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The HT16C22 is a RAM Mapping 20×4 LCD Controller Driver IC manufactured by HOLTEK. Below are its specifications, descriptions, and features:

Specifications:

• Package: 48LQFP (Low-profile Quad Flat Package)
• Operating Voltage: 2.4V to 5.5V
• Display Segments: 20 segments × 4 commons
• Interface: I²C (400kHz max)
• Internal RAM: 20×4 bits
• Built-in RC Oscillator
• Low Power Consumption:
• Operating Current: 60μA (typical)
• Standby Current: <1μA
• Temperature Range: -40°C to +85°C

Descriptions:

• The HT16C22 is a memory-mapping LCD controller/driver designed for driving small to medium-sized LCD panels.
• It supports a 20×4 display configuration (20 segments × 4 commons).
• Communication is achieved via an I²C interface, simplifying connection to microcontrollers.
• Includes an internal RC oscillator, eliminating the need for an external clock source.
• Suitable for battery-powered and low-power applications due to its low current consumption.

Features:

• I²C Interface (slave mode, 7-bit address)
• Adjustable LCD Bias Voltage (1/2 or 1/3 bias)
• Software Configurable Display Settings (on/off, blinking)
• Wide Operating Voltage Range (2.4V–5.5V)
• Built-in Power-On Reset (POR)
• Supports Multiple Display Modes (static, 1/2 duty, 1/3 duty, 1/4 duty)
• High Noise Immunity

The HT16C22 is commonly used in industrial control panels, instrumentation, consumer electronics, and portable devices requiring low-power LCD driving.

For detailed electrical characteristics and timing diagrams, refer to the official HOLTEK datasheet.