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Texas Instruments ADS7846N/2K5G4
- Part No.:
- ADS7846N/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7846N/2K5G4.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
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Product details
Overview
ADS7846N/2K5G4 from Texas Instruments is a 12-bit successive-approximation ADC touch screen controller with integrated 2.5V reference, battery monitoring (0.5V–6.0V), on-chip temperature sensing (–40°C to +85°C), 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 in TSSOP-16 package for resistive touch systems.
For engineers reviewing the ADS7846N/2K5G4 datasheet, ADS7846N/2K5G4 pinout, ADS7846N/2K5G4 application, or ADS7846N/2K5G4 equivalent, key selection considerations include its ratiometric differential reference mode for touch position accuracy, internal reference power-down (3µA), 12-bit no-missing-codes performance, and direct compatibility with ADS7843 layouts.
Technical Context
The ADS7846N/2K5G4 implements a capacitive redistribution SAR architecture with integrated 6-channel analog multiplexer, on-chip 2.5V bandgap reference (±2mV drift, 15ppm/°C), and low-on-resistance touch panel drivers (X+/Y+: 5Ω, X–/Y–: 6Ω). Its differential reference mode connects +REF/–REF directly to Y+/Y– or X+/X– to enable ratiometric conversion, eliminating switch resistance error in position measurement.
It supports two temperature measurement methods: single-point TEMP0 diode reading (0.3°C resolution) and dual-current differential method (±2°C accuracy, no calibration), plus battery voltage scaling via internal 4:1 resistor divider. Conversion timing uses 12 clock cycles for acquisition and 12 for SAR, with BUSY signal indicating active conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - ensures monotonic response across full scale for reliable touch coordinate digitization. |
| Throughput Rate | Up to 125kHz - enables rapid multi-point sampling for responsive touch interfaces in portable devices. |
| Reference Voltage | Internal 2.45–2.55V (typ 2.50V) - powers auxiliary, battery, and temperature channels; can be disabled to reduce quiescent current to 280µA. |
| Battery Input Range | 0.5V to 6.0V - measures battery voltage post-regulator via internal 4:1 divider, supporting wide-input DC/DC systems. |
| Temperature Accuracy | ±2°C (differential method), ±3°C (TEMP0) - enables thermal management in handhelds without external sensor. |
| Supply Voltage Range | 2.2V to 5.25V - allows operation directly from Li-ion, NiMH, or regulated 3.3V/5V rails without level-shifting. |
| Power-Down Current | 3µA (CS = DCLK = DIN = +VCC) - extends battery life in idle states of PDAs and cellular handsets. |
Pinout & Package
TSSOP-16 package with 0.65mm pitch; thermally enhanced for portable applications; RoHS-compliant; specified over –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 14) | Power supply input | Dual power pins reduce IR drop and improve noise immunity for analog/digital sections. |
| X+, X–, Y+, Y– | Touch panel interface | Low-RON (5–6Ω) switches drive and sense resistive touch layers; support ratiometric measurement. |
| PENIRQ | Open-drain interrupt output | Signals touch detection; requires external 10kΩ–100kΩ pull-up; active-low, high-impedance when CS high. |
| VREF | Reference I/O | 2.5V output when internal ref enabled; accepts external 1.0V–+VCC reference; impedance 250Ω (on), 1GΩ (off). |
| VBAT | Battery monitor input | Internally divided 4:1; 10kΩ input impedance during sampling; enables direct battery health monitoring. |
| AUX | Auxiliary analog input | Supports external sensors (e.g., light, humidity); shares same 12-bit ADC path and reference. |
| DCLK, DIN, DOUT, CS, BUSY | SPI/QSPI interface | 3-wire serial protocol with busy flag; DOUT high-impedance when CS high; supports 24-clock conversion cycle. |
Key Features
| Feature | Design Value |
|---|---|
| ADS7843 pin compatibility | 100% pin-to-pin and socket-compatible - enables drop-in upgrade with only firmware changes required. |
| Ratiometric differential reference | Eliminates touch panel driver RON error by using Y+/Y– or X+/X– as reference inputs - improves position linearity. |
| Integrated temperature sensor | Dual-diode method (TEMP0/TEMP1) provides calibrated ambient temperature without external components. |
| Direct battery monitoring | 0.5V–6.0V input range with internal scaling - monitors battery pre-regulator for state-of-charge estimation. |
| Touch-pressure calculation support | Enables Z1/Z2 cross-panel measurements via MUX control - computes touch resistance for pressure discrimination. |
Applications
| Personal Digital Assistants | Portable Instruments |
|---|---|
Use Scenario: Resistive touch screen digitization in handheld PDAs with battery-powered operation and space-constrained PCB layout. IC Role / Device Role / Timing Role: Primary touch controller performing X/Y position, pressure, and temperature acquisition with SPI host interface. Use Value: Integrated 2.5V reference and ratiometric mode eliminate external precision references, reducing BOM count and layout area. | Use Scenario: Field-deployable test equipment requiring accurate ambient temperature compensation and battery health monitoring. IC Role / Device Role / Timing Role: Multi-function analog front-end handling auxiliary sensor inputs, battery voltage tracking, and thermal derating logic. Use Value: Single-chip solution replaces discrete ADC + reference + temp sensor, cutting assembly cost and calibration effort. |
| Point-of-Sale Terminals | Cellular Phones |
Use Scenario: Touch-enabled retail kiosks operating in variable ambient temperatures with long-term reliability requirements. IC Role / Device Role / Timing Role: Touch coordinate processor with PENIRQ-driven wake-up and low-power auto shutdown between touches. Use Value: 3µA power-down current extends uptime in always-on deployments; ±2°C temp accuracy supports thermal safety compliance. | Use Scenario: Compact smartphone designs integrating touch, battery telemetry, and thermal feedback in shared system-on-chip subsystems. IC Role / Device Role / Timing Role: Secondary ADC subsystem managing non-core analog signals while minimizing SoC ADC loading. Use Value: TSSOP-16 footprint fits tight board real estate; 2.2V minimum supply supports aging battery operation down to 2.5V. |
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; 12-bit, 125kHz, SSOP-16 | Lacks integrated monitoring features; requires external reference and separate temp/battery ICs | Select when legacy compatibility is critical and added features are unnecessary. |
| MAX11803A | 12-bit, 100kHz max rate; integrated VREF; supports 4-/5-/8-wire panels; QFN-24 | Higher pin count; different SPI framing; no direct battery monitor input | Choose for multi-panel type flexibility and higher integration density where TSSOP-16 is not required. |
Compared with ADS7846N/2K5G4, ADS7843E omits all integrated monitoring functions and requires external reference circuitry, while MAX11803A offers broader panel support but lacks the dedicated 0.5V–6.0V battery input and identical pinout - making ADS7846N/2K5G4 optimal for ADS7843 drop-in upgrades with enhanced functionality.
Availability
ADS7846N/2K5G4 is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and cellular phones requiring stable component supply, long-lifecycle support, and automotive-grade temperature tolerance.
Supply support for ADS7846N/2K5G4 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 with broad industrial and consumer design infrastructure.
The ADS7846N/2K5G4 belongs to TI's precision data acquisition product line, engineered specifically for low-power, high-accuracy resistive touch screen systems in portable and battery-operated equipment.
FAQ
What is the operating voltage range for the ADS7846N/2K5G4?
The ADS7846N/2K5G4 operates from 2.2V to 5.25V, with specified performance from 2.7V to 3.6V. Its extended 2.2V lower limit enables reliable function under degraded battery conditions in portable devices, while the 5.25V upper limit accommodates 5V system rails without regulation.
Does the ADS7846N/2K5G4 require an external reference voltage?
No - the ADS7846N/2K5G4 includes an internal 2.5V reference (2.45–2.55V) usable for auxiliary, battery, and temperature channels. It can be disabled to reduce quiescent current. External reference (1.0V to +VCC) is optional and used only when higher precision or ratiometric touch measurement is not required.
How does the ADS7846N/2K5G4 support touch pressure measurement?
The ADS7846N/2K5G4 supports touch pressure calculation via Z1/Z2 cross-panel measurements using its 6-channel MUX. By digitizing X-position, Y-position, and two diagonal resistance values, it computes touch resistance using documented equations - enabling pressure discrimination without additional hardware.
Is the ADS7846N/2K5G4 pin-compatible with the ADS7843?
Yes - the ADS7846N/2K5G4 is 100% pin-compatible with the ADS7843 and drops into the same socket. Software changes are required to access new features (battery, temperature, pressure), but PCB layout and interconnect remain unchanged.
What temperature ranges and accuracies does the ADS7846N/2K5G4 support for on-chip sensing?
The ADS7846N/2K5G4 supports ambient temperature measurement from –40°C to +85°C. It offers two modes: TEMP0 single-diode reading (±3°C accuracy, 0.3°C/LSB resolution) and differential TEMP0/TEMP1 method (±2°C accuracy, no calibration required).
ADS7846N/2K5G4 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
ADS7846N/2K5G4 FAQ
1.How can I place an order for ADS7846N/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7846N/2K5G4 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 ADS7846N/2K5G4 reliable?
The price and inventory of ADS7846N/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7846N/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7846N/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7846N/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7846N/2K5G4?
ADS7846N/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7846N/2K5G4 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 ADS7846N/2K5G4?
For technical support, including ADS7846N/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7846N/2K5G4 requirements.
6.How does Aetrix verify that ADS7846N/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7846N/2K5G4 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 ADS7846N/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7846N/2K5G4?
All ADS7846N/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7846N/2K5G4, 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 ADS7846N/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7846N/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS7846N/2K5G4 Tags
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