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Texas Instruments BUF16821AIPWPR
- Part No.:
- BUF16821AIPWPR
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BUF16821AIPWPR.pdf
- Description:
- IC AMP TFT-LCD 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
BUF16821AIPWPR from Texas Instruments is a programmable gamma-voltage generator and VCOM calibrator with 16 gamma output channels (OUT1–OUT16), two VCOM channels (VCOM1/VCOM2), 10-bit DAC resolution, rail-to-rail analog output swing (≤300 mV from rails at 10 mA), and dual independent nonvolatile memory banks (BANK0/BANK1) supporting up to 16 write cycles each. It serves as a reference driver in TFT-LCD timing controller systems requiring precise grayscale and common voltage calibration.
For engineers reviewing the BUF16821AIPWPR datasheet, BUF16821AIPWPR pinout, BUF16821AIPWPR application, or BUF16821AIPWPR equivalent, this device is selected for high-accuracy LCD panel gamma tuning, dynamic gamma curve switching, VCOM drift compensation, and production-level calibration traceability - all via I²C interface (up to 3.4 MHz) and stable 9V–20V analog supply operation.
Technical Context
The BUF16821AIPWPR implements a double-buffered 10-bit DAC architecture with OTP-based nonvolatile memory, enabling atomic updates of gamma/VCOM values without output glitching. Its two independent memory banks allow real-time switching between pre-stored gamma curves using the BKSEL pin.
All 16 gamma outputs and both VCOM outputs are internally buffered, support rail-to-rail operation (17.7 V high / 0.07 V low at 10 mA load), and feature ±20 mV output accuracy over –40°C to +85°C. The device uses a proprietary high-voltage CMOS process enabling 20 V analog supply tolerance and integrated ESD protection (HBM: 3000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gamma Channels | 16 independent programmable outputs (OUT1–OUT16) for grayscale voltage references |
| VCOM Channels | 2 dedicated programmable outputs (VCOM1/VCOM2) for LCD common electrode bias calibration |
| DAC Resolution | 10-bit (1024-step) precision enabling fine-grained gamma curve definition |
| Analog Supply Range | 9 V to 20 V - supports standard TFT-LCD panel power rails without external regulation |
| Digital Supply Range | 2.0 V to 5.5 V - compatible with 3.3 V or 5 V logic domains |
| I²C Interface Speed | Up to 3.4 MHz (high-speed mode) - enables rapid factory calibration and dynamic gamma updates |
| Nonvolatile Memory | Two independent banks (BANK0/BANK1), 16 write cycles per bank, 100-year data retention |
Pinout & Package
BUF16821AIPWPR is housed in an HTSSOP-28 PowerPAD™ package (PWP designation), featuring exposed thermal pad on underside for enhanced heat dissipation. Pin 1 is VCOM2; pins 8 and 18 are GNDA/GNDD (must be connected together); pins 9 and 23 are VS (analog supply); pin 13 is VSD (digital supply); pins 14/15 are SCL/SDA (open-drain I²C); pin 16 is A0 (I²C address select); pin 17 is BKSEL (memory bank selection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | VCOM2 / VCOM1 | Dedicated high-current VCOM outputs (up to 100 mA sink/source) for LCD panel common voltage calibration |
| 2–7, 10–12, 19–22, 25–27 | OUT1–OUT16 | 16 gamma reference outputs with rail-to-rail drive capability (300 mV min swing-to-rail at 10 mA) |
| 8, 18, 24 | GNDA / GNDD | Analog/digital ground terminals - must be shorted externally to minimize noise coupling |
| 9, 23 | VS | Analog supply input (9 V–20 V) powering all gamma/VCOM buffers and internal circuitry |
| 13 | VSD | Digital supply input (2.0 V–5.5 V) powering I²C interface and control logic |
| 14, 15 | SCL / SDA | Open-drain I²C bus interface - requires external pull-ups; supports 400 kHz fast-mode and 3.4 MHz high-speed mode |
| 16 | A0 | I²C slave address bit - sets device address to 0x74 (A0 = LOW) or 0x75 (A0 = HIGH) |
| 17 | BKSEL | Memory bank select - LOW selects BANK0, HIGH selects BANK1 for gamma/VCOM value acquisition |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Guaranteed ≤300 mV from supply rails at 10 mA load - ensures full grayscale range utilization in wide-VS LCD panels |
| Dual independent memory banks | Enables seamless runtime switching between two distinct gamma curves (e.g., daylight vs. night mode) without firmware intervention |
| 16× OTP write cycles per bank | Supports factory rework, panel-specific calibration iteration, and field update flexibility without memory wear-out concerns |
| Single-bit parity error correction | Automatically corrects single-bit failures in nonvolatile memory - maintains calibration integrity over product lifetime |
| High-speed I²C (3.4 MHz) | Reduces calibration time during mass production - critical for high-throughput LCD module test lines |
Applications
| Industrial TFT-LCD Panels | Medical Imaging Displays |
|---|---|
|
Use Scenario: Calibration of 10.4″–24″ industrial HMI panels operating across –40°C to +85°C ambient range with wide-input power supplies. IC Role / Device Role / Timing Role: Gamma reference generator and VCOM calibrator providing stable, temperature-compensated grayscale voltages synchronized to timing controller frame rate. Use Value: Eliminates external resistor ladders and manual trim pots; enables one-time factory programming and field recalibration via I²C. |
Use Scenario: High-fidelity grayscale reproduction in diagnostic ultrasound and MRI monitors where ΔE < 2 color accuracy is mandated. IC Role / Device Role / Timing Role: Precision 10-bit gamma buffer delivering consistent luminance steps across 1024 gray levels under varying panel aging conditions. Use Value: Maintains DICOM GSDF compliance through programmable VCOM drift compensation and dual-bank gamma curve backup. |
| Automotive Infotainment Screens | POS/Kiosk Display Modules |
|
Use Scenario: Sunlight-readable 7″–12″ automotive center-stack displays requiring dynamic gamma adjustment based on ambient light sensor input. IC Role / Device Role / Timing Role: Programmable gamma/VCOM IC interfacing directly with MCU over I²C to adapt gamma curves in real time. Use Value: Enables smooth transition between daylight/night gamma modes using BKSEL pin toggle - no software reload required. |
Use Scenario: Cost-sensitive retail kiosk displays with fixed gamma requirements but variable panel batches requiring individual calibration. IC Role / Device Role / Timing Role: Factory-programmable reference driver storing panel-specific gamma/VCOM values in nonvolatile memory for zero-touch assembly. Use Value: Reduces BOM count by replacing discrete op-amp networks; supports 16 unique panel variants via bank-selectable OTP storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable gamma/VCOM driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF16821BIPWPR | VCOM output swing limited internally (bits 9–7 fixed to '011'); lower max VCOM high-level output (8.96 V vs. 13 V typical for A version) | Targeted for lower-VS LCD panels (e.g., 12 V systems); not suitable for 18 V+ gamma reference rails | Select BUF16821BIPWPR only when analog supply ≤15 V and VCOM current < 100 mA is sufficient. |
| BUF20820RTWR | 20-channel gamma + VCOM with integrated memory; higher channel count but no BKSEL bank-switching; different pinout and I²C command set | Used in larger-format displays (e.g., 32″ commercial signage); lacks real-time dual-curve switching capability | Choose BUF20820RTWR when >16 gamma channels are needed and bank-select functionality is unnecessary. |
Compared with BUF16821BIPWPR and BUF20820RTWR, the BUF16821AIPWPR uniquely delivers 16-channel gamma + dual VCOM with true hardware-selectable dual-bank memory - enabling deterministic, glitch-free gamma curve switching essential for automotive and medical display certification.
Availability
BUF16821AIPWPR is available at Aetrix Electronics and suitable for TFT-LCD reference drivers, medical imaging display calibration, and automotive infotainment systems requiring stable component supply, long-term calibration traceability, and industrial temperature operation.
Supply support for BUF16821AIPWPR 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 leader specializing in analog, embedded processing, and high-reliability silicon solutions for industrial, automotive, and consumer markets.
The BUF16821AIPWPR belongs to TI's display interface and reference driver product line, engineered specifically for high-accuracy, programmable gamma and VCOM calibration in TFT-LCD modules - emphasizing factory programmability, long-term stability, and system-level calibration integrity.
FAQ
What is the maximum analog supply voltage supported by the BUF16821AIPWPR?
The BUF16821AIPWPR supports an absolute maximum analog supply voltage (VS) of +22 V, with recommended operating range from 9 V to 20 V. Operation at 20 V enables full rail-to-rail output swing for high-brightness LCD panels. Exceeding 22 V risks permanent damage per the Absolute Maximum Ratings table in the SBOS428C datasheet.
How does the BKSEL pin affect memory bank selection in the BUF16821AIPWPR?
In the BUF16821AIPWPR, the BKSEL pin directly selects the active nonvolatile memory bank: logic LOW selects BANK0, and logic HIGH selects BANK1. When BKSEL changes state, the device acquires the last programmed gamma/VCOM values from the newly selected bank within 36 μs. This enables hardware-triggered gamma curve switching without I²C communication.
Does the BUF16821AIPWPR support high-speed I²C mode, and what is required to enable it?
Yes, the BUF16821AIPWPR supports I²C high-speed mode up to 3.4 MHz. To enable it, the master must send a special Hs master code (00001xxx) after the START condition and before the device address - with SCL frequency ≤400 kHz during this handshake. The device switches to high-speed filters automatically and remains in Hs mode until the next STOP condition.
What is the output accuracy specification for the BUF16821AIPWPR gamma channels?
The BUF16821AIPWPR gamma channels (OUT1–OUT16) specify ±20 mV output accuracy over the full –40°C to +85°C temperature range, referenced to the reset value (code 512). This accuracy includes INL/DNL contributions and ensures consistent grayscale step fidelity across environmental conditions and panel aging.
Can the BUF16821AIPWPR be used with a 3.3 V digital supply, and what are the I/O voltage thresholds?
Yes, the BUF16821AIPWPR fully supports 3.3 V digital supply (VSD). Logic high input voltage (VIH) is guaranteed ≥0.7 × VSD (≥2.31 V), and logic low input voltage (VIL) is ≤0.3 × VSD (≤0.99 V). SCL/SDA are open-drain with 0.4 V max VOL at 3 mA sink - compatible with standard 3.3 V I²C bus pull-up configurations.
BUF16821AIPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- TFT-LCD Panels: Gamma Buffer, VCOM Driver
- Output Type:
- Rail-to-Rail
- Number of Circuits:
- 18
- -3db Bandwidth:
- -
- Slew Rate:
- -
- Current - Supply:
- 12 mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply, Single/Dual (±):
- 9V ~ 20V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-HTSSOP
BUF16821AIPWPR FAQ
1.How can I place an order for BUF16821AIPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF16821AIPWPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BUF16821AIPWPR reliable?
The price and inventory of BUF16821AIPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF16821AIPWPR is usually 5 days.
3.What payment methods are accepted for BUF16821AIPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF16821AIPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF16821AIPWPR?
BUF16821AIPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF16821AIPWPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BUF16821AIPWPR?
For technical support, including BUF16821AIPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF16821AIPWPR requirements.
6.How does Aetrix verify that BUF16821AIPWPR is sourced from the original manufacturer or authorized distributors?
All BUF16821AIPWPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BUF16821AIPWPR meets industry standards.
7.What is the process for return or replacement of BUF16821AIPWPR?
All BUF16821AIPWPR units undergo pre-shipment inspection (PSI). If there is an issue with BUF16821AIPWPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BUF16821AIPWPR part is unused and in its original packaging.
Return procedure for BUF16821AIPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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