PCA9535BS1,118

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Number of I/O:	16
Interface:	I²C, SMBus
Interrupt Output:	Yes
Features:	POR
Output Type:	Push-Pull
Current - Output Source/Sink:	10mA, 25mA
Clock Frequency:	400kHz
Voltage - Supply:	2.3 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	24-WFQFN Exposed Pad
Supplier Device Package:	24-HWQFN (4x4)
Base Part Number:	PCA9535

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Introduction of PCA9535BS1,118 Interface-I/O Expanders

PCA9535BS1,118 is an interface-I/O expander, a mixed signal device. It is a 8-bit I/O expander for the two-line bidirectional bus (I2C-bus). This I2C-bus 16-bit I/O expander provides general-purpose remote I/O expansion for most microcontroller families. It can be programmed individually to operate in input, output or open drain modes via the I2C-bus.

Features of PCA9535BS1,118

The PCA9535BS1,118 has many features, including:

• Eight bit programmable I/O ports.
• Two port registers, two input registers and two polarity inversion registers.
• Configurable interrupt output pins.
• Programmable I/O port direction.
• Open drain output state transfer.
• SMBus Compability.
• I2C bus protocol compliant.
• Low power CMOS technology.
• 2.7V to 5.5V single supply.

Application Field of PCA9535BS1,118

PCA9535BS1,118 can be used for control buttons in small systems, user input devices, data acquisition systems, domestic appliances and automation systems, and it is a suitable choice for many other applications. It can acquire the system with much fewer I/O lines than would usually be required, therefore saving system cost.

Working Principle of PCA9535BS1,118

When the PCA9535BS1,118 receives data on its I2C-bus, it copes with the data according to the instruction set. The instruction set provides the user to control the internal registers of the device which include configuration, direction and polarity registers. It has 3-state type output stages which allow either the active low or active high outputs. It has two general purpose input/output (GPIO) port registers, two input port registers, two output port registers and two polarity inversion registers.The input port and output port registers of the PCA9535BS1,118 are configured via the I2C-bus. When the device is configured to be in the input mode, the state of the pins is determined by the status of the input port register. When the device is configured to be in the output mode, the state of the pins is determined by the status of the output port register. In the polarity inversion register, setting a bit in the register conditions the corresponding output port register bit to be inverted before being applied to the output pin.For the interrupt output functionality of the PCA9535BS1,118, when an input port pin is configured as an interrupt output pin, the AND Operations result of the polarity and input port register is used to generate an interrupt output signal.

Conclusion

PCA9535BS1,118 provides a cost-effective solution for remote I/O management. It offers flexibility and ease of use via I2C-bus communication, making it suitable for control buttons, user input devices, data acquisition systems, domestic appliances and automation systems, and many other applications. It is indeed a very useful device for remote I/O management and control.

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