Overview
The PCF85133U/2DA/1,033 is a universal LCD driver designed by NXP USA Inc. for interfacing with Liquid Crystal Displays (LCDs) that operate at low multiplex rates. This peripheral device is versatile and can drive both static and multiplexed LCDs, supporting up to four backplanes and up to 80 segments. It is compatible with most microcontrollers and communicates via a two-line bidirectional I²C-bus, minimizing communication overhead through features like display RAM with auto-incremental addressing and hardware subaddressing.
Key Specifications
| Specification | Description |
|---|---|
| Interface | Two-line bidirectional I²C-bus |
| Operating Voltage | From 2.5 V for low-threshold LCDs to 6.5 V for guest-host LCDs and high-threshold twisted nematic LCDs |
| Backplane Outputs | Four backplane outputs (BP0 to BP3) |
| Segment Outputs | Up to 80 segment outputs (S0 to S79) |
| Drive Modes | Static or multiplexed drive modes (e.g., 1:4 multiplex) |
| I²C-bus Frequency | Up to 400 kHz |
| Power Consumption | Low power consumption |
| Cascading Capability | Can be cascaded for larger LCD applications (up to 5120 elements possible) |
Key Features
- Single-chip LCD controller and driver
- Selectable backplane drive configuration: static or multiplexed
- Low power consumption
- 400 kHz I²C-bus interface
- Display RAM with auto-incremental addressing and hardware subaddressing
- Display memory switching (static and duplex drive modes)
- Cascading capability for large LCD applications
Applications
The PCF85133U is suitable for a wide range of applications involving LCD displays, including but not limited to:
- Industrial control panels
- Consumer electronics
- Automotive displays
- Medical devices
- Any system requiring a versatile and efficient LCD driver
Q & A
- What is the PCF85133U used for? The PCF85133U is used as a universal LCD driver for interfacing with Liquid Crystal Displays (LCDs) that operate at low multiplex rates.
- How does the PCF85133U communicate with microcontrollers? The PCF85133U communicates via a two-line bidirectional I²C-bus.
- What is the maximum number of segment outputs supported by the PCF85133U? The PCF85133U supports up to 80 segment outputs.
- Can the PCF85133U be cascaded for larger LCD applications? Yes, the PCF85133U can be cascaded for larger LCD applications, supporting up to 5120 elements.
- What are the operating voltage ranges for the PCF85133U? The operating voltage ranges from 2.5 V for low-threshold LCDs to 6.5 V for guest-host LCDs and high-threshold twisted nematic LCDs.
- What are the key features of the PCF85133U's I²C-bus interface? The I²C-bus interface operates at up to 400 kHz and includes features like display RAM with auto-incremental addressing and hardware subaddressing.
- How does the PCF85133U minimize communication overhead? The PCF85133U minimizes communication overhead through display RAM with auto-incremental addressing, hardware subaddressing, and display memory switching.
- What are the typical applications of the PCF85133U? Typical applications include industrial control panels, consumer electronics, automotive displays, and medical devices.
- What happens during the power-on reset of the PCF85133U? During power-on reset, all backplane and segment outputs are set to VLCD, the selected drive mode is reset to 1:4 multiplex with 1/3 bias, and other initializations are performed as specified in the datasheet.
- Can the PCF85133U be used with different types of LCDs? Yes, the PCF85133U can be used with various types of LCDs, including static and multiplexed LCDs, and supports different LCD configurations.
