PCA9671PW,118

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Number of I/O:	16
Interface:	I²C
Interrupt Output:	No
Features:	POR
Output Type:	Push-Pull
Current - Output Source/Sink:	100µA, 25mA
Clock Frequency:	1MHz
Voltage - Supply:	2.3 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	24-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	24-TSSOP
Base Part Number:	PCA9671

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PCA9671PW_118 Application Field and Working Principle

Introduction

The NXP PCA9671PW_118 is an integrated circuit developed by NXP Semiconductors as a medium-speed I/O expander used for applications involving general-purpose digital I/O, memory access, and pulse-width modulation (PWM). It can be interfaced with several hundred digital and analog I/O pins, allowing for high expansion capacity and flexible configuration. The PCA9671PW_118 can be divided into two distinct categories: general-purpose I/O expansion and special-purpose I/O expansion. Its ability to draw power from other I/O boards or supply its own power through a regulated power source allows for increased system flexibility and scalability.

General-Purpose I/O Expansion

The PCA9671PW_118 can be used to expand the number of general-purpose digital I/O pins in the system through its I2C, SPI, UART, or 8/16/24-bit data bus interfaces. This results in a significant increase in the number of discrete and analog inputs and outputs available in the system. The bus interfaces can be used to read and write to different I/O pins, as well as monitor states of existing digital and analog I/O. The I/O pins can be programmatically configured to function as either input or output pins. The I/O pins can also be configured to generate interrupts in response to specific events, such as a pin state transition.

Memory Access

The PCA9671PW_118 can be used to access and control memories, such as SRAM, DRAM, and flash memories, using its 16/24-bit data bus interfaces. This allows for data to be read and written to the memories directly, as well as granting access to the individual addresses, instead of having to utilize the processor\'s memory management unit (MMU). This results in a reduction in the overall processor load, as well as increased system performance.The PCA9671PW_118 also supports block erase operation and other advanced functions, such as read-modify-write and read-while-write.

Pulse-Width Modulation (PWM)

The PCA9671PW_118 supports pulse-width modulation (PWM) to drive controllable digital devices, such as motor drivers or actuators. PWM enables the control of motors and other devices through the use of pulse-width signals. The PCA9671PW_118 features an integrated programmable high-resolution PWM generator, which supports four different PWM channels, with an adjustable duty cycle, period, and resolution. The PCA9671PW_118 also supports up to five programmable dead bands, adaptive phase-shift PWM, and can be used to generate analog signals with a scaling factor of 0.5%.

Conclusion

The NXP PCA9671PW_118 is an advanced I/O expander for applications involving general-purpose digital I/O, memory access, and PWM. The PCA9671PW_118 has the ability to draw power from other I/O boards, reducing the overall processor load and increasing system performance. It can be used to access and control memories, such as SRAM and DRAM, as well as generate PWM signals with adjustable duty cycle, period, and resolution. The NXP’s PCA9671PW_118 I/O expander offers users a high degree of flexibility and scalability in terms of digital I/O, memory access, and PWM applications.

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