PCA9674AD数据手册恩XP中文资料规格书

描述 Description

The PCA9674 and PCA9674A provides general purpose remote I/O expansion via the two-line bidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 1 MHz I²C‑bus Fast-mode Plus(Fm+) family interface, with high speed data transfer it can support PWM dimming ofLEDs, and higher I²C‑bus drive 30 mA for more devices can be on the bus without theneed for bus buffers. Three hardware address inputs and interrupt output operatingbetween 2.3 V and 5.5 V. The quasi-bidirectional port can be independently assigned asan input to monitor interrupt status or keypads, or as an output to activate indicatordevices such as LEDs. The system master can read from the input port or write to theoutput port through a single register.
The low current consumption of 4.5 μA (typical, static) is great for mobile applications andthe latched output ports have 25 mA high current sink drive capability for directly drivingLEDs.
The PCA9674 and PCA9674A are identical except for the different, non-overlapping slaveaddress. The three hardware selectable address pins can be decode to 64 addresses forthe PCA9674 and 62 addresses for the PCA9674A, so there can be up to 126 of these I/Oexpanders PCA9674/74A together on the same I²C‑bus without the need for bus buffers,supporting up to 1008 I/Os (for example, 1008 LEDs).
The active LOW open-drain interrupt output (INT) can be connected to the interrupt logicof the microcontroller and is activated when any input state differs from its correspondinginput port register state. It is used to indicate to the microcontroller that an input state haschanged and the device needs to be interrogated without the microcontroller continuouslypolling the input register via the I²C‑bus.
The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internalpull-up 100 μA current source.

特性 Features

I²C-bus to parallel port expander
1 MHz I²C-bus interface (Fast-mode Plus I²C‑bus)
SDA with 30 mA sink capability for 4000 pF buses
Operating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to VDD with 100 μA current source
8-bit remote I/O pins that default to inputs at power-up
Latched outputs with 25 mA sink capability for directly driving LEDs
Total package sink capability of 200 mA
Active LOW open-drain interrupt output
Sixty-four programmable slave addresses using 3 address pins (PCA9674A - sixty-two)
Readable device ID (manufacturer, device type, and revision)
Low standby current (4.5 μA typical)
-40 °C to +85 °C operation
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
Packages offered: SO16, TSSOP16, HVQFN16

应用 Application

LED signs and displays
Servers
Key pads
Industrial control
Medical equipment
PLCs
Cellular telephones
Mobile devices
Gaming machines
Instrumentation and test measurement