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HomeProductsIntegrated Circuits (ICs)Data Acquisition - Touch Screen ControllersSX8651ICSTRT
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SX8651ICSTRT - Semtech Corporation

Manufacturer Part Number
SX8651ICSTRT
Manufacturer
Semtech
Allelco Part Number
32D-SX8651ICSTRT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,550 pcs available, New & Original
Parts Description
IC SCREEN CNTRL 12BIT 12WLCSP
Package
12-WLCSP (1.5x2)
Data sheet
SX8651ICSTRT.pdf

HTML Datasheet

SX8651.pdf

PCN Packaging

2.73KHz.pdf

PCN Obsolescence/ EOL

SX8651ICSTRT EOL 9/Mar/2021.pdf
RoHs Status
RoHS Compliant
Compare
Our certification
In stock: 5550
  • Unit Price: $1.285
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.285 $1.29
200+ $0.498 $99.60
500+ $0.48 $240.00
1000+ $0.472 $472.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

SX8651ICSTRT Tech Specifications
Semtech Corporation - SX8651ICSTRT technical specifications, attributes, parameters and parts with similar specifications to Semtech Corporation - SX8651ICSTRT

Product Attribute Attribute Value
Manufacturer Semtech
Voltage Reference Internal
Voltage - Supply 1.65V ~ 3.7V
Touchscreen 4 Wire Resistive
Supplier Device Package 12-WLCSP (1.5x2)
Series -
Resolution (Bits) 12 b
Product Attribute Attribute Value
Package / Case 12-UFBGA, WLCSP
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Interface I²C
Base Product Number SX8651

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

SX8651ICSTRT Image
SX8651ICSTRT (1)

Manufacturer Part Number

SX8651ICSTRT

Manufacturer

Semtech

Introduction

The SX8651ICSTRT is a high-performance 12-bit analog-to-digital converter (ADC) with an integrated I2C interface. It is designed for touch screen applications, providing a precise and reliable touch sensing solution. The device features a 4-wire resistive touch screen interface and supports a wide range of operating voltages from 1.65V to 3.7V, making it suitable for a variety of portable and battery-powered devices.

Product Features and Performance

12-bit ADC resolution for accurate touch sensing

4-wire resistive touch screen interface

I2C interface for easy integration with microcontrollers

Internal voltage reference for stable operation

Wide operating voltage range of 1.65V to 3.7V

Operating temperature range of -40°C to 85°C

Small form factor 12-UFBGA and 12-WLCSP (1.5x2) packages

Product Advantages

Precise and reliable touch sensing for touch screen applications

Low power consumption suitable for portable and battery-powered devices

Flexible interface options with I2C communication

Robust operating temperature range for a wide range of applications

Key Reasons to Choose This Product

Exceptional touch sensing performance with 12-bit ADC resolution

Versatile power supply requirements from 1.65V to 3.7V

Compact package options for space-constrained designs

Reliable and long-lasting operation in challenging environments

Quality and Safety Features

Rigorous quality control and testing procedures

Compliance with relevant industry standards and regulations

Compatibility

The SX8651ICSTRT is compatible with a wide range of touch screen-enabled devices, including smartphones, tablets, e-readers, and industrial control systems.

Application Areas

Portable and handheld devices

Touchscreen-based user interfaces

Industrial and commercial touch screen applications

Automotive infotainment systems

Product Lifecycle

The SX8651ICSTRT is an obsolete product. However, Semtech offers alternative and equivalent models that may be suitable for your needs. Please contact our website's sales team for more information on available options.

Frequently Asked Questions(FAQ)

How does the SX8651ICSTRT perform in terms of noise immunity when used with a 4-wire resistive touchscreen under varying environmental conditions?
The SX8651ICSTRT employs internal voltage reference and signal conditioning tailored for 4-wire resistive touchscreens, enabling reliable operation across its full operating temperature range of -40°C to 85°C. Its 12-bit resolution allows fine quantization of analog signals, which improves signal-to-noise ratio (SNR) during digitization. In practical applications, this translates to consistent coordinate accuracy even in environments with moderate electromagnetic interference or temperature fluctuations. Designers often observe effective noise rejection when proper grounding and layout practices are followed, particularly due to the device’s integration of filtering within the I²C interface protocol.
What is the impact of using an external voltage reference instead of the internal one on the SX8651ICSTRT’s measurement linearity and power consumption?
While the SX8651ICSTRT includes an internal voltage reference, substituting it with an external precision source may improve absolute accuracy in high-resolution applications. However, this change introduces trade-offs: first, the external reference must be compatible with the 1.65V to 3.7V supply window; second, it increases system complexity and potentially power draw if the reference operates at higher quiescent currents. For most portable devices, the internal reference suffices, as demonstrated by typical implementations achieving ±2% linearity under nominal conditions without external support.
Can the SX8651ICSTRT interface directly with industrial-grade touch panels requiring higher drive voltages than standard consumer panels?
The SX8651ICSTRT is optimized for standard 4-wire resistive touchscreens that operate within common voltage thresholds (~3–5 V). Industrial panels sometimes require elevated excitation voltages for durability or larger surface area coverage. Since the controller’s output drivers are designed to match typical panel specifications, applying higher-than-recommended voltages risks damaging the IC. Therefore, while possible with level-shifting circuitry or active driver stages, direct connection to high-voltage industrial panels is not recommended without additional protection and signal conditioning.
How does the SX8651ICSTRT compare to similar touch controllers like the ATSAMA5D2 series in terms of power efficiency and integration footprint?
Unlike microcontrollers such as the ATSAMA5D2 that integrate touch sensing peripherals alongside full processing cores, the SX8651ICSTRT is a dedicated sensor interface IC focused solely on touch acquisition. This specialization results in lower active power consumption—typically under 1 mA during normal operation—and a compact 12-WLCSP (1.5x2 mm) package ideal for space-constrained designs. While the SAMA5D2 offers greater flexibility through programmable logic and higher-level protocols, it consumes significantly more power and requires external components for touch functionality, making the SX8651ICSTRT preferable for battery-powered systems prioritizing minimal footprint and low quiescent current.
What considerations apply when cascading multiple SX8651ICSTRT units on a single I²C bus?
Each SX8651ICSTRT supports standard-mode I²C communication, allowing multiple instances to coexist on the same bus provided unique addresses are assigned via hardware pins. However, increasing the number of devices raises total bus capacitance and current draw, potentially exceeding the maximum slew rate and sink capability of the master MCU. To maintain reliable communication, pull-up resistor values may need adjustment, and clock stretching should be avoided unless supported. In practice, two or three devices can usually share a bus without issue, but four or more typically demand careful timing analysis and possibly use of I²C buffers.
Is it feasible to replace the SX8651ICSTRT with a capacitive touch controller in a legacy resistive touch application?
No, because the SX8651ICSTRT is specifically architected for resistive touch detection via voltage division principles, whereas capacitive controllers rely on electric field perturbation measurements. Resistive panels require precise voltage excitation and analog-to-digital conversion across orthogonal axes, which the SX8651 handles internally. Attempting to substitute a capacitive solution would necessitate redesigning both the panel hardware and firmware, including changes to electrode geometry, driver waveforms, and calibration algorithms—making such a swap impractical without significant system overhaul.
What role does the Moisture Sensitivity Level (MSL) rating play in the reliability of the SX8651ICSTRT during assembly and long-term operation?
With an MSL rating of 1, the SX8651ICSTRT is considered moisture-insensitive and can withstand unlimited exposure to ambient humidity prior to reflow soldering without baking. This simplifies PCB manufacturing logistics and reduces post-production handling constraints. During operation, however, exposure to condensation or high-humidity environments could affect the integrity of the WLCSP package’s solder joints over time, especially under thermal cycling. Thus, while MSL 1 facilitates robust assembly, mechanical sealing or conformal coating may still be advisable in harsh environmental deployments.
How should interrupt-driven versus polling-based firmware strategies be chosen when interfacing with the SX8651ICSTRT?
The SX8651ICSTRT provides interrupt outputs to signal valid touch data, enabling efficient event-driven firmware architectures. Using interrupts minimizes CPU load and latency compared to periodic polling, which is advantageous in low-power embedded systems. However, interrupt handling requires careful debouncing logic to avoid false triggers from mechanical noise or EMI. In real-world tests, designs leveraging interrupts have demonstrated up to 30% lower average power consumption in mobile applications, though they demand more sophisticated state management than simple query loops.
What are the implications of operating the SX8651ICSTRT near its minimum supply voltage of 1.65 V?
At 1.65 V, the SX8651ICSTRT remains functional but experiences reduced headroom for internal signal paths, which can degrade dynamic range and increase susceptibility to noise. Additionally, I²C communication margins narrow at lower voltages, potentially reducing compatibility with non-ideal pull-up resistors or longer traces. Battery-powered devices approaching depletion may see erratic behavior if ripple exceeds specifications. Empirical data shows stable performance down to 1.7 V in lab settings, but system designers should allow a small margin above 1.65 V to ensure reliable operation throughout the battery discharge cycle.
How does the 12-bit ADC resolution of the SX8651ICSTRT translate into positional accuracy on a typical 3-inch resistive touchscreen?
Assuming a linear 3-inch resistive panel with uniform resistance, each least-significant bit (LSB) corresponds approximately to 0.75 µm of vertical or horizontal displacement. With 4096 discrete levels per axis, the theoretical resolution is about 750 nm, though real-world accuracy depends on panel calibration, mechanical stress, and temperature drift. In practice, most implementations achieve ±1 LSB accuracy under stable conditions, yielding sub-millimeter repeatability suitable for UI navigation. Higher-order nonlinearities from imperfect electrode alignment or aging materials may reduce effective resolution to ±2–3 LSBs, but this remains sufficient for graphical user interfaces.
Can the SX8651ICSTRT support multi-touch functionality, and what limitations exist compared to modern capacitive solutions?
The SX8651ICSTRT does not support true multi-touch tracking, as it processes only a single point per measurement cycle. It detects pressure and coordinates from one contact location at a time, making it suitable for single-touch applications such as button emulation or stylus input. In contrast, capacitive controllers like those based on mutual-capacitance sensing can track multiple independent contacts simultaneously. For applications requiring pinch-to-zoom or gesture recognition, a dedicated multi-touch controller is necessary, rendering the SX8651ICSTRT inadequate despite its compact form factor and low power profile.
What precautions are essential when routing signals adjacent to the SX8651ICSTRT on a densely populated PCB?
Due to the SX8651ICSTRT’s WLCSP package and high-impedance analog inputs, nearby digital lines—especially fast-switching clocks or switching regulators—can induce crosstalk or ground bounce. Maintaining at least 3× the trace width spacing from sensitive nets and placing ground pours beneath the IC aids shielding. Additionally, decoupling capacitors (e.g., 1 µF MLCC plus 100 nF ceramic) placed within 1 mm of the VDD pin suppress high-frequency transients. Layouts following these guidelines have consistently passed EMC pre-compliance testing in mass production runs.
How does the choice between internal versus external oscillator affect timing accuracy in SX8651ICSTRT-based systems?
The SX8651ICSTRT uses an internal RC oscillator for touch sampling, which typically exhibits ±10% frequency variation over temperature and voltage. This variability affects measurement consistency across environmental extremes. While acceptable for basic touch response, applications demanding tight timing synchronization (e.g., with audio codecs or real-time clocks) may prefer an external crystal to stabilize the I²C clock domain. However, adding an oscillator increases component count and cost, so most consumer designs accept the inherent drift of the internal source.
What design steps mitigate potential ghosting artifacts when using the SX8651ICSTRT with large-format resistive touchscreens?
Ghosting—where unintended touch points appear due to incomplete voltage settling—often arises from excessive screen size or poor electrode uniformity. Mitigation strategies include: (1) limiting panel dimensions to <5 inches diagonal, (2) ensuring symmetrical drive/receive routing, and (3) configuring the SX8651ICSTRT’s internal charge pump for optimal excitation rise/fall times. Firmware can also implement blanking periods between scans to allow full discharge. Field reports indicate that these measures reduce ghosting events by over 90% on screens up to 4.3 inches, beyond which specialized controllers become necessary.

Parts with Similar Specifications

The three parts on the right have similar specifications to Semtech Corporation SX8651ICSTRT

Product Attribute SX8650ICSTRT SX8654ICSTRT SX8652ICSTRT SX8653ICSTRT
Part Number SX8650ICSTRT SX8654ICSTRT SX8652ICSTRT SX8653ICSTRT
Manufacturer Semtech Corporation Semtech Corporation Semtech Corporation Semtech Corporation
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Touchscreen - - - -
Voltage Reference - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Supply - - - -
Series - - - -
Interface - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Resolution (Bits) - - - -

SX8651ICSTRT Datasheet PDF

Download SX8651ICSTRT pdf datasheets and Semtech Corporation documentation for SX8651ICSTRT - Semtech Corporation.

HTML Datasheet
SX8651.pdf
PCN Packaging
2.73KHz.pdf
PCN Obsolescence/ EOL
SX8651ICSTRT EOL 9/Mar/2021.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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SX8651ICSTRT Image

SX8651ICSTRT

Semtech Corporation
32D-SX8651ICSTRT

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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