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Texas Instruments BUF08821BIPWPR
- Part No.:
- BUF08821BIPWPR
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BUF08821BIPWPR.pdf
- Description:
- IC AMP TFT-LCD 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,439
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Product details
Overview
BUF08821BIPWPR from Texas Instruments is a programmable gamma-voltage generator and VCOM calibrator IC for TFT-LCD timing control, featuring eight 10-bit gamma channels (OUT1–OUT8), one 10-bit VCOM channel, dual independent nonvolatile memory banks (16× rewrite per bank), rail-to-rail analog output swing (≤300mV from rails at 10mA), and I²C interface supporting up to 3.4MHz high-speed mode. It operates from 9V–20V analog supply and 2.0V–5.5V digital supply.
For engineers reviewing the BUF08821BIPWPR datasheet, BUF08821BIPWPR pinout, BUF08821BIPWPR application, or BUF08821BIPWPR equivalent, this device is selected for precision LCD reference driver design requiring dynamic gamma curve switching, factory calibration storage, and high-voltage rail-to-rail DAC output stability in industrial and automotive display systems.
Technical Context
The BUF08821BIPWPR implements a double-buffered DAC architecture with two independent 16-word nonvolatile memory banks (BANK0/BANK1), enabling sub-10μs gamma curve switching via the BKSEL pin. Each gamma/VCOM channel uses a segmented resistor ladder with 10-bit resolution and on-chip parity error correction for OTP memory reliability.
It integrates ESD-protected open-drain I²C interface (SCL/SDA), address-selectable A0 pin, and dedicated VCOM output capable of sourcing/sinking ≥100mA. Analog outputs are internally referenced to VS (9V–20V), while digital logic operates from VSD (2.0V–5.5V), with strict power-up sequencing required (VSD before VS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit DAC for all 8 gamma + 1 VCOM channels; enables 1024-step voltage granularity across full analog supply range. |
| Analog Supply Range | 9V to 20V (VS); supports direct connection to LCD panel HV bias rails without external regulators. |
| Digital Supply Range | 2.0V to 5.5V (VSD); compatible with 3.3V or 5V microcontroller I²C buses. |
| I²C Speed Support | Up to 3.4MHz high-speed mode; reduces gamma programming time vs. standard 400kHz mode. |
| OTP Memory Banks | Two independent 16-word banks; allows simultaneous storage and instant switching between two distinct gamma curves. |
| Rail-to-Rail Output Swing | ≤300mV from VS or GND at 10mA load (gamma); ≤2V from VS/GND at 100mA (VCOM); ensures full-panel grayscale fidelity. |
| Max Output Current | ≥300mA total drive capability (VCOM + gamma combined); sustains driving multiple source driver reference inputs. |
| Operating Temperature | –40°C to +85°C ambient; qualified for industrial-grade TFT-LCD module integration. |
Pinout & Package
BUF08821BIPWPR is housed in a thermally enhanced HTSSOP-20 PowerPAD™ package (PWP), with exposed thermal pad soldered to PCB ground plane for junction temperature control (θJA = 40°C/W). Pin 20 is NC (no internal connection); GNDA and GNDD must be connected together at the device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCOM (Pin 1) | VCOM calibration output | 10-bit programmable reference output; sources/sinks ≥100mA for LCD common electrode biasing. |
| OUT1–OUT8 (Pins 2–5, 14, 17–19) | Gamma reference outputs | Eight independent 10-bit DAC outputs; each drives one gamma string in TFT-LCD column driver chain. |
| VS (Pins 6, 15) | Analog supply input | High-voltage analog rail (9V–20V); powers all gamma/VCOM DACs and output buffers. |
| GNDA/GNDD (Pins 7, 13, 16) | Analog/digital ground | Must be shorted externally; separates analog/digital return paths while maintaining single-point grounding. |
| VSD (Pin 8) | Digital supply input | Logic supply (2.0V–5.5V); powers I²C interface, memory, and control logic - must power up before VS. |
| SCL/SDA (Pins 9–10) | I²C serial interface | Open-drain bus lines; require external pull-ups; support 3.4MHz high-speed mode for fast calibration writes. |
| A0 (Pin 11) | I²C address select | Configures slave address as 0x74 (A0=LOW) or 0x75 (A0=HIGH); enables dual-device bus configuration. |
| BKSEL (Pin 12) | Memory bank selector | Active-HIGH selects BANK1; active-LOW selects BANK0; enables <10μs gamma curve switching without I²C traffic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent OTP memory banks | Enables field-updatable gamma tuning and instant A/B curve switching for adaptive display modes (e.g., daylight/night). |
| Rail-to-rail output with 300mV headroom | Maintains full 10-bit linearity across entire VS range (9V–20V), critical for accurate grayscale reproduction in wide-VS panels. |
| On-chip parity error correction | Corrects single-bit failures in OTP memory, ensuring gamma/VCOM values remain valid after 16 write cycles or extended storage. |
| High-speed I²C (3.4MHz) | Reduces factory calibration time by >8× vs. standard 400kHz mode; accelerates panel-specific gamma programming. |
| 100mA VCOM drive capability | Directly drives high-capacitance LCD common electrode without external buffer, simplifying BOM and layout. |
| Power sequencing enforcement | Internal logic prevents operation if VSD is not applied before VS, eliminating latch-up risk during system power-up. |
Applications
| Industrial TFT-LCD Panels | Automotive Instrument Clusters |
|---|---|
|
Use Scenario: High-reliability 7–12 inch LCD modules used in factory HMIs, medical displays, and ruggedized terminals operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Primary gamma reference generator and VCOM calibrator; provides stable, programmable analog references synchronized to timing controller's frame rate. Use Value: Eliminates external trim pots and manual calibration; enables one-time factory programming of gamma/VCOM with 10-bit precision and 100-year memory retention. |
Use Scenario: Digital instrument clusters with dynamic theme switching (e.g., day/night mode) requiring real-time gamma adjustment without display flicker. IC Role / Device Role / Timing Role: Dual-bank gamma manager; BKSEL pin toggles between pre-stored gamma curves in <10μs, synchronized to display controller's mode signal. Use Value: Enables seamless visual transitions between lighting conditions without software intervention or frame buffer reload delays. |
| Medical Imaging Displays | Avionics Multi-Function Displays |
|
Use Scenario: Diagnostic monitors requiring DICOM-compliant grayscale linearity and long-term calibration stability over 10+ years. IC Role / Device Role / Timing Role: Precision reference source for gamma correction circuitry; maintains traceable 10-bit accuracy across temperature and lifetime. Use Value: On-chip OTP memory with parity correction ensures gamma data integrity even after 16 rewrites or 100-year storage - meeting IEC 62304 safety requirements. |
Use Scenario: MIL-STD-810G certified cockpit displays operating in extreme thermal environments and subject to ESD events. IC Role / Device Role / Timing Role: High-voltage reference driver with 4kV HBM ESD rating; supplies stable gamma/VCOM under rapid thermal cycling and vibration. Use Value: HTSSOP-20 PowerPAD™ package delivers low θJA (40°C/W) and robust mechanical mounting - critical for avionics conduction-cooled assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gamma reference driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF16821IPWPR | 16-channel gamma (no VCOM); same 10-bit resolution, HTSSOP-24 package; no dual-bank memory or BKSEL pin. | Lacks integrated VCOM driver and dynamic curve switching; requires external VCOM IC and MCU-managed gamma updates. | Select when only gamma scaling is needed and VCOM is handled separately; not suitable for space-constrained or low-latency switching designs. |
| BUF20820IRHBR | 20-channel gamma + VCOM; QFN-32 package; includes EEPROM-based memory but no BKSEL hardware switch. | Supports larger panels but relies on I²C commands (not pin-level) for bank selection - adds 280μs latency vs. BUF08821BIPWPR's <10μs switch. | Choose for higher channel count and smaller footprint; avoid when sub-10μs gamma switching is mandatory for display responsiveness. |
Compared with BUF16821IPWPR and BUF20820IRHBR, the BUF08821BIPWPR uniquely combines 8+1 channel count, dual-bank hardware-switched memory, and integrated 100mA VCOM drive in a thermally optimized 20-pin package - making it optimal for cost-sensitive, latency-critical industrial and automotive LCD modules.
Availability
BUF08821BIPWPR is available at Aetrix Electronics and suitable for TFT-LCD reference drivers, automotive instrument clusters, industrial HMIs, and medical imaging displays requiring stable component supply, long-term calibration retention, and high-voltage analog precision.
Supply support for BUF08821BIPWPR 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 communications markets.
The BUF08821BIPWPR belongs to TI's LCD timing and reference driver product line, engineered specifically for high-voltage, high-precision gamma/VCOM generation in TFT-LCD panels - emphasizing factory programmability, memory reliability, and thermal robustness.
FAQ
What is the maximum analog supply voltage for BUF08821BIPWPR?
The BUF08821BIPWPR supports an absolute maximum analog supply voltage (VS) of +22V, with recommended operating range from 9V to 20V. Exceeding 22V may cause permanent damage. Operation at 20V enables full rail-to-rail output swing for wide-VS LCD panels, and the device's high-voltage CMOS process ensures stable performance across this range. Always observe the specified derating above 18V per TI's thermal guidelines.
How does the BKSEL pin function in BUF08821BIPWPR?
The BKSEL pin on the BUF08821BIPWPR selects between two independent nonvolatile memory banks: LOW selects BANK0, HIGH selects BANK1. When BKSEL changes state, the device switches all gamma and VCOM outputs to the corresponding stored values in <10μs - enabling instantaneous gamma curve transitions without I²C communication. This hardware-based switching is critical for real-time display adaptation in automotive and medical applications where software latency is unacceptable.
Does BUF08821BIPWPR support I²C high-speed mode, and how is it enabled?
Yes, the BUF08821BIPWPR fully supports I²C high-speed mode up to 3.4MHz. To enable it, the master must send a special Hs master code (00001xxx, with SCL ≤400kHz) immediately after the START condition - before any device address. The BUF08821BIPWPR responds by activating its high-speed filters and accepting subsequent data at up to 3.4MHz. No register configuration is required; the device automatically exits Hs mode upon receiving a STOP condition.
What is the OTP memory endurance and retention specification for BUF08821BIPWPR?
The BUF08821BIPWPR provides 16 guaranteed write cycles per word in each of its two nonvolatile memory banks, with 100-year data retention at +85°C. Each bank stores 16 words (8 gamma + 1 VCOM), and on-chip parity error correction ensures single-bit failures are corrected during memory acquire operations. This endurance supports factory calibration, panel rework, and field updates while meeting long-life requirements for industrial and medical displays.
Can BUF08821BIPWPR drive both gamma strings and VCOM simultaneously?
Yes, the BUF08821BIPWPR is designed to drive all nine outputs concurrently: eight gamma channels (OUT1–OUT8) and one VCOM channel (Pin 1). Its analog output stage supports ≥300mA total current capability, with VCOM rated for ≥100mA sink/source and each gamma channel delivering ≥10mA. This integrated drive eliminates need for external buffers in most TFT-LCD designs, reducing component count and board area while maintaining rail-to-rail accuracy across all outputs.
BUF08821BIPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-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:
- 8
- -3db Bandwidth:
- -
- Slew Rate:
- -
- Current - Supply:
- 4.6 mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply, Single/Dual (±):
- 9V ~ 20V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-HTSSOP
BUF08821BIPWPR FAQ
1.How can I place an order for BUF08821BIPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF08821BIPWPR 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 BUF08821BIPWPR reliable?
The price and inventory of BUF08821BIPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF08821BIPWPR is usually 5 days.
3.What payment methods are accepted for BUF08821BIPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF08821BIPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF08821BIPWPR?
BUF08821BIPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF08821BIPWPR 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 BUF08821BIPWPR?
For technical support, including BUF08821BIPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF08821BIPWPR requirements.
6.How does Aetrix verify that BUF08821BIPWPR is sourced from the original manufacturer or authorized distributors?
All BUF08821BIPWPR 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 BUF08821BIPWPR meets industry standards.
7.What is the process for return or replacement of BUF08821BIPWPR?
All BUF08821BIPWPR units undergo pre-shipment inspection (PSI). If there is an issue with BUF08821BIPWPR, 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 BUF08821BIPWPR part is unused and in its original packaging.
Return procedure for BUF08821BIPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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