PCA9555| Datasheet

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PCA9555
www.ti.com ......................................................................................................................................................... SCPS131E AUGUST 2005 REVISED MAY 2008

REMOTE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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FEATURES
Low Standby-Current Consumption of 1 uA Max I2C to Parallel Port Expander Open-Drain Active-Low Interrupt Output 5-V Tolerant I/O Ports Compatible With Most Microcontrollers 400-kHz Fast I2C Bus Address by Three Hardware Address Pins for Use of up to Eight Devices
DB, DBQ, DGV, DW, OR PW PACKAGE (TOP VIEW)

Polarity Inversion Register Latched Outputs With High-Current Drive 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)
RGE PACKAGE (TOP VIEW)

INT A1 A2 P00 P01 P02 P03 P04 P05 P06 P07 GND

1 2 3 4 5 6 7 8 9 10 11 12

24 23 22 21 20 19 18 17 16 15 14 13

VCC SDA SCL A0 P17 P16 P15 P14 P13 P12 P11 P10

24 23 22 21 20 19

SDA SCL
18 A0 17 P17 16 P16 15 P15 14 P14 13 P13

P00 P01 P02 P03 P04 P05

1 2 3 4 5 6 7 8 9 10 11 12

DESCRIPTION/ORDERING INFORMATION
This 16-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 PCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low operation) registers. At power on, the I/Os are configured as inputs. 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 PCA9555 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 I
2C/SMBus state machine. The PCA9555 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 PCA9555 can remain a simple slave device.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

A2 A1 INT VCC