My Inquiry
My Account
Texas Instruments ADS7846NG4
- Part No.:
- ADS7846NG4
- Manufacturer:
- Texas Instruments
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7846NG4.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS7846NG4 from Texas Instruments is a 12-bit successive-approximation ADC touch screen controller with integrated 2.5V reference, battery monitoring (0.5V–6V), 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 ADS7846NG4 datasheet, ADS7846NG4 pinout, ADS7846NG4 application, or ADS7846NG4 equivalent, key selection considerations include its TSSOP-16 package compatibility with ADS7843, differential ratiometric mode for touch position accuracy, internal reference power-down control, and dual-diode temperature measurement architecture requiring no external calibration for ±2°C accuracy.
Technical Context
The ADS7846NG4 implements a capacitive redistribution SAR ADC with integrated 6-channel analog multiplexer, on-chip 2.5V bandgap reference (±15ppm/°C drift), and dedicated touch-panel driver switches (X+/Y+ RON = 5Ω, X−/Y− RON = 6Ω). Its digital interface uses a 24-clock-cycle SPI-compatible protocol with configurable SER/DFR bit to select single-ended or differential reference modes.
It supports three distinct analog measurement domains: 4-wire resistive touch position (X/Y/Z), auxiliary input (AUX), battery voltage (VBAT) via internal 4:1 resistor divider, and temperature via two diode junctions (TEMP0/TEMP1) with −2.1mV/°C TC. Conversion timing includes 3-cycle acquisition and 12-cycle conversion, with BUSY and PENIRQ signals enabling interrupt-driven host coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - ensures monotonic response across full scale for precision touch coordinate digitization. |
| Throughput Rate | Up to 125kHz - enables rapid multi-point sampling for responsive touch interfaces in handheld devices. |
| Battery Input Range | 0.5V to 6.0V - allows direct monitoring of Li-ion, NiMH, or alkaline battery packs without external scaling circuitry. |
| Temperature Accuracy | ±2°C (differential method), ±3°C (TEMP0-only) - supports battery thermal management and ambient condition awareness without factory calibration. |
| Reference Voltage | 2.45V to 2.55V (typ 2.50V) - provides stable 12-bit LSB = 610µV scaling for auxiliary, battery, and temperature channels when enabled. |
| Supply Voltage Range | 2.2V to 5.25V - supports operation directly from single-cell Li-ion (3.0–4.2V), 3.3V logic rails, or 5V USB-powered systems. |
| Quiescent Current | 280–650µA (ref off), 780µA (ref on) at 2.7V - enables ultra-low-power touch polling in battery-constrained PDAs and pagers. |
Pinout & Package
TSSOP-16 package (PW suffix), RoHS-compliant, 5mm × 4.4mm footprint with 0.65mm pitch - compatible with standard SMT reflow processes and space-constrained portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC | Power supply (analog & digital) | Single 2.2–5.25V rail powers all internal blocks; decoupling required near pin for noise-sensitive ADC operation. |
| X+, Y+, X−, Y− | Touch panel interface terminals | Low-RON (5–6Ω) CMOS drivers enable direct connection to 4-wire resistive overlay; support both SER and DFR measurement modes. |
| GND | Analog/digital ground reference | Common return for ADC, reference, and touch drivers; must be low-impedance and separated from noisy digital ground where possible. |
| VBAT | Battery monitor input | Internal 4:1 resistor divider scales 0.5–6.0V battery voltage to 0.125–1.5V range for ADC - eliminates external scaling components. |
| AUX | Auxiliary analog input | Direct 0–VREF input channel for external sensors or signals; shares same 12-bit resolution and timing as primary touch channels. |
| VREF | Reference I/O pin | Output of internal 2.5V reference (when enabled) or input for external 1–VCC reference; high-impedance when reference is powered down. |
| PENIRQ | Open-drain pen interrupt | Active-low signal indicates touch detection; requires external 10–100kΩ pull-up to +VCC for proper logic level and debounce. |
| DCLK, DIN, DOUT, CS, BUSY | SPI/QSPI serial interface | 3-wire synchronous interface (DCLK/DIN/DOUT) with chip-select and busy status - compatible with standard microcontroller SPI peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade path | 100% pin- and software-compatible with ADS7843 - enables drop-in replacement in existing designs with only firmware updates for new features. |
| Differential ratiometric mode | SER/DFR = 0 configures +REF/−REF to Y+/Y− or X+/X− - eliminates touch position error from switch RON and panel resistance variation. |
| Integrated battery monitor | On-chip 4:1 resistor divider accepts 0.5–6.0V input - removes need for external voltage dividers and level-shifting in portable power management. |
| Two-point temperature sensing | Uses TEMP0 and TEMP1 diodes with 91× current ratio - achieves ±2°C absolute accuracy without factory calibration or lookup tables. |
| Auto power-down control | PD0/PD1 bits disable reference and ADC between conversions - reduces quiescent current to 3µA (CS/DCLK/DIN = +VCC) for extended battery life. |
Applications
| Personal Digital Assistants (PDAs) | Portable Instrumentation |
|---|---|
Use Scenario: Resistive touch overlay on monochrome or color LCD displays in handheld data collection units. IC Role / Device Role / Timing Role: Primary touch coordinate digitizer with real-time X/Y/Z pressure calculation and battery health reporting. Use Value: Enables accurate stylus input and system-level power management using single IC instead of discrete ADC + reference + supervisor. |
Use Scenario: Field-deployable multimeters, oscilloscopes, or environmental monitors with tactile UI and battery operation. IC Role / Device Role / Timing Role: Simultaneous acquisition of touch position, auxiliary sensor voltage, and internal temperature for calibration compensation. Use Value: Reduces BOM count by integrating touch, battery, and thermal sensing functions - critical for compact, sealed enclosures. |
| Point-of-Sale (POS) Terminals | Cellular Phones (Legacy 2G/3G) |
Use Scenario: Touchscreen kiosks and countertop payment systems with glove-friendly or stylus-based interaction. IC Role / Device Role / Timing Role: High-reliability touch controller supporting multi-touch gesture emulation via Z1/Z2 pressure analysis. Use Value: Delivers consistent coordinate accuracy across wide temperature ranges (−40°C to +85°C) and varying battery voltages. |
Use Scenario: Feature phones with resistive touchscreens, battery fuel gauging, and thermal shutdown protection. IC Role / Device Role / Timing Role: Dual-function device managing both user interface input and system-level power/thermal supervision. Use Value: Eliminates separate battery monitor IC and temperature sensor - saves PCB area and simplifies firmware integration. |
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; identical 12-bit SAR core and TSSOP-16 pinout. | Limited to basic X/Y coordinate digitization only; requires external reference and separate battery/thermal monitoring. | Select when cost sensitivity outweighs feature requirements and legacy design reuse is prioritized. |
| MAX11803A | 12-bit SAR with integrated VREF, but no battery monitor; supports 5-wire touch and higher 200kHz sample rate. | Optimized for larger industrial panels; lacks VBAT input and dual-diode temperature architecture of ADS7846NG4. | Prefer for high-speed multi-touch applications where battery telemetry is handled externally. |
Compared with ADS7846NG4, ADS7843E omits all integrated monitoring functions and requires external components for reference and power management, while MAX11803A trades battery/temperature integration for higher speed and 5-wire support - making ADS7846NG4 uniquely suited for compact, battery-powered 4-wire touch systems needing consolidated system supervision.
Availability
ADS7846NG4 is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and cellular phones requiring stable component supply with long-term industrial temperature support (−40°C to +85°C).
Supply support for ADS7846NG4 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 connectivity technologies for industrial, automotive, and consumer markets.
The ADS7846NG4 belongs to TI's precision data acquisition product line, designed specifically for low-power, multi-function touch interface systems in portable and battery-operated equipment.
FAQ
What is the function of the SER/DFR bit in ADS7846NG4?
The SER/DFR bit selects between single-ended reference (SER) and differential reference (DFR) modes. In DFR mode (SER/DFR = 0), the ADS7846NG4 connects +REF and −REF directly to touch panel drivers (e.g., Y+ and Y−), enabling ratiometric conversion that cancels errors from switch on-resistance and panel resistance variation - essential for accurate X/Y position measurement. This mode is not available when using the internal 2.5V reference.
How does ADS7846NG4 perform battery voltage monitoring?
The ADS7846NG4 monitors battery voltage through the VBAT pin, which connects to an internal 4:1 resistor divider. This scales input voltages from 0.5V to 6.0V down to 0.125V–1.5V for the ADC, eliminating external components. Accuracy is ±2% with external VREF or ±3% using the internal 2.5V reference, and the divider is only active during sampling to minimize power draw.
Can ADS7846NG4 measure temperature without external calibration?
Yes, ADS7846NG4 supports two temperature measurement methods. The differential method (TEMP0 and TEMP1 readings with 91× current ratio) achieves ±2°C accuracy without factory calibration. The single-point TEMP0 method requires one room-temperature calibration store but offers finer 0.3°C/LSB resolution. Both use on-chip diode junctions and require no external sensors.
What package type does ADS7846NG4 use, and is it compatible with ADS7843?
ADS7846NG4 uses the TSSOP-16 (PW) package, identical to the ADS7843E. It is 100% pin-compatible and socket-compatible with ADS7843 - allowing direct hardware replacement. Software updates are required only to enable ADS7846NG4-specific features like battery monitoring, temperature sensing, and pressure measurement.
What is the minimum supply voltage required for full functionality of ADS7846NG4?
The ADS7846NG4 operates over 2.2V to 5.25V, but full specification compliance (including internal 2.5V reference operation) requires ≥2.7V. Below 2.7V, the internal reference is disabled by design; battery monitoring remains functional down to 2.2V using external reference or ratiometric mode, and touch digitization continues with reduced reference headroom.
ADS7846NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
ADS7846NG4 FAQ
1.How can I place an order for ADS7846NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7846NG4 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 ADS7846NG4 reliable?
The price and inventory of ADS7846NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7846NG4 is usually 5 days.
3.What payment methods are accepted for ADS7846NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7846NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7846NG4?
ADS7846NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7846NG4 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 ADS7846NG4?
For technical support, including ADS7846NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7846NG4 requirements.
6.How does Aetrix verify that ADS7846NG4 is sourced from the original manufacturer or authorized distributors?
All ADS7846NG4 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 ADS7846NG4 meets industry standards.
7.What is the process for return or replacement of ADS7846NG4?
All ADS7846NG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7846NG4, 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 ADS7846NG4 part is unused and in its original packaging.
Return procedure for ADS7846NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS7846NG4 Tags
-
TSC2046IPWR
Texas Instruments
-
TSC2007IPWR
Texas Instruments
-
TSC2046EIPWR
Texas Instruments
-
AR1021-I/SS
Microchip Technology
-
AR1020-I/SS
Microchip Technology
-
AR1100-I/MQ
Microchip Technology
-
AR1021T-I/ML
Microchip Technology
-
AR1100T-I/SS
Microchip Technology
-
TSC2003IPWR
Texas Instruments
-
TSC2004IRTJR
Texas Instruments
-
AR1100BRD
Microchip Technology
.jpg)
-
TSC2046IRGVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
