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Analog Devices Inc. AD7877WACPZ-REEL7
- Part No.:
- AD7877WACPZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 32-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7877WACPZ-REEL7.pdf
- Description:
- IC SCREEN CNTRL 12BIT 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,070
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Product details
Overview
AD7877WACPZ-REEL7 from Analog Devices is a 12-bit successive approximation ADC touch screen controller with integrated 4-wire resistive touch 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 wake-up-on-touch, and operates from a single 2.7 V to 5.25 V supply in automotive-qualified 32-lead LFCSP packaging.
For engineers reviewing the AD7877WACPZ-REEL7 datasheet, AD7877WACPZ-REEL7 pinout, AD7877WACPZ-REEL7 application, or AD7877WACPZ-REEL7 equivalent, key selection considerations include its STOPACQ noise-reduction capability for LCD-integrated displays, programmable conversion sequencing, temperature measurement accuracy (±2°C), and dual-mode DAC (voltage/current) for backlight or contrast control.
Technical Context
The AD7877WACPZ-REEL7 integrates a track-and-hold ADC with a 9-to-1 analog multiplexer supporting X+/X−/Y+/Y− touch inputs, two battery monitors (BAT1/BAT2), three auxiliary analog inputs (AUX1–AUX3), and an on-die temperature sensor. Its sequencer enables automatic or host-controlled channel scanning with up to 16-sample averaging per conversion.
It features three interrupt outputs (PENIRQ, ALERT, DAV), dedicated GPIO4, and three reconfigurable AUX/GPIO pins. The STOPACQ pin directly gates ADC acquisition timing to suppress LCD switching noise, while the separate VDRIVE rail (1.65 V to VCC) isolates serial interface logic levels from core analog supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit ADC with no missing codes; enables precise position resolution in 4-wire resistive touch systems. |
| Throughput Rate | 125 kSPS; supports fast touch response and multi-channel monitoring in portable UIs. |
| Reference | On-chip 2.5 V ±50 ppm/°C reference; eliminates external reference component and reduces BOM count. |
| DAC | 8-bit voltage/current output DAC; configurable for LCD backlight dimming or contrast control without external circuitry. |
| Supply Range | VCC = 2.7 V to 5.25 V; compatible with Li-ion, Li-poly, and 3.3 V/5 V system rails. |
| Shutdown Current | ≤1 µA; enables ultra-low-power sleep mode for battery-operated handheld devices. |
| Battery Monitor | Two direct channels (0.5 V to 5 V input range); allows simultaneous monitoring of main and backup battery voltages. |
| Temperature Sensor | On-die sensor with ±2°C accuracy (single-conversion method); supports thermal management without external sensors. |
Pinout & Package
AD7877WACPZ-REEL7 is housed in a 32-lead LFCSP (5 mm × 5 mm) with exposed thermal pad. Pin 1 marked; NC pins are unconnected. Exposed pad must be soldered to ground plane for thermal and reliability performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 7) | Analog/digital core supply | Single 2.7 V–5.25 V rail powers ADC, DAC, sequencer, and internal reference; functional down to 2.2 V. |
| VDRIVE (Pin 28) | Serial interface logic supply | Independent voltage rail (1.65 V to VCC) sets SPI I/O thresholds-enables mixed-voltage host interfacing. |
| X+, X−, Y+, Y− (Pins 10, 12, 11, 13) | Touch screen excitation/sense nodes | Low on-resistance switches (14 Ω typ) drive and read 4-wire resistive overlay; support touch-pressure calculation. |
| PENIRQ (Pin 18) | Active-low pen interrupt | Open-drain output with 50 kΩ internal pull-up signals touch detection; wakes host CPU from low-power state. |
| STOPACQ (Pin 21) | ADC acquisition gate | Hardware-controlled pause of sampling during LCD refresh cycles-reduces coupling noise without software overhead. |
| DAV (Pin 24) | Data available flag | Active-low pulse indicates valid conversion result in results register; synchronizes host data reads with ADC completion. |
| ALERT (Pin 23) | Out-of-limit interrupt | Asserts when AUX1, TEMP1, BAT1, or BAT2 exceed user-programmed high/low limits-enables autonomous fault monitoring. |
| AUX1–AUX3 / GPIO1–GPIO3 (Pins 4–6) | Multi-function analog/digital I/O | Configurable as 3× auxiliary ADC inputs (12-bit) or general-purpose digital I/O-supports flexible system expansion. |
Key Features
| Feature | Design Value |
|---|---|
| LCD noise reduction via STOPACQ | Hardware-gated ADC acquisition eliminates need for software synchronization with display frame timing. |
| Programmable conversion sequencing | Host-configurable scan order and delay between conversions-optimizes power vs. responsiveness trade-off. |
| Integrated 2.5 V reference | Stable ±50 ppm/°C reference with <1 µs turn-on time; reduces external component count and layout area. |
| Wake-up-on-touch | PENIRQ output triggers host processor from deep sleep-extends battery life in always-on UI applications. |
| Touch-pressure measurement | Derived from X/Y channel ratio analysis; enables pressure-sensitive UI interactions without additional sensors. |
| Automotive qualification | AEC-Q100 qualified; meets −40°C to +85°C operating range and robustness requirements for in-vehicle HMI. |
Applications
| Personal Digital Assistants | Smart Hand-Held Devices |
|---|---|
Use Scenario: Compact PDA with resistive touch overlay and dual-battery operation. IC Role / Device Role / Timing Role: Primary touch digitizer and system health monitor-acquires X/Y coordinates, measures battery voltage (BAT1/BAT2), and reports temperature. Use Value: Single-chip integration replaces discrete ADC, reference, DAC, and GPIO expanders-reducing PCB area by >40% and BOM cost. | Use Scenario: Ruggedized industrial handheld with LCD display and battery-backed real-time clock. IC Role / Device Role / Timing Role: Touch controller with STOPACQ-synchronized sampling and wake-up-on-touch interrupt generation. Use Value: Hardware STOPACQ pin eliminates firmware-level LCD timing coordination-improving touch accuracy in noisy display environments. |
| Point-of-Sale Terminals | Medical Devices |
Use Scenario: EMV-compliant payment terminal with glove-compatible resistive touchscreen. IC Role / Device Role / Timing Role: Touch acquisition engine with 16-sample averaging and out-of-limit ALERT for battery health monitoring. Use Value: Programmable averaging reduces noise from AC-powered peripherals-ensuring reliable touch registration in retail environments. | Use Scenario: Portable patient monitor with touch UI, battery status display, and ambient temperature logging. IC Role / Device Role / Timing Role: Multi-channel sensor hub-digitizing touch position, battery voltage, and on-die temperature with ±2°C accuracy. Use Value: On-chip temperature sensor eliminates external thermistor calibration-reducing design validation effort and long-term drift risk. |
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 temperature sensor, 16-pin TSSOP package. | Lacks integrated reference, DAC, and system monitoring features-requires external components for full functionality. | Choose ADS7843IPWR only if minimal footprint and lowest cost are prioritized over feature integration and power efficiency. |
| MAX11803ETL+ | 12-bit SAR ADC, integrated 2.5 V reference, no DAC, no STOPACQ pin, 24-pin TQFN package. | Missing STOPACQ hardware noise suppression and wake-up-on-touch-relies on host-driven timing coordination. | Prefer MAX11803ETL+ when LCD noise is negligible and system-level power management suffices for wake-up control. |
Compared with ADS7843IPWR and MAX11803ETL+, AD7877WACPZ-REEL7 provides superior system integration-combining reference, DAC, temperature sensing, STOPACQ, and wake-up-on-touch in one AEC-Q100-qualified LFCSP-reducing total solution size and firmware complexity.
Availability
AD7877WACPZ-REEL7 is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and medical devices requiring stable component supply, automotive-grade reliability, and long-term production continuity.
Supply support for AD7877WACPZ-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, serving industrial, automotive, communications, and healthcare markets.
The AD7877 product line delivers integrated touch screen controllers optimized for battery-powered portable equipment-combining precision ADCs, system monitoring, and LCD noise resilience in compact chip-scale packages.
FAQ
What is the function of the STOPACQ pin on the AD7877WACPZ-REEL7?
The STOPACQ pin on the AD7877WACPZ-REEL7 halts ADC acquisition when asserted, enabling hardware-synchronized suppression of LCD switching noise during touch measurements. This eliminates software-based timing coordination and improves position accuracy in display-integrated systems. The AD7877WACPZ-REEL7 uses this pin to gate the internal track-and-hold phase, ensuring clean sampling windows independent of host processor load.
Does the AD7877WACPZ-REEL7 support both voltage and current output modes for its DAC?
Yes, the AD7877WACPZ-REEL7 DAC supports both voltage and current output modes. Voltage mode provides 0–VCC/2 or 0–VCC range depending on DAC register bits; current mode delivers 0–1000 µA with full-scale set by external resistor ARNG. This dual-mode capability allows the AD7877WACPZ-REEL7 to drive LCD backlights directly or control contrast via current-sink configuration without external amplification.
How does the AD7877WACPZ-REEL7 perform touch-pressure measurement?
The AD7877WACPZ-REEL7 calculates touch pressure by analyzing the ratio of X-layer and Y-layer resistance measurements obtained during sequential excitation. It derives pressure information from the relative change in measured voltages across the four-wire resistive overlay-no external components or calibration are required. This capability is intrinsic to the AD7877WACPZ-REEL7's analog front-end and sequencer architecture.
What is the operating temperature range for the AD7877WACPZ-REEL7?
The AD7877WACPZ-REEL7 is specified for operation from −40°C to +85°C and is qualified for automotive applications per AEC-Q100. Its on-die temperature sensor achieves ±2°C accuracy using the single-conversion method calibrated at 25°C. This rating ensures reliable performance in harsh environments such as vehicle infotainment systems and industrial handhelds where the AD7877WACPZ-REEL7 is commonly deployed.
Can the AD7877WACPZ-REEL7 operate with an external reference voltage?
Yes, the AD7877WACPZ-REEL7 accepts an external reference voltage applied to the VREF pin, supporting 1.0 V to VCC. When using an external reference, the analog input range becomes 0 V to VREF, and gain error is specified relative to that reference. The AD7877WACPZ-REEL7 retains all other functionality-including DAC operation and temperature measurement-while allowing system-level optimization of reference stability, noise, or headroom.
AD7877WACPZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 32-VFQFN Exposed Pad, CSP
- Touchscreen:
- 4 Wire Resistive
- Resolution (Bits):
- 12 b
- Interface:
- SPI
- 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:
- Automotive
- Qualification:
- -
- Supplier Device Package:
- 32-LFCSP-VQ (5x5)
AD7877WACPZ-REEL7 FAQ
1.How can I place an order for AD7877WACPZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7877WACPZ-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 AD7877WACPZ-REEL7 reliable?
The price and inventory of AD7877WACPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7877WACPZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7877WACPZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7877WACPZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7877WACPZ-REEL7?
AD7877WACPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7877WACPZ-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 AD7877WACPZ-REEL7?
For technical support, including AD7877WACPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7877WACPZ-REEL7 requirements.
6.How does Aetrix verify that AD7877WACPZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7877WACPZ-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 AD7877WACPZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7877WACPZ-REEL7?
All AD7877WACPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7877WACPZ-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 AD7877WACPZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7877WACPZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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