1.

General description

The PCA9621 is a monolithic CMOS integrated circuit for general purpose output drive

systems based on similar principles). Output ports have a 65 mA sink capability, making

them ideal for driving LEDs.

The state of the outputs is determined by a programmable 8-bit register which can be read

The 2-wire bus interface also has 30 mA Fast-mode Plus (Fm+) capability, and

consequently can be run in excess of 1 MHz or up to 4000 pF capacitance. As such, the

PCA9621 can be connected to other 2-wire devices across long cable connections.

It can be mixed with other Fast-mode Plus slaves in systems driven by Fm+ buffers or by

the PCA9646 (fully buffered 4-channel bus switch) to build large scale systems with

high-speed or high-capacitance drive capability, for example large scale LED displays or

controlled lighting.

2.

Features and benefits

8 individually selectable open-drain output ports

65 mA static sink capability on all output ports

Ports may be paralleled for up to 500 mA drive

Ideal for simple LED or general purpose output drive

Fast-mode Plus (30 mA, 4000 pF) 2-wire bus capability

(standard and high power mode), and PMBus

Fast switching times allow operation in excess of 1 MHz

Operating voltages from 2.7 V to 5.5 V

3.

Applications

LED and 7-segment displays

Simple high-power (500 mA) LED dimming

General purpose output

Instrumentation indicators

PCA9621

65 mA 8-bit 2-wire bus output port

Rev. 1 — 9 March 2011

Product data sheet