ChongMing Group (HK) Int'l Co., Ltd |
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PCA9555PWR PCA9555RGER UART Interface IC I/O Expanders Remote 16-Bit I2C & SMBus I/O Expander
1 Features
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
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)
2 Applications
Servers
Routers (Telecom Switching Equipment)
Personal Computers
Personal Electronics
Industrial Automation Equipment
Products with GPIO-Limited Processors
3 Description
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.
Device Information
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
PCA9555 | SSOP (24) DB | 8.20 mm × 5.30 mm |
SSOP (24) DBQ | 8.65 mm × 3.90 mm | |
TVSOP (24) DGV | 5.00 mm x 4.40 mm | |
SOIC (24) DW | 15.4 mm x 7.50 mm | |
SSOP (24) PW | 7.80 mm x 4.40 mm | |
VQFN (24) RGE | 4.00 mm x 4.00 mm |