Overview
The PCA9532D112, produced by NXP USA Inc., is a 16-bit I²C-bus and SMBus I/O expander specifically optimized for dimming LEDs. This component is designed to control LED brightness in 256 discrete steps, making it ideal for applications such as Red/Green/Blue (RGB) color mixing and backlighting. The PCA9532 features an internal oscillator with two user-programmable blink rates and duty cycles, allowing for precise control over LED dimming and blinking effects.
Key Specifications
| Specification | Details |
|---|---|
| Package Type | SO24 (plastic small outline package; 24 leads; body width 7.5 mm) |
| Operating Voltage | 2.3 V to 5.5 V |
| Temperature Range | -40°C to +85°C |
| LED Drivers | 16 LED drivers with on, off, and flashing capabilities |
| Blink Rates | Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.591 Hz and 152 Hz |
| Brightness Steps | 256 discrete brightness steps |
| I²C-Bus Interface | Compatible with SMBus, clock frequency range of 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114, 150 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101 |
| Reset | Active LOW hardware reset pin and Power-On Reset (POR) |
| Addressing | Three hardware address pins allowing eight devices to operate on the same bus |
Key Features
- 16-bit I²C-bus and SMBus I/O expander optimized for LED dimming
- Internal oscillator with two user-programmable blink rates and duty cycles
- 256 discrete brightness steps for precise LED control
- Input/outputs not used as LED drivers can be used as regular GPIOs
- No external components required for the internal oscillator
- Noise filter on SCL/SDA inputs and controlled edge rates to minimize ground bounce
- Active LOW reset input and Power-On Reset (POR)
- 16 open-drain outputs directly drive LEDs to 25 mA
- Low standby current and support for hot insertion
- ESD protection and latch-up testing exceeding industry standards
Applications
- RGB color mixing and backlighting in various display systems
- LED lighting in automotive, industrial, and consumer electronics
- ACPI power switches, sensors, push-buttons, alarm monitoring, and fan control
- General-purpose I/O expansion in embedded systems
Q & A
- What is the PCA9532D112 used for?
The PCA9532D112 is used for dimming LEDs in 256 discrete steps and is optimized for applications such as RGB color mixing and backlighting.
- What are the key features of the PCA9532D112?
Key features include a 16-bit I²C-bus and SMBus I/O expander, internal oscillator, 256 brightness steps, and two programmable blink rates.
- What is the operating voltage range of the PCA9532D112?
The operating voltage range is from 2.3 V to 5.5 V.
- What is the temperature range for the PCA9532D112?
The temperature range is -40°C to +85°C.
- How many LED drivers does the PCA9532D112 have?
The PCA9532D112 has 16 LED drivers.
- What is the clock frequency range of the I²C-bus interface?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9532D112 have ESD protection?
- How does the PCA9532D112 handle reset?
- Can multiple PCA9532D112 devices operate on the same bus?
- What are some common applications of the PCA9532D112?
