Infineon BA595E6327: Technical Datasheet, Application Circuit, and Pin Configuration Overview

The Infineon BA595E6327 is a versatile and robust 8-bit shift register and latch designed for a wide range of applications, particularly in driving high-current loads such as LEDs, relays, and incandescent lamps. This device integrates a serial-in, parallel-out shift register with a built-in data latch, providing an efficient solution for minimizing microcontroller I/O pin usage while controlling multiple outputs.

Technical Datasheet Overview

Key electrical characteristics and absolute maximum ratings define the operational boundaries of the BA595E6327. The device operates within a supply voltage range of 3.0V to 5.5V, making it compatible with both 3.3V and 5V logic systems. Each output channel can sink up to 100mA of continuous current, with a maximum power dissipation of 1.5W. The integrated Darlington transistor outputs feature high-voltage capability (up to 50V) and clamp diodes for inductive load protection, simplifying external circuit design. Operating temperature ranges from -40°C to +125°C, ensuring reliability in harsh environments.

Pin Configuration and Function

The IC is housed in a standard 16-pin SOIC package. Understanding its pinout is crucial for proper circuit integration:

Pins 1-8 (Output 1 to Output 8): These are the parallel output pins capable of sinking significant current.

Pin 9 (GND): Ground reference for the IC.

Pin 10 (VCC): Positive supply voltage input.

Pin 11 (CLK): The clock input for the shift register. Data is shifted on the low-to-high transition of this signal.

Pin 12 (LATCH): Latch pin. On a low-to-high transition, the data in the shift register is transferred to the output latches.

Pin 13 (OE): Output Enable (active low). This pin controls the outputs; a low level enables them, while a high level forces all outputs into a high-impedance off state.

Pin 14 (DATA IN): Serial data input.

Pin 15 (CLR): Clear input (active low). When pulled low, it asynchronously clears the shift register, setting all outputs low.

Pin 16 (VCC): Positive supply voltage input (connected internally to Pin 10).

Application Circuit

A typical application circuit for driving a series of LEDs is straightforward. The microcontroller uses only three GPIO pins: one for serial data (connected to DATA IN), one for the clock (CLK), and one for the latch (LATCH). The OE pin can be tied to GND for always-enabled outputs or connected to a PWM-capable microcontroller pin for global brightness control via pulse-width modulation. The CLR pin is typically pulled high to VCC through a resistor if not used. Each output pin is connected to the cathode of an LED, with the anode connected to a positive supply via a current-limiting resistor. The built-in clamp diodes allow the IC to directly drive inductive loads like small relays without requiring external flyback diodes.

ICGOODFIND Summary

The Infineon BA595E6327 is a highly efficient and reliable integrated solution for expanding output capabilities in digital systems. Its high-current sink outputs, simple 3-wire serial interface, and integrated protection features make it an excellent choice for designers seeking to reduce component count and simplify board layout in applications ranging from industrial control panels and automotive clusters to general-purpose LED displays.

Keywords: Shift Register, High-Current Driver, Serial-to-Parallel Converter, Latch Output, LED Driver.