Overview
The PCF8575DBQR, produced by Texas Instruments, is a 16-bit I2C/SMBus I/O expander designed for remote I/O expansion in various microcontroller-based systems. This device operates within a voltage range of 2.5V to 5.5V and is compatible with most microcontrollers. It features a quasi-bidirectional input/output port, allowing each I/O to be used as either an input or output without the need for a data-direction control signal. At power-on, all I/Os are set to high, with only a current source to VCC active.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SSOP (DBQ), 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage (VCC) | 2.5V to 5.5V |
| I2C Bus Speed | Up to 400 kHz |
| Addressing | Three hardware address pins for up to eight devices |
| Standby Current Consumption | 10 µA maximum |
| ESD Protection | 2000V Human-body model, 200V Machine model, 1000V Charged-device model |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II |
Key Features
- I2C to parallel-port expander
- Open-drain interrupt output
- Low standby-current consumption of 10 µA maximum
- Compatible with most microcontrollers
- 400 kHz Fast I2C bus
- Address by three hardware address pins for use of up to eight devices
- Latched outputs with high-current drive capability for directly driving LEDs
- Current source to VCC for actively driving a high at the output
- ESD protection exceeds JESD 22 standards
Applications
- Telecom shelters and filter units
- Servers and routers (telecom switching equipment)
- Personal computers and personal electronics
- Industrial automation
- Products with GPIO-limited processors
Q & A
- What is the PCF8575DBQR used for? The PCF8575DBQR is used for remote I/O expansion in microcontroller-based systems.
- What is the operating voltage range of the PCF8575DBQR? The operating voltage range is 2.5V to 5.5V.
- How many I/O ports does the PCF8575DBQR have? The PCF8575DBQR has 16 quasi-bidirectional I/O ports.
- What is the maximum I2C bus speed of the PCF8575DBQR? The maximum I2C bus speed is 400 kHz.
- How many devices can be addressed using the PCF8575DBQR? Up to eight devices can be addressed using three hardware address pins.
- What is the standby current consumption of the PCF8575DBQR? The standby current consumption is 10 µA maximum.
- Does the PCF8575DBQR have ESD protection? Yes, it exceeds JESD 22 standards with 2000V Human-body model, 200V Machine model, and 1000V Charged-device model.
- Can the PCF8575DBQR drive LEDs directly? Yes, it has latched outputs with high-current drive capability for directly driving LEDs.
- What is the latch-up performance of the PCF8575DBQR? It exceeds 100 mA per JESD 78, Class II.
- What are some common applications of the PCF8575DBQR? Common applications include telecom shelters, servers, routers, personal computers, personal electronics, and industrial automation.
