TCA9536DGKR

The TCA9536DGKR is an I2C-based I/O expander from NXP (formerly Philips) that adds extra GPIOs to a microcontroller.
Key points:
- 8 bidirectional general-purpose I/O pins you can configure as inputs or outputs via I2C registers.
- Features include direction control, input status, output latch, optional input polarity inversion, and an interrupt output for change detection.
- I2C interface compatible with standard/fast modes; supply voltage typically 1.65–5.5 V; low power consumption.
- Package suffix DGKR denotes a specific small RoHS package variant used for this device.
- Typical applications: expand MCU I/O for keyboards, LED indicators, sensors, or any GPIO-intensive embedded design.
Usage: connect SCL/SDA to the MCU, power the device, configure pin directions, write/read the appropriate registers, and use the interrupt pin if needed.
For exact pinout, timing, and register details, consult the TCA9536DGKR datasheet.

Direct equivalents:
- NXP PCA9536 — closest direct replacement (I2C 4-bit I/O expander, similar features/pinout).
Near/functional alternatives (different GPIO count or register map; may need software changes):
- Microchip MCP23008 — 8-bit I2C GPIO expander.
- NXP PCF8574 — 8-bit I2C GPIO expander.
For exact mechanical/package matches, check each vendor’s datasheet and ordering codes before redesign.

Concise features of TCA9536DGKR:
- I2C-bus 16-bit I/O expander (two 8-bit bidirectional ports)
- Per-pin I/O direction control (IODIR)
- Separate registers for Output, Input, and optional Polarity Inversion (INVERT)
- Interrupt output (INT), active-low, on input change
- Per-pin polarity inversion and robust I/O control
- Up to 8 devices on the same bus using A0–A2 address pins
- Wide supply voltage: 1.65 V to 5.5 V
- I2C speed support up to 400 kHz (Fast-mode)
- Operating temperature range: -40°C to 85°C
- 16-pin package (DGKR variant), RoHS compliant
Note: This is a concise summary of typical TCA9536 features; verify against the exact datasheet for your product variant.

TCA9536DGKR is supplied in a 14‑pin TSSOP (DGK) package (14 pins). Key pin functions:
- VCC, GND — power supply.
- SDA, SCL — I²C/SMBus data and clock.
- P0–P3 — four configurable GPIO pins (input or output).
- A0, A1, A2 — hardware I²C address‑select inputs.
- INT — open‑drain interrupt/output (logic change notification).
- RESET — device reset input.
- NC/reserved — one or more no‑connect/reserved pins depending on datasheet.
(For exact pin numbering and electrical details, refer to the TI datasheet.)

The TCA9536DGKR is manufactured by Texas Instruments (TI). TI is an American multinational semiconductor company headquartered in Dallas, Texas, that designs and manufactures analog and embedded processing integrated circuits and related components (microcontrollers, analog ICs, power management, interface chips, etc.) for industrial, automotive, consumer and communications markets.

TCA9536DGKR is an I2C I/O expander. Primary application areas:
- Add GPIOs to microcontrollers in space- or pin-constrained designs.
- Drive LEDs/indicators and small displays.
- Read digital inputs: switches, buttons, sensors.
- Keypad scanning and simple relay/low-current load control.
- Use in consumer electronics, home/building automation, and industrial control.
- Prototyping and educational projects needing extra I/O without extra buses.

TCA9536DGKR is supplied in TI’s DGK package: a 14-pin VSSOP (very thin/shrink small-outline) package, with the "R" suffix indicating tape-and-reel packaging.