Texas Instruments PCA9554 overview
Texas Instruments PCA9554 Remote 8-Bit I2C AND SMBus I/O Expander With Interrupt Output and Configuration Registers This 8-bit I/O expander for the two-line bid...
Manufactured byTexas Instruments
Part number or familyPCA9554
Product group8-bit I/O Expander Chipsets
Product details
Manufactured byTexas Instruments
Product group8-bit I/O Expander Chipsets
DescriptionTexas Instruments PCA9554 Remote 8-Bit I2C AND SMBus I/O Expander With Interrupt Output and Configuration Registers
OverviewThis 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].The PCA9554 consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup to VCC. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.The system master can reset the PCA9554 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/ SMBus state machine.The PCA9554 open-drain interrupt ( INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed.
Key FeaturesI2C to Parallel Port Expander Open-Drain Active-Low Interrupt Output Operating Power-Supply Voltage Range of 2.3 V to 5.5 V 5-V Tolerant I/Os 400-kHz Fast I2C Bus Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus Input/Output Configuration Register Polarity Inversion Register Internal Power-On Reset Power-Up With All Channels Configured as Inputs No Glitch On Power Up Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II ESD Protection Exceeds JESD 22– 2000-V Human-Body Model (A114-A)– 200-V Machine Model (A115-A)– 1000-V Charged-Device Model (C101)
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Texas Instruments
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8-bit I/O Expander Chipsets
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