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PCA9554ARGVR Datasheet(PDF) 1 Page - Texas Instruments |
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PCA9554ARGVR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 33 page www.ti.com FEATURES DB, DBQ, DGV, DW, OR PW PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A0 A1 A2 P0 P1 P2 P3 GND VCC SDA SCL INT P7 P6 P5 P4 RGV PACKAGE (TOP VIEW) 16 6 8 2 10 P7 4 3 1 7 5 12 11 9 13 14 15 P6 INT SCL A2 P0 P1 P2 RGT PACKAGE (TOP VIEW) 16 6 8 2 10 P7 4 3 1 7 5 12 11 9 13 14 15 P6 INT SCL A2 P0 P1 P2 DESCRIPTION/ORDERING INFORMATION PCA9554A REMOTE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS SCPS127A – SEPTEMBER 2006 – REVISED FEBRUARY 2007 • I2C to Parallel Port Expander • Power-Up With All Channels Configured as Inputs • Open-Drain Active-Low Interrupt Output • No Glitch on Power-Up • Operating Power-Supply Voltage Range of 2.3 V to 5.5 V • Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs • 5-V Tolerant I/Os • Latch-Up Performance Exceeds 100 mA Per • 400-kHz Fast I2C Bus JESD 78, Class II • Three Hardware Address Pins Allow up to • ESD Protection Exceeds JESD 22 Eight Devices on the I2C/SMBus – 2000-V Human-Body Model (A114-A) • Input/Output Configuration Register – 200-V Machine Model (A115-A) • Polarity Inversion Register – 1000-V Charged-Device Model (C101) • Internal Power-On Reset This 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 PCA9554A 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 pull up 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 PCA9554A 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 PCA9554A 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. INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9554A can remain a simple slave device. The device's outputs (latched) have high-current drive capability for directly driving LEDs and low current consumption. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. UNLESS OTHERWISE NOTED this document contains Copyright © 2006–2007, Texas Instruments Incorporated PRODUCTION DATA information current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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