Texas Instruments BUF16821BIPWPR

Overview

BUF16821BIPWPR from Texas Instruments is a programmable gamma-voltage generator and VCOM calibrator with 16 gamma output channels, 2 VCOM outputs, 10-bit resolution, rail-to-rail analog output swing (≤300 mV from rails at 10 mA), and dual independent nonvolatile memory banks for dynamic gamma curve switching in TFT-LCD timing controllers.

For engineers reviewing the BUF16821BIPWPR datasheet, BUF16821BIPWPR pinout, BUF16821BIPWPR application, or BUF16821BIPWPR equivalent, this device supports I²C interface up to 3.4 MHz, operates from 9V–20V analog supply and 2.0V–5.5V digital supply, delivers >300 mA peak VCOM output current, and enables factory calibration and panel rework via 16-programmable OTP write cycles.

Technical Context

The BUF16821BIPWPR integrates sixteen 10-bit DACs for gamma reference generation and two high-current DACs for VCOM calibration, all controlled via an I²C interface supporting standard (400 kHz), fast, and high-speed (3.4 MHz) modes. Its dual-bank nonvolatile memory allows simultaneous storage of two distinct gamma curves, selected by the BKSEL pin.

Each gamma channel delivers rail-to-rail output with ≤300 mV swing-to-rail at 10 mA load; VCOM1/VCOM2 outputs are rated for ≥100 mA sourcing/sinking (BUF16821B variant). The device features on-chip parity error correction for OTP memory reliability and requires strict power sequencing (digital supply applied before analog supply).

Key Specifications

Pinout & Package

BUF16821BIPWPR is housed in a 28-pin HTSSOP PowerPAD™ package (PWP), featuring an exposed thermal pad that must be soldered to PCB ground for thermal management and electrical stability. Pin count and layout match TI's BUF16821A/BUF16821B family specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gamma and VCOM reference generation applications.

Compared with BUF16821AIPWPR, BUF16821BIPWPR trades VCOM voltage headroom for tighter internal output limiting and reduced system-level calibration complexity; compared with BUF20820RTWR, it provides integrated VCOM functionality and direct pin compatibility within the BUF16821 family, simplifying board reuse.

Availability

BUF16821BIPWPR is available at Aetrix Electronics and suitable for TFT-LCD reference drivers, industrial HMI calibration systems, and broadcast monitor gamma management requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for BUF16821BIPWPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in high-voltage precision analog ICs for display and industrial applications.

BUF16821BIPWPR belongs to TI's programmable gamma buffer product line, designed specifically for TFT-LCD timing controller reference generation, VCOM calibration, and factory/field panel tuning in high-reliability display systems.

FAQ

What is the key functional difference between BUF16821BIPWPR and BUF16821AIPWPR?

The BUF16821BIPWPR features internally limited VCOM output swing (e.g., 8.96 V high at 100 mA, 6.75 V low at 100 mA), whereas the BUF16821AIPWPR delivers higher VCOM swing (13–16.2 V high, 0.6–2 V low at 100 mA). This makes BUF16821BIPWPR suitable for lower-analog-supply panels with tighter VCOM voltage margins, while BUF16821AIPWPR targets wider-range applications. Both share identical pinout, memory architecture, and I²C interface.

How does the BKSEL pin affect operation of the BUF16821BIPWPR?

The BKSEL pin selects between two independent nonvolatile memory banks: logic LOW selects BANK0, and logic HIGH selects BANK1. At power-up or after BKSEL state change, the BUF16821BIPWPR acquires the last programmed gamma and VCOM values from the selected bank into its volatile DAC registers. This enables hardware-triggered gamma curve switching without I²C communication, achieving sub-100 μs transition times in real-time display applications.

What is the maximum continuous output current per gamma channel on the BUF16821BIPWPR?

The BUF16821BIPWPR specifies a continuous output current of 30 mA per gamma channel (OUT1–OUT16) under normal operating conditions. This rating ensures stable operation into typical 1.5 kΩ source driver reference inputs while maintaining ≤300 mV swing-to-rail performance at 10 mA load. Exceeding 30 mA continuously may impact thermal performance and long-term reliability.

Does the BUF16821BIPWPR support high-speed I²C mode, and what is required to enable it?

Yes, the BUF16821BIPWPR supports I²C high-speed mode up to 3.4 MHz. To enable it, the master must transmit a special Hs master code (00001xxx, where xxx is master-specific) immediately after the START condition and before the device address byte. The BUF16821BIPWPR switches to high-speed mode upon receiving this code and remains in that mode until the next STOP condition. No acknowledgment is sent for the Hs master code.

How many times can the nonvolatile memory of the BUF16821BIPWPR be rewritten, and is parity protection active?

The BUF16821BIPWPR supports up to 16 write cycles per memory bank (BANK0 or BANK1), with guaranteed 100-year data retention. Each gamma and VCOM channel's OTP memory includes single-bit parity error correction: if one bit fails, the BUF16821BIPWPR automatically corrects it during memory acquisition; multi-bit errors default to reset value (1000000000). Parity is always active and requires no user configuration.