Overview
The PCA9530D,112 is a 2-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in 256 discrete steps. It is particularly suited for Red/Green/Blue (RGB) color mixing and backlight applications. The device contains an internal oscillator with two user-programmable blink rates and duty cycles, allowing for precise control over LED brightness and blinking patterns.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD supply voltage | 2.3 | - | 5.5 | V |
| IDD supply current (operating mode) | - | - | - | mA |
| Output current per channel | - | - | 25 | mA |
| Clock frequency | 0 | - | 400 | kHz |
| Operating temperature | -40 | - | 85 | °C |
| Blink rate frequency | 0.591 | - | 152 | Hz |
| Brightness steps | - | - | 256 | - |
Key Features
- 2 LED drivers with programmable on, off, and blinking at two selectable rates
- 256 brightness steps for each LED
- Internal oscillator requiring no external components
- I2C-bus interface logic compatible with SMBus
- Active LOW reset input (RESET) and Power-On Reset (POR)
- Two open-drain outputs directly driving LEDs up to 25 mA
- Edge rate control on outputs and no glitch on power-up
- Supports hot insertion and low standby current
- ESD protection exceeds 2000 V HBM, 150 V MM, and 1000 V CDM
Applications
- RGB color mixing and backlight applications
- LED dimming and brightness control
- Sensors, push buttons, and alarm monitoring
- Fans and other low-current devices
- General-purpose GPIO expansion for microcontrollers
Q & A
- Q: What is the PCA9530D,112 used for?
A: The PCA9530D,112 is used for dimming LEDs in 256 discrete steps, particularly for RGB color mixing and backlight applications.
- Q: What is the range of the supply voltage for the PCA9530D,112?
A: The supply voltage range is from 2.3 V to 5.5 V.
- Q: How many brightness steps does the PCA9530D,112 support?
A: It supports 256 brightness steps for each LED.
- Q: What is the maximum output current per channel for the PCA9530D,112?
A: The maximum output current per channel is 25 mA.
- Q: Does the PCA9530D,112 support hot insertion?
A: Yes, it supports hot insertion.
- Q: What is the clock frequency range of the I2C-bus interface?
A: The clock frequency range is from 0 Hz to 400 kHz.
- Q: How many devices can be addressed on the same I2C bus using the PCA9530D,112?
A: Two devices can be addressed on the same bus using the hardware address pin.
- Q: What type of reset does the PCA9530D,112 have?
A: It has an active LOW hardware reset pin (RESET) and a Power-On Reset (POR).
- Q: Does the PCA9530D,112 have ESD protection?
A: Yes, it has ESD protection exceeding 2000 V HBM, 150 V MM, and 1000 V CDM.
- Q: Can the PCA9530D,112 be used as a general-purpose GPIO expander?
A: Yes, the inputs/outputs not used as LED drivers can be used as regular GPIOs.
