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Texas Instruments ADS7846EG4
- Part No.:
- ADS7846EG4
- Manufacturer:
- Texas Instruments
- Category:
- Touch Screen Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7846EG4.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,016
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Product details
Overview
ADS7846EG4 from Texas Instruments is a 12-bit successive-approximation ADC touch screen controller with integrated 2.5V reference, direct 0V–6V battery monitoring, on-chip temperature sensing, and touch-pressure measurement capability. It operates from 2.2V to 5.25V, supports QSPI/SPI 3-wire interface, and delivers up to 125kHz throughput for resistive touch panel systems in portable electronics.
For engineers reviewing the ADS7846EG4 datasheet, ADS7846EG4 pinout, ADS7846EG4 application, or ADS7846EG4 equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (SSOP-16), real-world use cases, and two documented alternative parts with explicit functional and application-level differences.
Technical Context
The ADS7846EG4 implements a capacitive redistribution SAR architecture with internal sample-and-hold, enabling ratiometric differential measurements for X/Y position via dedicated touch-panel drivers (X+, X−, Y+, Y−). Its dual-reference operation supports both single-ended mode (using internal 2.5V reference for battery/temperature/auxiliary inputs) and differential mode (using +VCC and GND as reference for touch position) to cancel switch-on resistance error.
It integrates three analog subsystems: a 6-channel multiplexer routing PENIRQ diode (TEMP0/TEMP1), VBAT, AUX, and touch coordinates; on-chip 2.5V bandgap reference with 15ppm/°C drift and 500µA quiescent current; and CMOS digital interface with CS-controlled power-down (3µA), BUSY/DOUT synchronization, and 24-clock conversion timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over full range - ensures monotonic position reporting without coordinate jumps. |
| Throughput Rate | Up to 125kHz - enables rapid multi-point touch sampling in PDA and handheld UIs. |
| Reference Voltage | Internal 2.45–2.55V (typ 2.50V) - powers auxiliary, battery, and temperature channels without external reference component. |
| Battery Input Range | 0.5V to 6.0V - measures raw battery voltage pre-regulator using internal 4:1 resistor divider. |
| Temperature Accuracy | ±2°C (differential method), ±3°C (TEMP0) - supports battery thermal management without calibration hardware. |
| Supply Voltage Range | 2.2V to 5.25V - compatible with Li-ion, NiMH, and 3.3V/5V system rails across portable devices. |
| Power Consumption | 280–650µA (ref off), 3µA in power-down - extends battery life in always-on touch detection modes. |
Pinout & Package
ADS7846EG4 is packaged in SSOP-16 (package code DBQ), with lead finish RoHS-compliant and moisture sensitivity level MSL-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 14) | Power supply input | Dual power domain: Pin 1 supplies analog core; Pin 14 supplies digital I/O - decoupling required per domain. |
| X+, Y+, X−, Y− (Pins 2, 3, 4, 5) | Touch panel interface terminals | Low-RON (5–6Ω) CMOS switches drive and sense resistive touch layers - enable ratiometric position measurement. |
| GND (Pin 6) | Analog ground reference | Common return for analog signals; must be isolated from digital ground to minimize noise coupling into ADC. |
| VBAT (Pin 7) | Battery monitor input | Accepts 0.5–6.0V via internal 4:1 divider - allows direct connection to battery node without external scaling. |
| AUX (Pin 8) | Auxiliary analog input | Single-ended channel for external sensors (e.g., light, humidity) referenced to internal 2.5V when enabled. |
| VREF (Pin 9) | Reference I/O pin | Output of internal 2.5V reference or input for external reference - high-impedance when internal ref is disabled. |
| PENIRQ (Pin 11) | Open-drain pen interrupt | Active-low signal asserted when touch closes panel - requires 10–100kΩ external pull-up for microcontroller wake-up. |
| DOUT (Pin 12) | Serial data output | High-impedance when CS is high - enables bus sharing with other SPI peripherals without contention. |
| BUSY (Pin 13) | Conversion status indicator | Active-high during acquisition/conversion - eliminates need for software polling or fixed delay timing. |
| DIN (Pin 14) | Serial data input | Latches control byte on rising DCLK edge - configures channel, resolution, SER/DFR, and power-down state. |
| CS (Pin 15) | Chip select | Active-low enable: high = auto power-down (ADC only); low = active conversion and serial interface. |
| DCLK (Pin 16) | External clock input | Drives SAR conversion and serial I/O timing - max 2MHz clock rate supports 125kHz sampling. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade path | 100% pin- and software-compatible with ADS7843 - enables drop-in replacement without PCB revision. |
| Ratiometric touch measurement | Differential reference mode (SER/DFR = 0) uses Y+/Y− or X+/X− as reference - eliminates error from switch RON and touch panel resistance drift. |
| Integrated battery monitor | On-chip 4:1 resistor divider accepts 0–6V input - removes need for external voltage scaling and protection circuitry. |
| Two-mode temperature sensing | Supports calibrated single-point (0.3°C/LSB) or uncalibrated differential (±2°C) measurement - reduces BOM and factory test complexity. |
| Auto power-down | 3µA standby current with CS/DCLK/DIN = +VCC - maintains ultra-low power during touch-idle periods in battery-powered systems. |
Applications
| Personal Digital Assistants (PDAs) | Portable Instruments |
|---|---|
Use Scenario: Resistive touch screen digitization in handheld PDAs with Li-ion battery and LCD display. IC Role / Device Role / Timing Role: Primary touch controller performing X/Y coordinate acquisition, pressure calculation, and battery voltage readback. Use Value: Enables simultaneous position, pressure, and battery health reporting using one IC - reduces component count and firmware overhead. | Use Scenario: Field-deployable multimeter or oscilloscope with touch-enabled UI and long battery runtime. IC Role / Device Role / Timing Role: Analog front-end for touch interface and auxiliary sensor inputs (e.g., temperature probe, ambient light). Use Value: Internal 2.5V reference and 12-bit resolution support accurate auxiliary measurements without external precision references. |
| Point-of-Sale (POS) Terminals | Cellular Phones |
Use Scenario: Retail kiosk or payment terminal with ruggedized resistive touch overlay and AC/DC adapter + battery backup. IC Role / Device Role / Timing Role: Touch controller managing stylus/finger input while monitoring main battery and backup cell voltage. Use Value: Direct 0–6V battery measurement supports dual-power architectures - eliminates separate fuel gauge IC. | Use Scenario: Feature phone with monochrome resistive touchscreen, thermal management, and battery telemetry. IC Role / Device Role / Timing Role: Integrated touch, temperature, and battery monitor - interfaces directly to baseband processor via SPI. Use Value: On-chip TEMP0/TEMP1 diode sensing enables battery thermal derating without external thermistor network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7843E | No internal reference; no battery/temperature/pressure measurement; same 12-bit SAR core and SSOP-16 pinout. | Lacks all auxiliary sensing features - requires external reference, battery divider, and temperature IC for equivalent functionality. | Select only if legacy design reuse is mandatory and auxiliary functions are implemented externally. |
| MAX11803ETL+ | 12-bit SAR, integrated reference, but uses I²C interface and TQFN-32 package - not pin-compatible. | Designed for higher-resolution touch panels (up to 1024×1024); includes built-in gesture engine and FIFO buffer. | Choose when migrating to I²C-based systems or requiring advanced touch processing beyond basic coordinate capture. |
Compared with ADS7843E and MAX11803ETL+, the ADS7846EG4 uniquely combines pin compatibility with the ADS7843, integrated 2.5V reference, and multi-function sensing (battery, temperature, pressure) in SSOP-16 - making it optimal for cost-sensitive, space-constrained upgrades of existing touch designs.
Availability
ADS7846EG4 is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and cellular phones requiring stable component supply and long-term industrial availability.
Supply support for ADS7846EG4 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 precision data converters and human-machine interface solutions.
The ADS7846EG4 belongs to TI's precision touch controller product line, designed specifically for low-power, multi-function resistive touch screen systems in portable and battery-operated equipment.
FAQ
What is the primary function of the ADS7846EG4 in a touch screen system?
The ADS7846EG4 serves as a 12-bit analog-to-digital converter touch screen controller that digitizes X/Y coordinates, touch pressure, battery voltage, and ambient temperature. It integrates drivers for resistive touch panels, an internal 2.5V reference, and SPI/QSPI interface - enabling single-chip touch interface functionality in portable devices. The ADS7846EG4 replaces discrete ADCs, references, and external sensing circuits in compact UI designs.
Does the ADS7846EG4 require an external voltage reference?
No, the ADS7846EG4 includes an internal 2.5V bandgap reference (2.45–2.55V, 15ppm/°C drift) usable for battery monitoring, temperature measurement, and auxiliary input channels. This reference can be disabled to reduce power or overdriven by an external low-impedance source (1V to +VCC). For optimal touch position accuracy, differential reference mode uses touch panel voltages directly - eliminating reliance on any reference voltage.
How does the ADS7846EG4 support battery voltage monitoring?
The ADS7846EG4 monitors battery voltage via its VBAT pin, which connects to an internal 4:1 resistor divider. This allows direct measurement of 0.5V–6.0V battery levels without external components. The resulting 0.125V–1.5V signal is digitized using the internal 2.5V reference. Accuracy is ±2% with external reference or ±3% with internal reference - sufficient for state-of-charge estimation in portable electronics using the ADS7846EG4.
Can the ADS7846EG4 measure temperature without external components?
Yes, the ADS7846EG4 performs on-chip temperature measurement using the PENIRQ diode junction. It supports two modes: calibrated single-point (TEMP0) with ±3°C accuracy and 0.3°C/LSB resolution, or uncalibrated differential (TEMP0/TEMP1) with ±2°C accuracy. No external thermistor or sensor is needed - the ADS7846EG4 uses internal bias currents and ADC channels to derive temperature directly from diode voltage characteristics.
Is the ADS7846EG4 pin-compatible with earlier touch controllers?
Yes, the ADS7846EG4 is 100% pin-compatible with the ADS7843 and drops into the same SSOP-16 socket. Software changes are required to access new features - including battery monitoring, temperature sensing, and touch-pressure calculation - but existing PCB layouts, drivers, and interface logic remain fully reusable. This makes the ADS7846EG4 a seamless hardware upgrade path for legacy ADS7843-based designs.
ADS7846EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Touchscreen:
- 4 Wire Resistive
- Resolution (Bits):
- 12 b
- Interface:
- SPI
- Voltage Reference:
- External, Internal
- Voltage - Supply:
- 2.2V ~ 5.25V
- Current - Supply:
- 500 µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SSOP
ADS7846EG4 FAQ
1.How can I place an order for ADS7846EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7846EG4 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 ADS7846EG4 reliable?
The price and inventory of ADS7846EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7846EG4 is usually 5 days.
3.What payment methods are accepted for ADS7846EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7846EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7846EG4?
ADS7846EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7846EG4 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 ADS7846EG4?
For technical support, including ADS7846EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7846EG4 requirements.
6.How does Aetrix verify that ADS7846EG4 is sourced from the original manufacturer or authorized distributors?
All ADS7846EG4 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 ADS7846EG4 meets industry standards.
7.What is the process for return or replacement of ADS7846EG4?
All ADS7846EG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7846EG4, 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 ADS7846EG4 part is unused and in its original packaging.
Return procedure for ADS7846EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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