PCA9621 Datasheet, PDF (1/18 Pages) NXP Semiconductors – 65 mA 8-bit 2-wire bus output port

PCA9621
65 mA 8-bit 2-wire bus output port
Rev. 1 — 9 March 2011
Product data sheet
1. General description
The PCA9621 is a monolithic CMOS integrated circuit for general purpose output drive
configurable from a 2-wire bus interface (including I²C-bus, SMBus, PMBus, and other
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
and written via signals from the 2-wire bus (e.g., I²C-bus or similar).
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
„ Works with I²C-bus (Standard-mode, Fast-mode, and Fast-mode Plus), SMBus
(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