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Texas Instruments LM8342SDX
- Part No.:
- LM8342SDX
- Manufacturer:
- Texas Instruments
- Category:
- Specialized ICs
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM8342SDX.pdf
- Description:
- IC TFT VCOM CALIBRATOR 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
LM8342SDX from Texas Instruments is a programmable TFT VCOM calibrator IC integrating a 7-bit non-volatile EEPROM and a digitally controlled current sink. It delivers 5–100 µA output current in 128 linear steps, supports I²C interface up to 400 kHz, operates with AVDD from 4.5 V to 18 V, and targets factory calibration of large-format TFT-LCD panels by replacing manual potentiometer adjustment.
For engineers reviewing the LM8342SDX datasheet, LM8342SDX pinout, LM8342SDX application, or LM8342SDX equivalent, this page provides verified technical context, confirmed pin functions, real-world VCOM calibration use cases, and validated alternative options for TFT panel production and embedded display systems.
Technical Context
The LM8342SDX implements a 7-bit DAC controlling a precision current sink whose full-scale value is set externally via RSET and AVDD (IOUT_MAX = AVDD/(20 × RSET)). Its output current (IOUT) is digitally adjustable from 1/128 to 128/128 of IOUT_MAX with monotonicity ensured across temperature (−40°C to +85°C).
It features dual memory architecture: a volatile register for runtime DAC control and a 7-bit EEPROM for persistent storage of calibration settings. Write protection is managed via WPN/WPP pins, and SCL-S enables in-circuit test clock injection without disrupting main SCL routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC resolution | 7-bit (128-step) monotonic output current control |
| Output current range | 5 µA to 100 µA - fully programmable sink for VCOM bias tuning |
| I²C interface speed | Up to 400 kHz - supports fast factory calibration cycles |
| Analog reference (AVDD) | 4.5 V to 18 V - enables compatibility with diverse TFT panel power rails |
| Digital supply (VDD) | 2.25 V to 3.6 V - low-voltage logic compatible with microcontrollers and FPGAs |
| Non-volatile memory | 7-bit EEPROM - retains VCOM calibration across power cycles without external backup |
| Package | SON-10 (3 mm × 3 mm, 0.5 mm pitch) - compact footprint for space-constrained display modules |
Pinout & Package
LM8342SDX is housed in a 10-pin SON (Small Outline No-lead) package with exposed thermal pad (DAP), optimized for thermal performance in display calibration circuits. Pin 1 is OUT (current sink output); pin 5 is GND; pin 10 is SET (RSET connection for full-scale current programming).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Current sink output | Drives VCOM node via external resistor divider; output current digitally tuned in 128 steps |
| AVDD (Pin 2) | Analog reference voltage input | Sets full-scale current range (IOUT_MAX = AVDD/(20 × RSET)); must be ≥4.5 V for operation |
| WPN (Pin 3) | Write protect (active-low input) | Blocks EEPROM writes when low; enables SCL-S switching to SCL when high |
| WPP (Pin 4) | Write protect inverted output | Logic inversion of WPN; used for status indication or cascaded protection |
| GND (Pin 5) | Ground reference | Common return for analog and digital circuitry; connects to DAP for thermal conduction |
| VDD (Pin 6) | Digital supply voltage | Provides power for I²C interface and control logic (2.25–3.6 V range) |
| SDA (Pin 7) | I²C serial data line | Bidirectional data path for reading DAC register or writing EEPROM; requires external 15 kΩ pull-up |
| SCL (Pin 8) | I²C serial clock input | Master-generated clock for I²C transactions; max 400 kHz frequency supported |
| SCL-S (Pin 9) | Switched SCL input | Test-accessible clock path activated when WPN = high; isolates main SCL during board-level testing |
| SET (Pin 10) | Full-scale current setting | Connects to RSET resistor; defines IOUT_MAX scaling factor with AVDD (Equation 1) |
Key Features
| Feature | Design Value |
|---|---|
| I²C-compatible interface | Enables integration into existing display controller firmware without custom protocol stacks |
| Non-volatile EEPROM storage | Eliminates need for external NVM or calibration reprogramming at boot; 1000 write cycles guaranteed |
| Monotonic 7-bit DAC | Ensures predictable VCOM voltage shift direction during calibration sweeps - critical for visual pass/fail judgment |
| Programmable current sink | Replaces mechanical potentiometers with electronic tuning, enabling automated front-view calibration on large panels |
| Write protection (WPN/WPP) | Prevents accidental EEPROM overwrites during system operation or field updates |
Applications
| TFT Panel Factory Calibration | Digital Potentiometer Replacement |
|---|---|
Use Scenario: Automated VCOM level tuning during final assembly of 24-inch+ TFT-LCD modules using front-facing visual inspection. IC Role / Device Role / Timing Role: Programmable current sink adjusting VCOM voltage via resistive divider; replaces manual trimmer potentiometer. Use Value: Reduces calibration time per panel by >60% and eliminates operator variability in grayscale uniformity testing. |
Use Scenario: Replacing mechanical potentiometers in legacy display driver designs where space or reliability is constrained. IC Role / Device Role / Timing Role: Digitally controlled current source providing stable DC bias for gamma correction or VCOM buffer offset trimming. Use Value: Enables remote recalibration via I²C without physical access; supports firmware-based tuning profiles across product variants. |
| Programmable Current Sink | VCOM Level Driver |
Use Scenario: Biasing a programmable gamma reference generator in an integrated timing controller (TCON) ASIC. IC Role / Device Role / Timing Role: Precision current sink generating reference current proportional to DAC code; temperature-stable due to AVDD-based scaling. Use Value: Delivers <±0.2 LSB differential nonlinearity across −40°C to +85°C, ensuring consistent gamma curve accuracy. |
Use Scenario: Fine-tuning VCOM voltage in high-resolution industrial TFT displays where ±0.5 V tuning range is required. IC Role / Device Role / Timing Role: Controls VCOM tap point in R1/R2 divider network; output current directly modulates VCOM = AVDD × [1 − (IOUT × R1)/AVDD]. Use Value: Achieves <±0.1% VCOM drift over temperature using standard 1% RSET and AVDD-referenced architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable current sink applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM8341SDX | Same SON-10 package and pinout; lacks EEPROM - volatile-only register; no non-volatile storage | Requires external MCU to reload DAC setting at power-on; unsuitable for standalone calibration | Select when calibration data is managed externally and board-level EEPROM is not needed |
| AD5662BRMZ-1 | 16-bit DAC with internal 2.5 V reference; no integrated current sink - requires external op-amp and transistor | Higher resolution but adds 4+ components and layout complexity; no built-in VCOM-specific scaling | Select only when sub-LSB VCOM precision is required and design can accommodate added BOM and layout overhead |
Compared with LM8342SDX, LM8341SDX removes non-volatility at the cost of system-level calibration persistence, while AD5662BRMZ-1 trades integration for resolution - neither offers the same combination of EEPROM, current sink, and TFT-optimized scaling in a single SON-10 device.
Availability
LM8342SDX is available at Aetrix Electronics and suitable for TFT panel factory calibration, programmable current sink designs, and VCOM level driver implementations requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial display manufacturing.
Supply support for LM8342SDX 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 power management, signal chain, and display interface solutions.
The LM8342SDX belongs to TI's display calibration IC product line, designed specifically to replace mechanical potentiometers in TFT-LCD VCOM tuning - enabling automated, repeatable, and temperature-stable factory calibration.
FAQ
What is the primary function of the LM8342SDX in TFT-LCD systems?
The LM8342SDX serves as a programmable VCOM calibrator IC that replaces manual potentiometer adjustment in TFT-LCD manufacturing. It integrates a 7-bit DAC and non-volatile EEPROM to generate a digitally tunable current sink (5–100 µA), which adjusts the VCOM voltage via an external resistor divider. This enables front-view visual calibration of large panels and ensures consistent grayscale uniformity across production batches. The LM8342SDX is specifically engineered for this role - its AVDD-referenced current scaling and EEPROM retention make it distinct from generic DACs.
How does the LM8342SDX store calibration settings across power cycles?
The LM8342SDX stores calibration settings in an embedded 7-bit EEPROM that retains data without power. At power-on, the device automatically copies the EEPROM contents to its volatile DAC register, restoring the last programmed VCOM current value. Writing to EEPROM is performed via the I²C interface using a dedicated "Write to EE" command (P-bit = 0 during Write operation), and the process takes 200–300 ms. The LM8342SDX guarantees 1000 EEPROM write cycles and 10,000 read cycles, making it suitable for repeated factory calibration iterations.
What are the absolute maximum ratings for AVDD and VDD on the LM8342SDX?
The LM8342SDX has an absolute maximum AVDD rating of 20 V and a maximum VDD rating of 5 V. However, functional operating ranges are narrower: AVDD must be between 4.5 V and 18 V, and VDD must be between 2.25 V and 3.6 V (or 2.6 V to 3.6 V when AVDD exceeds 13 V). Exceeding these operating limits may cause improper DAC scaling or EEPROM corruption. The LM8342SDX also specifies a junction temperature limit of +150°C and storage range of −65°C to +150°C - all values confirmed in the official SNOSAM0B datasheet.
Can the LM8342SDX be used without an external RSET resistor?
No - the LM8342SDX requires an external RSET resistor connected to the SET pin (Pin 10) to define its full-scale output current (IOUT_MAX = AVDD/(20 × RSET)). Without RSET, the device cannot establish a calibrated current range, and output behavior is undefined. Typical RSET values range from 10 kΩ to 45 kΩ depending on desired tuning range (e.g., ±0.5 V to ±3 V ΔVCOM at AVDD = 15 V). The LM8342SDX datasheet provides exact resistor selection tables and confirms RSET is mandatory for functional operation.
What is the purpose of the SCL-S pin on the LM8342SDX?
The SCL-S (Switched SCL) pin (Pin 9) provides an isolated test clock path for in-circuit programming and validation. When WPN is high, SCL-S is internally connected to SCL, allowing test equipment to inject clock signals without interfering with the main system SCL bus. This enables boundary-scan-like verification during PCB assembly and avoids conflicts with host controllers. The LM8342SDX datasheet confirms SCL-S has lower input capacitance (3 pF vs. 5 pF on SCL) and is intended solely for manufacturing test - it is not used during normal operation.
LM8342SDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TFT VCOM Calibrator
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
- Grade:
- -
- Qualification:
- -
LM8342SDX FAQ
1.How can I place an order for LM8342SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8342SDX 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 LM8342SDX reliable?
The price and inventory of LM8342SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8342SDX is usually 5 days.
3.What payment methods are accepted for LM8342SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM8342SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM8342SDX?
LM8342SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8342SDX 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 LM8342SDX?
For technical support, including LM8342SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8342SDX requirements.
6.How does Aetrix verify that LM8342SDX is sourced from the original manufacturer or authorized distributors?
All LM8342SDX 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 LM8342SDX meets industry standards.
7.What is the process for return or replacement of LM8342SDX?
All LM8342SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM8342SDX, 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 LM8342SDX part is unused and in its original packaging.
Return procedure for LM8342SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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