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Texas Instruments LM8342SD
- Part No.:
- LM8342SD
- Manufacturer:
- Texas Instruments
- Category:
- Specialized ICs
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM8342SD.pdf
- Description:
- IC TFT VCOM CALIBRATOR 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,498
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Product details
Overview
LM8342SD 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 VDD from 2.25 V to 3.6 V, and is used for factory calibration of large-format TFT-LCD panels.
For engineers reviewing the LM8342SD datasheet, LM8342SD pinout, LM8342SD application, or LM8342SD equivalent, this page provides verified functional identity, confirmed pin roles, real-world VCOM tuning use cases, validated alternatives, and supply-chain support details specific to the LM8342SD variant in SON-10 package.
Technical Context
The LM8342SD implements a 7-bit DAC controlling a precision current sink whose full-scale value is set by external RSET and AVDD via IOUT_MAX = (AVDD / 20) × (1 / RSET). Its output current IOUT = IOUT_MAX × (DAC_code + 1) / 128 enables fine-grained VCOM voltage adjustment across resistive dividers.
It features dual memory architecture: a volatile register for runtime DAC control and embedded 7-bit EEPROM for persistent storage. Write protection is managed through WPN/WPP pins, and SCL-S supports in-circuit test clock injection. The device powers on with EEPROM contents auto-loaded into the DAC register.
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 - sets VCOM tuning range via external resistor divider |
| I²C bus speed | Up to 400 kHz - supports fast factory calibration cycles without timing bottlenecks |
| Non-volatile memory | 7-bit EEPROM - retains VCOM calibration setting across power cycles and panel rework |
| Analog reference (AVDD) | 4.5 V to 18 V - enables direct use with common TFT panel AVDD rails |
| Digital supply (VDD) | 2.25 V to 3.6 V - compatible with standard 2.5 V/3.3 V logic domains |
| Package | SON-10 (3 mm × 3 mm, DAP exposed pad) - compact footprint for space-constrained display driver PCBs |
Pinout & Package
LM8342SD is housed in a 10-pin SON package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (DAP) recommended to be connected to GND for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Current sink output | Drives adjustable current into external R1/R2 divider to tune VCOM voltage level |
| AVDD (Pin 2) | Analog reference input | Sets full-scale output current magnitude; must be stable, low-noise DC rail (4.5–18 V) |
| 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/digital circuits and thermal pad connection point |
| VDD (Pin 6) | Digital supply input | Powers internal logic and I²C interface (2.25–3.6 V); decoupling required near pin |
| SDA (Pin 7) | I²C data line | Bidirectional serial data; requires external 15 kΩ pull-up to VDD per TI recommendation |
| SCL (Pin 8) | I²C clock input | Master-generated clock; 400 kHz max; 15 kΩ pull-up to VDD required |
| SCL-S (Pin 9) | Switched SCL input | Test-access clock path enabled only when WPN = high; bypasses normal SCL pin |
| SET (Pin 10) | Full-scale current programming | Connects to RSET to define IOUT_MAX; sets calibration resolution and tuning range |
Key Features
| Feature | Design Value |
|---|---|
| System-programmable EEPROM | 7-bit non-volatile storage retains VCOM calibration across power loss and panel rework without external programmer |
| Monotonic 7-bit DAC | Guaranteed monotonicity ensures predictable, stepwise VCOM voltage shifts during factory tuning |
| No external programming voltage | EEPROM writes use internal charge pump - eliminates need for 12 V or VPP supply on production line |
| Factory-calibration optimized interface | I²C protocol with P-bit control allows selective register vs. EEPROM writes - critical for high-throughput panel calibration |
| Thermal-stable current sink | Output current drift < ±1 LSB over −40°C to +85°C - maintains VCOM accuracy across environmental stress testing |
Applications
| TFT Panel Factory Calibration | Digital Potentiometer Replacement |
|---|---|
|
Use Scenario: Automated VCOM tuning station for 24-inch+ TFT-LCD modules during final assembly, where operator views screen frontally while adjusting via host controller. IC Role / Device Role / Timing Role: Programmable current sink that injects calibrated current into R1/R2 divider to shift VCOM voltage precisely around AVDD/2. Use Value: Eliminates manual potentiometer trimming; reduces calibration time by >60% and improves inter-panel VCOM uniformity to ±5 mV. |
Use Scenario: Replacing mechanical trimmers in legacy display driver designs where board space and long-term drift are concerns. IC Role / Device Role / Timing Role: Digitally controlled current source replacing analog voltage-setting potentiometers in bias networks. Use Value: Enables remote recalibration via firmware; removes field service need for physical access to trimmer; supports design reuse across AVDD variants (4.5–18 V). |
| Programmable Current Sink | VCOM Driver Bias Tuning |
|
Use Scenario: Precision bias current generation for gamma correction buffers or op-amp offset nulling in display timing controllers. IC Role / Device Role / Timing Role: Adjustable current source referenced to AVDD, delivering stable 5–100 µA with <10 µs settling time. Use Value: Provides 128-step resolution without external DAC or op-amp circuitry - reduces BOM count and layout area by 3 components per channel. |
Use Scenario: Fine-tuning VCOM voltage in high-resolution industrial displays where pixel inversion artifacts require sub-10 mV VCOM stability. IC Role / Device Role / Timing Role: Sets VCOM tap point via current-controlled voltage divider; output directly interfaces with dedicated VCOM buffer (e.g., LM8207). Use Value: Achieves <±0.5 LSB total unadjusted error over temperature - enables consistent grayscale reproduction across operating life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable current sink applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM8341SD | Same SON-10 package and pinout; lacks EEPROM - volatile-only register; no persistent calibration storage | Requires external MCU to reload DAC setting at every power-on; unsuitable for standalone factory calibration | Select LM8341SD only if calibration is performed dynamically under MCU control and EEPROM persistence is unnecessary |
| AD5623RBRMZ-5 | 2.7–5.5 V VDD; 12-bit DAC; no integrated current sink - requires external transistor/buffer for current output | Higher resolution but adds complexity: needs external op-amp, MOSFET, and feedback network to replicate LM8342SD's current sink function | Choose AD5623RBRMZ-5 only when 12-bit granularity is mandatory and board area/layout effort for discrete current stage is acceptable |
Compared with LM8342SD, LM8341SD omits non-volatile storage-requiring continuous host supervision-while AD5623RBRMZ-5 delivers higher DAC resolution but demands external circuitry to achieve equivalent current-sink functionality, increasing bill-of-materials and validation scope.
Availability
LM8342SD is available at Aetrix Electronics and suitable for TFT-LCD factory calibration, display driver bias tuning, and programmable current sink applications requiring stable component supply, guaranteed traceability, and long-term lifecycle support.
Supply support for LM8342SD 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, embedded processing, and high-reliability silicon solutions for industrial, automotive, and consumer markets.
The LM8342SD belongs to TI's display interface and calibration IC product line, designed specifically to replace manual potentiometers in TFT-LCD VCOM adjustment with digitally programmable, factory-deployable precision current sources.
FAQ
What is the primary function of the LM8342SD in TFT-LCD systems?
The LM8342SD serves as a programmable VCOM calibrator by generating a precise, digitally adjustable current (5–100 µA in 128 steps) that tunes the VCOM voltage via an external resistor divider. Its integrated 7-bit EEPROM stores the calibrated DAC setting, enabling repeatable, power-cycle-resilient VCOM alignment without manual potentiometer adjustment - a key enabler for automated TFT panel manufacturing.
How does the LM8342SD handle power-on initialization?
At power-on, the LM8342SD automatically copies the stored 7-bit DAC value from its embedded EEPROM into the volatile register, immediately establishing the pre-calibrated VCOM output current. This ensures consistent behavior across cold starts, resets, and brownout recovery - eliminating the need for host MCU reinitialization before display operation begins.
Can the LM8342SD operate with different AVDD and VDD voltage combinations?
Yes - the LM8342SD supports AVDD from 4.5 V to 18 V and VDD from 2.25 V to 3.6 V, with defined constraints: when AVDD is 4.5–13 V, VDD may be 2.25–3.6 V; when AVDD is 13–18 V, VDD must be 2.6–3.6 V. This flexibility allows direct integration into diverse TFT power architectures while maintaining specified output current accuracy and EEPROM write reliability.
What is the role of the SET pin on the LM8342SD?
The SET pin on the LM8342SD connects to an external resistor (RSET) that defines the maximum output current (IOUT_MAX) according to IOUT_MAX = (AVDD / 20) × (1 / RSET). Selecting RSET determines both the absolute current range and the step size (e.g., 10 kΩ yields ~5–100 µA), directly impacting VCOM tuning resolution and total adjustment window in the target panel design.
Is the LM8342SD pin-compatible with other members of the LM834x family?
The LM8342SD shares identical pinout, package (SON-10), and core interface with LM8341SD, differing only in EEPROM presence. However, it is not pin-compatible with LM8340 or LM8343 due to distinct pin assignments (e.g., missing WPN/WPP or added enable pins). Always verify pin functions against the specific device's datasheet - LM8342SD's SCL-S, WPN, and WPP pins are essential for its factory-test and write-protection features.
LM8342SD 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:
- -
LM8342SD FAQ
1.How can I place an order for LM8342SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8342SD 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 LM8342SD reliable?
The price and inventory of LM8342SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8342SD is usually 5 days.
3.What payment methods are accepted for LM8342SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM8342SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM8342SD?
LM8342SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8342SD 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 LM8342SD?
For technical support, including LM8342SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8342SD requirements.
6.How does Aetrix verify that LM8342SD is sourced from the original manufacturer or authorized distributors?
All LM8342SD 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 LM8342SD meets industry standards.
7.What is the process for return or replacement of LM8342SD?
All LM8342SD units undergo pre-shipment inspection (PSI). If there is an issue with LM8342SD, 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 LM8342SD part is unused and in its original packaging.
Return procedure for LM8342SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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