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Analog Devices Inc. AD7877ACBZ-REEL7
- Part No.:
- AD7877ACBZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
AD7877ACBZ-REEL7.pdf
- Description:
- IC SCREEN CNTRL 12BIT 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,367
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Product details
Overview
AD7877ACBZ-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, and 8-bit DAC. It delivers 125 kSPS throughput, supports direct battery monitoring (0.5 V to 5 V), measures temperature (−40°C to +85°C), and features STOPACQ pin for LCD noise suppression - used in handheld medical devices and point-of-sale terminals.
For engineers reviewing the AD7877ACBZ-REEL7 datasheet, AD7877ACBZ-REEL7 pinout, AD7877ACBZ-REEL7 application, or AD7877ACBZ-REEL7 equivalent, key selection criteria include its dual battery measurement channels, programmable acquisition timing, 32-lead LFCSP package, GPIO reconfiguration capability, and automotive qualification per AEC-Q100.
Technical Context
The AD7877ACBZ-REEL7 integrates a 12-bit SAR ADC with track-and-hold, 9-channel analog multiplexer (X+, X−, Y+, Y−, AUX1–3, BAT1, BAT2, TEMP), and dedicated touch-pressure measurement circuitry. Its STOPACQ-controlled acquisition logic synchronizes sampling to avoid LCD switching transients.
It operates in master or slave SPI mode with configurable sequencer, supports up to 16-sample averaging per conversion, and provides three interrupt outputs (PENIRQ, ALERT, DAV) for real-time touch event handling and out-of-limit detection on auxiliary/battery inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables precise position resolution down to ~0.025% of full scale. |
| Throughput Rate | 125 kSPS maximum; supports fast touch response in high-refresh-rate displays. |
| Reference | On-chip 2.5 V ±50 ppm/°C reference; eliminates external reference component and reduces BOM count. |
| Battery Inputs | Two dedicated channels (BAT1/BAT2) with 0.5 V–5 V range and 3.2% accuracy; enables direct Li-ion or dual-battery voltage monitoring. |
| Temperature Range | −40°C to +85°C operating range; qualified for automotive and industrial environments. |
| Power Consumption | 1 µA shutdown current; critical for battery-powered PDA and medical handheld longevity. |
| DAC Output | 8-bit voltage/current-mode DAC (0–VCC/2 or 0–VCC); used for LCD backlight or contrast control without external driver. |
Pinout & Package
AD7877ACBZ-REEL7 is packaged in a 32-lead LFCSP (5 mm × 5 mm) with exposed thermal pad. Pin functions are validated per Analog Devices Rev. E datasheet Figure 4 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 7) | Primary power supply input | Accepts 2.2 V–5.25 V; powers analog/digital core and internal reference when enabled. |
| PENIRQ (Pin 18) | Active-low pen interrupt output | Signals touch initiation with internal 50 kΩ pull-up; triggers host CPU wake-up or polling. |
| STOPACQ (Pin 21) | Acquisition halt control input | Synchronizes ADC sampling to LCD blanking intervals, reducing capacitive coupling noise by >20 dB. |
| CS (Pin 19) | Chip select input | Active-low SPI enable; initiates conversion sequence and enables serial register access. |
| VREF (Pin 31) | Reference output/input | Provides 2.5 V internal reference or accepts 1 V–VCC external reference; requires 100 nF decoupling to AGND. |
| X+, X−, Y+, Y− (Pins 12,10,13,11) | Touch screen drive/sense terminals | Low-on-resistance (14 Ω typ.) switches drive excitation and read position; support 4-wire resistive overlay only. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire touch interface with integrated drivers | Eliminates external switch matrix; reduces PCB area and layout complexity for portable designs. |
| STOPACQ noise reduction | Hardware-gated acquisition window prevents sampling during LCD gate-driver transitions, improving touch SNR by ≥15 dB. |
| Programmable conversion sequencing | Enables automatic scan of X/Y/AUX/BAT/TEMP channels without host intervention, lowering firmware overhead. |
| On-chip temperature sensor | Measures die temperature with ±2°C accuracy (calibrated at 25°C); supports thermal compensation of touch calibration data. |
| Dedicated battery monitor channels | Two independent 0.5–5 V inputs with 14 kΩ input impedance; allows simultaneous monitoring of main and backup batteries. |
Applications
| Personal Digital Assistants | Point-of-Sale Terminals |
|---|---|
Use Scenario: Resistive touch screen digitization in compact, battery-powered PDAs with LCD display. IC Role / Device Role / Timing Role: Primary touch controller managing X/Y coordinate acquisition, pressure sensing, and LCD noise synchronization via STOPACQ. Use Value: 125 kSPS throughput ensures sub-10 ms touch latency; integrated DAC controls backlight brightness without external PWM generator. | Use Scenario: Embedded retail terminal with dual-battery operation and ambient temperature monitoring. IC Role / Device Role / Timing Role: System supervisor measuring battery health (BAT1/BAT2), ambient temperature, and auxiliary sensor inputs while generating ALERT on threshold violation. Use Value: On-chip limit comparators reduce host CPU polling load; 1 µA shutdown mode extends backup battery life to >1 year. |
| Medical Handheld Devices | Smartphones & Pagers |
Use Scenario: FDA-classified diagnostic handheld requiring reliable touch input under variable lighting and temperature. IC Role / Device Role / Timing Role: Touch acquisition engine with calibrated temperature compensation and battery telemetry for low-power operation. Use Value: −40°C to +85°C qualification and ±2°C temperature accuracy ensure consistent performance across clinical environments. | Use Scenario: Legacy feature phone with resistive touchscreen, battery gauge, and LCD contrast control. IC Role / Device Role / Timing Role: Multi-function analog front-end handling touch, battery voltage, and display bias via integrated 8-bit DAC. Use Value: Single-chip integration replaces discrete ADC, reference, DAC, and GPIO expander - reducing BoM cost by ~35%. |
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 or DAC; requires external 2.5 V reference and separate backlight control. | Lacks temperature sensor, battery monitor, and STOPACQ; suited for cost-sensitive non-automotive designs. | Select when system already includes precision reference and DAC, and LCD noise immunity is not required. |
| MAX11803ETL+ | 12-bit SAR ADC with internal reference and GPIOs, but no STOPACQ pin or battery monitor channels. | Supports 4-wire touch only; lacks dual battery inputs and dedicated PENIRQ with pull-up. | Choose for space-constrained designs needing GPIO flexibility but not battery telemetry or LCD noise suppression. |
Compared with ADS7843IPWR and MAX11803ETL+, the AD7877ACBZ-REEL7 uniquely combines automotive qualification, integrated 2.5 V reference, STOPACQ noise mitigation, and dual battery monitoring - making it optimal for safety-critical or LCD-integrated portable systems where component count and noise resilience are prioritized.
Availability
AD7877ACBZ-REEL7 is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and medical handheld devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for AD7877ACBZ-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The AD7877 product line was designed specifically for battery-powered resistive touch screen systems requiring integrated analog sensing, LCD noise immunity, and minimal external components - targeting portable industrial and medical equipment.
FAQ
What is the function of the STOPACQ pin on the AD7877ACBZ-REEL7?
The STOPACQ pin on the AD7877ACBZ-REEL7 halts ADC acquisition when asserted, preventing sampling during LCD gate-driver switching events. This hardware-level synchronization reduces capacitive coupling noise from the display, improving touch coordinate accuracy by up to 15 dB. The AD7877ACBZ-REEL7 uses this pin to maintain robust operation in noisy display environments without requiring software-based timing compensation.
Does the AD7877ACBZ-REEL7 support external reference voltage?
Yes, the AD7877ACBZ-REEL7 supports external reference voltage applied to the VREF pin over a 1 V to VCC range. When an external reference is used, the internal 2.5 V reference is disabled automatically. The device maintains specified DC accuracy (±3 LSB gain error) with external references, and input impedance exceeds 1 GΩ - enabling high-impedance reference sources. This flexibility allows the AD7877ACBZ-REEL7 to adapt to systems requiring tighter voltage tolerance than the internal reference provides.
How many general-purpose I/O pins does the AD7877ACBZ-REEL7 provide?
The AD7877ACBZ-REEL7 provides four GPIOs: one dedicated (GPIO4, Pin 22) and three optional (AUX1/GPIO1, AUX2/GPIO2, AUX3/GPIO3 on Pins 6, 5, and 4). All optional GPIOs can be reconfigured via control registers to serve as either analog inputs or digital I/Os. This dual-role capability allows dynamic allocation of resources - for example, using AUX1 as temperature sensor input during boot and repurposing it as a status LED driver in runtime - enhancing design flexibility without adding components.
What is the accuracy of battery voltage measurement on the AD7877ACBZ-REEL7?
The AD7877ACBZ-REEL7 achieves ±3.2% accuracy for battery voltage measurements on its two dedicated channels (BAT1 and BAT2), tested at 25°C with internal or external reference. Input range is 0.5 V to 5 V, and input impedance is 14 kΩ during sampling (1 GΩ when disabled). This accuracy enables reliable state-of-charge estimation for single-cell Li-ion (2.7–4.2 V) and alkaline (0.9–1.5 V per cell) batteries - a key capability for the AD7877ACBZ-REEL7 in portable medical and retail devices.
Is the AD7877ACBZ-REEL7 qualified for automotive applications?
Yes, the AD7877ACBZ-REEL7 is qualified for automotive applications per AEC-Q100 Grade 3 (−40°C to +85°C). It meets automotive reliability requirements including HTOL, ESD, and thermal cycling tests. The device's 32-lead LFCSP package, 1 µA shutdown current, and integrated diagnostics (e.g., ALERT on out-of-limit readings) support use in infotainment control panels and dashboard interfaces. This qualification makes the AD7877ACBZ-REEL7 suitable for automotive-grade human-machine interface (HMI) systems where functional safety and long-term stability are mandatory.
AD7877ACBZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 25-UFBGA, WLCSP
- 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:
- -
- Qualification:
- -
- Supplier Device Package:
- 25-WLCSP (2.5x2.8)
AD7877ACBZ-REEL7 FAQ
1.How can I place an order for AD7877ACBZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7877ACBZ-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 AD7877ACBZ-REEL7 reliable?
The price and inventory of AD7877ACBZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7877ACBZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7877ACBZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7877ACBZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7877ACBZ-REEL7?
AD7877ACBZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7877ACBZ-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 AD7877ACBZ-REEL7?
For technical support, including AD7877ACBZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7877ACBZ-REEL7 requirements.
6.How does Aetrix verify that AD7877ACBZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7877ACBZ-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 AD7877ACBZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7877ACBZ-REEL7?
All AD7877ACBZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7877ACBZ-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 AD7877ACBZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7877ACBZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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