ADS7841E/2K5

Introduction to ADS7841E/2K5
- The ADS7841E/2K5 is TI’s 12‑bit, serial (SPI‑style) ADC/touch‑screen controller designed for low‑cost data acquisition and resistive touch applications.
- The “2K5” suffix indicates a 2.5 V reference; the “E” denotes extended industrial temperature range.
- It combines a input multiplexer, a sample/hold, and a 12‑bit ADC in a compact package, with a simple clocked serial interface.
- Conversions are triggered by a chip select and clocked out serially; it supports multiple input channels via the multiplexer (suitable for X/Y touch readings and other multi‑channel sensing).
- Features include low power consumption, monotonic 12‑bit resolution, and straightforward software interface.
- Applications: resistive touch screens, portable instrumentation, sensor front ends, and other multi‑channel data acquisition tasks.

Equivalent parts (12‑bit, 4‑wire resistive touch A/D with SPI):
- Analog Devices: AD7841/AD7843/AD7845
- Texas Instruments: TSC2046
- XPT2046 (popular drop‑in touch‑screen controller)

Here are concise features of ADS7841E/2K5:
- 12-bit A/D with multiplexed inputs for resistive touch screens (X and Y, plus Z/pressure when used)
- SPI-compatible serial interface (CLK, DIN, DOUT, CS)
- ADS7841E standard version + ADS7841E/2K5 with internal 2.5 V reference (2K5); external reference option available
- Wide operating supply: 2.7 V to 5.25 V; low power consumption with power-down modes
- Integrated sample-and-hold and input buffer
- Four analog inputs (configured as differential pairs for X and Y)
- Internal protection features suitable for touch-screen use; small package options available
- Suitable for single-supply microcontroller interfaces and simple interfacing to resistive touch panels
Note: For exact electrical specs, timing, and package options, please refer to the current TI datasheet.

ADS7841E/2K5 is a 16-pin SPI-style touchscreen controller (SOIC/TSSOP-16).
Pin functions (grouped):
- X+, X-, Y+, Y-: four touchscreen electrode inputs (connect to a resistive touchscreen).
- VCC: supply voltage.
- GND: ground.
- CS: chip-select for SPI.
- SCLK: serial clock.
- DIN: serial data input.
- DOUT: serial data output.
- PENIRQ: pen interrupt output (touch detected).
Notes: package variants may have NC or other power pins depending on exact package; the core interface is SPI-like with the four touch pins provided for the 4-wire touchscreen.

Manufacturer: Analog Devices, Inc. (ADI).
What kind of company: A multinational semiconductor company that designs and manufactures high-performance analog, mixed-signal, and DSP integrated circuits and related systems for various industries (industrial, communications, automotive, consumer, medical, etc.).

Typical application areas for ADS7841E/2K5:
- Resistive touch-screen interfaces in handhelds, POS terminals, kiosks, ATMs, and consumer devices.
- Human–machine interfaces (HMI) in industrialControls, instrumentation, and medical/lab equipment.
- Automotive touch panels and infotainment displays.
- Portable measurement and data-collection instruments needing X–Y position sensing.
- Household appliances and other consumer electronics with touch-input controls.
These devices benefit from the ADS7841E/2K5’s integrated touch-screen A/D conversion for accurate X/Y readings.

ADS7841E/2K5 comes in a 28-pin plastic SOIC (Small-Outline) package.