PCA9661B,118

PCA9661 - Parallel bus to 1Channel Fm+ I2C-bus controller QFP 48Pin

Overview

The PCA9661 is an advanced single master mode I²C-bus controller. It is a fourth generation bus controller designed for data intensive I²C-bus data transfers. It has one I²C-bus channel with data rates up to 1 Mbits/s using the Fast-mode Plus Fm+ open-drain topology. The serial channel has a generous 4352 byte data buffer which makes the PCA9661 the ideal companion to any CPU that needs to transmit and receive large amounts of serial data with minimal interruptions.

The PCA9661 is a 8-bit parallel-bus to I²C-bus protocol converter. It can be configured to communicate with up to 64 slaves in one serial sequence with no intervention from the CPU. The controller also has a sequence loop control feature that allows it to automatically retransmit a stored sequence.

Its onboard oscillator and PLL allow the controller to generate the clocks for the I²C-bus and for the interval timer used in sequence looping. This feature greatly reduces CPU overhead when data refresh is required in fault tolerant applications.

An external trigger input allows data synchronization with external events. The trigger signal controls the rate at which a stored sequence is re-transmitted over the I²C-bus.

Error reporting is handled at the transaction level, channel level, and controller level. A simple interrupt tree and interrupt masks allow further customization of interrupt management.

The controller parallel bus interface runs at 3.3 V and the I²C-bus I/Os logic levels are referenced to a dedicated VDDIO input pin with a range of 3.0 V to 5.5 V.

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## Features

* Parallel-bus to I²C-bus protocol converter and interface

* 1 Mbit/s and up to 30 mA SCL/SDA IOL Fast-mode Plus Fm+ capability

* Internal oscillator trimmed to 1 % accuracy reduces external components

* 4352-byte buffer for the Fm+ channel

* Three levels of reset: individual software channel reset, global software reset, global hardware RESET pin

* Communicates with up to 64 slaves in one serial sequence

* Sequence looping with interval timer

* Supports SCL clock stretching

* JTAG port available for boundary scan testing during board manufacturing process

* Trigger input synchronizes serial communication exactly with external events

* Maskable interrupts

* Fast-mode Plus I²C-bus capable and compatible with SMBus

* Operating supply voltage: 3.0 V to 3.6 V device and host interface

* I²C-bus I/O supply voltage: 3.0 V to 5.5 V

* Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

* ESD protection exceeds 8000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

* Packages offered: LQFP48

## Target Applications

* Add I²C-bus port to controllers/processors that do not have one

* Add additional I²C-bus ports to controllers/processors that need multiple I²C-bus ports

* Converts 8 bits of parallel data to serial data stream to prevent having to run a large number of traces across the entire printed-circuit board

* Entertainment systems

* LED matrix control

* Data intensive I²C-bus transfers

## Features