NXP Semiconductors PCA9564BS,118

Overview

PCA9564BS,118 from NXP Semiconductors (formerly Philips Semiconductors) is a parallel-bus-to-I²C-bus protocol converter IC that enables standard 8-bit parallel microcontrollers (e.g., 80C51-compatible) to interface with I²C-bus peripherals. It operates as both master and slave, supports 2.3–3.6 V supply, features an internal 9 MHz oscillator, and delivers up to 360 kHz master-mode I²C clock rate. It is used in embedded systems requiring low-voltage I²C expansion without external timing components.

For engineers reviewing the PCA9564BS,118 datasheet, PCA9564BS,118 pinout, PCA9564BS,118 application, or PCA9564BS,118 equivalent, this device serves as a drop-in upgrade path from PCF8584 for 2.3–3.6 V systems, provides 5 V-tolerant parallel I/Os, supports interrupt- or polled-mode host control, and implements full I²C arbitration, START/STOP generation, and timeout protection - critical for robust multi-master bus designs.

Technical Context

The PCA9564BS,118 integrates a complete I²C serial interface engine with parallel-bus register mapping, eliminating need for external clock sources via its internal 9 MHz oscillator. It implements all I²C protocol sequences - including arbitration, START/STOP, ACK/NACK, and clock stretching - in hardware, with status-driven interrupt signaling via the INT pin.

It supports four operational modes (Master Transmitter, Master Receiver, Slave Receiver, Slave Transmitter) controlled through five memory-mapped registers (I2CSTA, I2CTO, I2CDAT, I2CADR, I2CCON), selected by A0/A1 address lines. The time-out register (I2CTO) enables configurable SCL-low detection (up to ~12.8 ms), preventing bus lock-up during contention or fault conditions.

Key Specifications

Pinout & Package

PCA9564BS,118 is housed in a 20-pin HVQFN package (SOT662-1) with exposed thermal pad. Pin functions are identical across DIP/SO/TSSOP/HVQFN variants per datasheet Figure 1 and PIN DESCRIPTION table. All pins except DNU are electrically active; VSS must be connected to ground, and the exposed pad requires soldering to a thermal PCB pad with vias for proper thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar parallel-to-I²C interface applications.

Compared with PCF8584T, PCA9564BS,118 enables lower-voltage, higher-speed, and more robust I²C interfacing; compared with TCA9564APWR, it shares core functionality but lacks AEC-Q100 qualification - making PCA9564BS,118 optimal for industrial and medical applications where extended temp rating is not required.

Availability

PCA9564BS,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical patient monitor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PCA9564BS,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in I²C and system-bus interface IP.

The PCA9564 product line was developed by Philips Semiconductors (now NXP) to replace the PCF8584 with enhanced low-voltage operation, integrated timing, and improved bus reliability - targeting embedded systems needing cost-effective, robust parallel-to-I²C bridging.

FAQ

What is the primary function of the PCA9564BS,118?

The PCA9564BS,118 is a parallel-bus-to-I²C-bus controller IC that enables 8-bit microcontrollers without native I²C hardware to communicate with I²C peripherals. It operates as both master and slave, handles all I²C protocol details in hardware, and uses an internal oscillator - eliminating external timing components. Its role is to translate parallel read/write operations into compliant I²C transactions.

Does the PCA9564BS,118 require an external crystal or oscillator?

No, the PCA9564BS,118 contains an internal 9 MHz oscillator used for all I²C timing generation. This eliminates the need for external crystals, capacitors, or clock sources. After setting the ENSIO bit, the oscillator requires up to 500 µs to stabilize before I²C operations begin - a key timing parameter for initialization routines in the host firmware.

How does the PCA9564BS,118 handle I²C bus contention or lock-up conditions?

The PCA9564BS,118 implements hardware-based time-out protection via its I2CTO register. When enabled, it monitors SCL low-time and resets the I²C state machine if SCL remains low longer than (I2CTO[6:0] + 1) × 113.7 µs. This prevents permanent bus hang during slave faults or arbitration loss - a critical reliability feature absent in earlier devices like the PCF8584.

Is the PCA9564BS,118 pin-compatible with the PCF8584?

No, the PCA9564BS,118 is not footprint-compatible with the PCF8584. Although functionally similar, it uses different pin assignments (e.g., dedicated INT output, relocated A0/A1), operates at lower voltage (2.3–3.6 V vs. 4.5–5.5 V), and lacks "Snoop" and long-distance modes. Migration requires PCB layout revision and firmware adaptation to the updated register map and timing behavior.

What are the key differences between PCA9564BS,118 and TCA9564APWR?

The PCA9564BS,118 and TCA9564APWR share identical pinout, register structure, electrical specifications, and functional behavior. The main difference is qualification: TCA9564APWR is AEC-Q100 Grade 2 qualified (–40 °C to +105 °C) for automotive use, while PCA9564BS,118 is rated for –40 °C to +85 °C and targets industrial/medical applications. Both are manufactured by NXP and TI respectively under cross-licensed IP.