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Analog Devices Inc. AD7877ACP-REEL7
- Part No.:
- AD7877ACP-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 32-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7877ACP-REEL7.pdf
- Description:
- IC ADC 12BIT TOUCHSCREEN 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
AD7877ACP-REEL7 from Analog Devices is a 12-bit successive approximation ADC touch screen controller with integrated 4-wire resistive touchscreen interface, on-chip 2.5 V reference, 8-bit DAC, and dual battery monitor channels (0.5 V to 5 V). It delivers 125 kSPS throughput, supports LCD noise reduction via STOPACQ pin, and operates from a single 2.7 V to 5.25 V supply - ideal for portable medical devices and handheld POS terminals.
For engineers reviewing the AD7877ACP-REEL7 datasheet, AD7877ACP-REEL7 pinout, AD7877ACP-REEL7 application, or AD7877ACP-REEL7 equivalent, key selection considerations include its integrated temperature sensor (−40°C to +85°C), programmable conversion sequencer, 3 auxiliary analog inputs, dedicated PENIRQ interrupt, and dual-package availability in 32-lead LFCSP (5 mm × 5 mm) and 25-ball WLCSP (2.5 mm × 2.8 mm).
Technical Context
The AD7877ACP-REEL7 integrates a track-and-hold ADC with low-on-resistance analog switches (14 Ω typical for X+/Y+/X−/Y−) to drive and sense 4-wire resistive touch screens. Its acquisition phase is externally controllable via STOPACQ to suppress LCD-induced noise during measurement.
It features a user-programmable sequencer supporting automatic or host-triggered conversions, up to 16-sample averaging per channel, variable acquisition time, and first-conversion delay - all configurable via SPI interface. The device supports both internal (2.5 V ±50 ppm/°C) and external reference (1 V to VCC), with analog input range of 0 V to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables precise position resolution in resistive touch systems. |
| Throughput Rate | 125 kSPS - sufficient for real-time multi-point touch sampling in PDA and medical handheld interfaces. |
| Reference | On-chip 2.5 V ±50 ppm/°C reference; eliminates need for external precision reference in space-constrained designs. |
| Battery Monitor | Two direct channels (BAT1/BAT2), 0.5 V–5 V input range, 3.2% accuracy - supports system-level battery health monitoring without signal conditioning. |
| Power Consumption | 1 µA shutdown current; 650 µA typical active current with internal reference enabled - extends battery life in portable equipment. |
| Touch Interface | 4-wire resistive touch support with integrated X+/X−/Y+/Y− drivers and PENIRQ interrupt - reduces BOM count and PCB complexity. |
| DAC Output | 8-bit voltage/current-mode DAC (0–VCC/2 or 0–VCC range); used for LCD backlight or contrast control with 12 µs settling time. |
Pinout & Package
AD7877ACP-REEL7 is packaged in a 32-lead LFCSP (5 mm × 5 mm) with exposed thermal pad. Pin functions are validated per Analog Devices' official pin configuration diagram (Figure 4, Rev. E datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 7) | Primary power supply | 2.7 V–5.25 V single supply; functional down to 2.2 V - compatible with Li-ion and dual-cell alkaline systems. |
| PENIRQ (Pin 18) | Active-low pen interrupt output | Indicates touch detection with internal 50 kΩ pull-up; enables wake-on-touch functionality in low-power states. |
| STOPACQ (Pin 21) | Acquisition halt control input | Synchronizes ADC sampling with LCD refresh to suppress display noise coupling into touch measurements. |
| BAT1/BAT2 (Pins 3, 2) | Dual battery monitor inputs | High-impedance (14 kΩ) inputs with 0.5 V–5 V range - allow direct connection to battery rails without scaling resistors. |
| X+/X−/Y+/Y− (Pins 12, 10, 13, 11) | Touch screen excitation/sense nodes | Low 14 Ω on-resistance switches enable accurate voltage division across resistive layers with minimal error. |
| DIN/DOUT/DCLK/CS (Pins 19, 27, 26, 18) | SPI serial interface | Standard 4-wire SPI (slave mode); DOUT high-impedance when CS high - supports shared bus architectures. |
| VDRIVE (Pin 28) | Digital I/O voltage reference | Independent logic level setting (1.65 V–VCC) - allows interfacing with 1.8 V or 3.3 V host processors without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Measures ambient temperature from −40°C to +85°C with ±2°C accuracy (single-conversion method), eliminating need for external sensor in thermal-aware UI systems. |
| Programmable conversion sequencer | Automatically cycles through touch, battery, auxiliary, and temperature channels - reduces host CPU overhead and firmware complexity. |
| LCD noise suppression | STOPACQ pin halts ADC acquisition during LCD active periods - improves touch coordinate repeatability in display-integrated devices. |
| Touch-pressure measurement | Derives Z-axis pressure from X/Y layer resistance ratio - enables pressure-sensitive UI gestures without additional hardware. |
| GPIO flexibility | Four GPIOs (one dedicated, three reconfigurable AUX pins) support system-level control, status reporting, or peripheral interfacing. |
Applications
| Medical Handheld Diagnostics | POS Terminal Touch Interface |
|---|---|
|
Use Scenario: Portable ultrasound or glucose meter with resistive touch overlay requiring reliable finger/stylus detection under varying lighting and environmental conditions. IC Role / Device Role / Timing Role: Primary touch digitizer and system monitor - acquires X/Y coordinates, measures battery voltage, and reports temperature for calibration compensation. Use Value: Integrated 2.5 V reference and 12-bit resolution ensure consistent touch accuracy across battery discharge; STOPACQ prevents LCD interference during critical measurement windows. |
Use Scenario: Retail point-of-sale terminal with integrated resistive touchscreen and dual-battery backup for continuous operation during power outages. IC Role / Device Role / Timing Role: Touch controller and power supervisor - detects stylus contact, monitors main/backup battery levels, and triggers alerts on low-voltage thresholds. Use Value: Direct 0.5 V–5 V battery input range and 3.2% accuracy enable real-time state-of-charge estimation; PENIRQ wake-up reduces system standby current. |
| Smart Industrial HMI | Automotive Infotainment Panel |
|
Use Scenario: Ruggedized factory-floor human-machine interface with glove-compatible resistive touch and ambient temperature logging. IC Role / Device Role / Timing Role: System sensor hub - sequences touch, temperature, and auxiliary analog inputs (e.g., enclosure humidity sensor) at programmable intervals. Use Value: On-chip temperature sensor and 3 auxiliary inputs consolidate sensing functions; 125 kSPS throughput supports responsive UI updates even with multi-channel averaging. |
Use Scenario: In-vehicle infotainment display with resistive touch overlay operating across automotive temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Automotive-qualified touch acquisition IC - provides X/Y coordinates, battery rail monitoring, and thermal safety feedback to MCU. Use Value: AEC-Q100 qualification ensures reliability; integrated DAC controls LCD contrast dynamically based on ambient light sensor input routed through AUX channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7843IPWR | 12-bit SAR ADC, no on-chip reference, no DAC, no battery monitor; requires external 2.5 V reference and separate power management. | Lacks integrated reference, temperature sensor, and battery channels - suitable only where BOM cost is prioritized over integration. | Choose ADS7843IPWR only if design already includes precision reference and external battery monitoring circuitry. |
| TSC2007IPWPR | 12-bit ADC with integrated reference and temperature sensor, but no DAC or battery monitor; supports 4-wire touch only (no auxiliary inputs). | Missing dual battery monitor and 8-bit DAC - cannot replace AD7877ACP-REEL7 in systems requiring LCD backlight control or battery health tracking. | Select TSC2007IPWPR when touch-only functionality suffices and auxiliary sensing is handled elsewhere. |
Compared with ADS7843IPWR and TSC2007IPWPR, AD7877ACP-REEL7 offers higher integration (reference, DAC, battery monitor, temperature sensor, 3 AUX inputs), enabling smaller PCB area and reduced firmware complexity in portable and automotive touch systems.
Availability
AD7877ACP-REEL7 is available at Aetrix Electronics and suitable for medical handheld diagnostics, POS terminal touch interfaces, and smart industrial HMI requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for AD7877ACP-REEL7 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The AD7877ACP-REEL7 belongs to Analog Devices' precision data acquisition product line, engineered specifically for integrated touch screen control in battery-powered portable and automotive systems with stringent size, power, and reliability requirements.
FAQ
What is the package type and footprint of AD7877ACP-REEL7?
AD7877ACP-REEL7 uses a 32-lead LFCSP package measuring 5 mm × 5 mm with an exposed thermal pad. This compact, thermally enhanced footprint is optimized for space-constrained portable electronics and supports automated reflow assembly. The part is also offered in a 25-ball WLCSP (2.5 mm × 2.8 mm), but AD7877ACP-REEL7 specifically denotes the LFCSP variant per Analog Devices' ordering guide.
Does AD7877ACP-REEL7 support both internal and external voltage references?
Yes, AD7877ACP-REEL7 supports dual reference modes: an on-chip 2.5 V ±50 ppm/°C reference (available on VREF pin) or an external reference applied to the same pin within 1 V to VCC. When using the internal reference, it can be disabled to reduce power consumption; external reference mode allows full-scale input range adjustment while maintaining 12-bit linearity.
How does the STOPACQ pin function in AD7877ACP-REEL7?
The STOPACQ pin on AD7877ACP-REEL7 halts ADC acquisition when asserted, preventing sampling during LCD refresh cycles that induce noise on touch electrodes. This feature is critical for maintaining coordinate accuracy in display-integrated devices. The pin is sampled synchronously with the internal clock, and acquisition resumes automatically upon deassertion - no register programming required.
Can AD7877ACP-REEL7 measure touch pressure, and how is it implemented?
Yes, AD7877ACP-REEL7 supports touch-pressure measurement by calculating the resistance ratio between X-layer and Y-layer voltages - a method derived from the relative on-resistance of the touched point. This Z-axis estimation requires no additional components and is computed internally using standard touch sequence data, enabling pressure-sensitive UI interactions without extra sensors or firmware math.
What are the GPIO capabilities of AD7877ACP-REEL7?
AD7877ACP-REEL7 provides four GPIOs: one dedicated (GPIO4, Pin 22) and three reconfigurable (AUX1/GPIO1, AUX2/GPIO2, AUX3/GPIO3 on Pins 6, 5, 4). All support input/output direction control and interrupt generation. AUX pins double as analog inputs when not configured as GPIOs - offering flexible resource allocation for system-level signaling or sensor interfacing without external logic.
AD7877ACP-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 32-VFQFN Exposed Pad, CSP
- Touchscreen:
- -
- Resolution (Bits):
- 12 b
- Interface:
- -
- Voltage Reference:
- External, Internal
- Voltage - Supply:
- 2.7V ~ 5.25V
- Current - Supply:
- 1 µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-LFCSP-VQ (5x5)
AD7877ACP-REEL7 FAQ
1.How can I place an order for AD7877ACP-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7877ACP-REEL7 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 AD7877ACP-REEL7 reliable?
The price and inventory of AD7877ACP-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7877ACP-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7877ACP-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7877ACP-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7877ACP-REEL7?
AD7877ACP-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7877ACP-REEL7 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 AD7877ACP-REEL7?
For technical support, including AD7877ACP-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7877ACP-REEL7 requirements.
6.How does Aetrix verify that AD7877ACP-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7877ACP-REEL7 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 AD7877ACP-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7877ACP-REEL7?
All AD7877ACP-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7877ACP-REEL7, 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 AD7877ACP-REEL7 part is unused and in its original packaging.
Return procedure for AD7877ACP-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7877ACP-REEL7 Tags
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