.3 V V ) DD Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs V = 0.10 V (typical) hys DD 5 V tolerant I/Os Open-drain active LOW interrupt output (INT) 2 400 kHz Fast-mode I C-bus Internal power-on reset Power-up with all channels configured as inputs No glitch on power-up Latched outputs with 25 mA drive maximum capability for directly driving LEDs Latch-up performance exceeds 100 mA per JESD78, Class II ESD protection exceeds JESD22 2000 V Human Body Model (A114-A) 1000 V Charged-Device Model (C101) Packages offered: TSSOP24, HWQFN24 3. Ordering information Table 1. Ordering information Type number Package Name Description Version PCA9535AHF HWQFN24 plastic thermal enhanced very very thin quad flat package no leads SOT994-1 24 terminals body 4 4 0.75 mm PCA9535APW TSSOP24 plastic thin shrink small outline package 24 leads body width 4.4 mm SOT355-1 3.1 Ordering options Table 2. Ordering options Type number Topside mark Temperature range PCA9535AHF 535A 40 C to +85 C PCA9535APW PCA9535A 40 C to +85 C PCA9535A All information provided in this document is subject to legal disclaimers. NXP B.V. 2015. All rights reserved. Product data sheet Rev. 1.1 29 May 2015 2 of 38