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Microchip Technology CAP1296-1-AIA-TR
- Part No.:
- CAP1296-1-AIA-TR
- Manufacturer:
- Microchip Technology
- Category:
- Sensor, Capacitive Touch
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
CAP1296-1-AIA-TR.pdf
- Description:
- IC TOUCH SENSOR 6CH CAP 10VDFN 3
- Quantity:
- Payment:
- Shipping:
Inventory:30,585
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Product details
Overview
CAP1296-1-AIA-TR from Microchip Technology is a 6-channel capacitive touch sensor controller with integrated proximity detection and signal guard functionality. It features six analog-input-capable sensor channels (CS1–CS6), programmable per-channel touch thresholds, automatic parasitic capacitance calibration, and SMBus/I²C interface. Designed for low-power human-interface applications, it supports Active, Standby, Combo, and Deep Sleep modes - delivering 5 µA typical quiescent current in Deep Sleep.
For engineers reviewing the CAP1296-1-AIA-TR datasheet, CAP1296-1-AIA-TR pinout, CAP1296-1-AIA-TR application, or CAP1296-1-AIA-TR equivalent, key selection considerations include multi-state power management (Standby/Combo/Deep Sleep), signal guard (SG) pin operation for noise-immune proximity sensing, 8 kV HBM ESD rating on all pins, and compatibility with both 3.3 V and 5 V supply rails.
Technical Context
The CAP1296-1-AIA-TR implements a dedicated capacitive sensing front-end with independent base count tracking and delta-C measurement per channel. Its sensing architecture supports dynamic recalibration to compensate for environmental drift and system parasitics, using configurable averaging (1–128 samples), sampling time (1–128 ms), and cycle time (70–1120 ms).
It integrates dual-mode operation: Active state enables full per-channel configuration (individual thresholds, sensitivity, timing), while Standby and Combo states support reduced-power monitoring with shared threshold and optimized gain settings. The CS3/SG pin serves as either a third touch input or a driven signal guard output - actively isolating proximity antennas from conductive interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | 6 independent capacitive inputs (CS1–CS6), each with programmable sensitivity and individual threshold |
| Proximity Support | Configurable on any enabled channel; enhanced by optional signal guard (CS3/SG pin) |
| Power Modes | Active, Standby, Combo, and Deep Sleep - with 5 µA typical current in Deep Sleep, 50 µA in Standby (1 input) |
| Interface | SMBus/I²C compliant at 10–400 kHz; address 0x50 (0101000b); supports Block Read/Write |
| Supply Voltage | 3.0 V to 5.5 V - fully 5 V tolerant on digital I/O pins including SMDATA and SMCLK |
| ESD Rating | 8 kV HBM on all pins - suitable for consumer-facing touch interfaces without external protection |
| Package | 10-pin 3 mm × 3 mm DFN (RoHS-compliant), thermal pad exposed on bottom |
Pinout & Package
Capacitive touch sensor controller housed in a 10-pin, 3 mm × 3 mm DFN package with exposed thermal pad (GND-connected). Pin pitch is 0.5 mm; recommended PCB layout includes 2×3 array of 0.3 mm vias under thermal pad connected to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS1) | Capacitive touch sensor input 1 | Analog input for button/proximity electrode; calibrated baseline tracking and delta-C detection |
| 2 (ALERT#) | Open-drain interrupt output | Active-low alert signal; requires external pull-up; asserts on touch, pattern match, or error condition |
| 3 (SMDATA) | I²C/SMBus bidirectional data line | Open-drain, 5 V tolerant; connects to host controller data bus with pull-up resistor |
| 4 (SMCLK) | I²C/SMBus clock input | 5 V tolerant digital input; requires external pull-up; supports up to 400 kHz clock frequency |
| 5 (VDD) | Positive power supply | Accepts 3.0–5.5 V; powers internal analog/digital blocks and I/O drivers |
| 6 (CS6) | Capacitive touch sensor input 6 | Final channel in 6-input set; supports same calibration, threshold, and timing controls as CS1 |
| 7 (CS5) | Capacitive touch sensor input 5 | Enables multi-button pattern recognition when combined with other CSx inputs |
| 8 (CS4) | Capacitive touch sensor input 4 | Supports proximity detection with Signal Guard when CS3/SG is configured as SG output |
| 9 (CS3 / SG) | Multi-function pin: touch input or signal guard driver | Configurable via register: as CS3 (touch input) or SG (active shield output to isolate proximity antenna) |
| 10 (CS2) | Capacitive touch sensor input 2 | Second channel; supports press-and-hold behavior for volume-like UI functions |
| Bottom Pad (GND) | Ground reference and thermal dissipation path | Must be soldered to solid ground plane; enables thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Signal Guard (SG) Output | Actively drives CS3 pin to shield proximity electrodes from conductive interference - reduces e-field attenuation and improves noise margin |
| Multiple Pattern Touch Recognition | Detects simultaneous presses across user-defined channel combinations; sets dedicated status bit and triggers ALERT# |
| Per-State Sensor Configuration | Independent enable, sensitivity, threshold, and timing registers for Active, Standby, and Combo power modes - enabling hybrid button+proximity UX |
| Automatic Baseline Recalibration | Self-adjusts base capacitance counts during POR, gain/sampling changes, or channel enable - maintains stable touch response over temperature/humidity |
| RF Detection & EMI Blocking | Digital filtering and analog rejection circuitry suppresses RF-induced false touches from nearby transmitters or switching regulators |
| Press-and-Hold Functionality | Configurable long-press detection on any channel - used for secondary UI actions (e.g., mute, brightness step) |
Applications
| Desktop PC Power Button Interface | LCD Monitor Touch Controls |
|---|---|
Use Scenario: Replacing mechanical power buttons on desktop chassis with sealed capacitive pads. IC Role / Device Role / Timing Role: CAP1296-1-AIA-TR acts as primary touch controller - detecting single-press (power on/off) and multi-pattern (reset) events, then asserting ALERT# to embedded controller. Use Value: Eliminates mechanical wear and IP-rated sealing challenges; 8 kV HBM withstands ESD events common in ungrounded metal enclosures. |
Use Scenario: Implementing bezel-integrated volume, brightness, and menu controls on flat-panel displays. IC Role / Device Role / Timing Role: CAP1296-1-AIA-TR manages six discrete touch zones with independent sensitivity tuning - supporting both momentary and press-and-hold gestures. Use Value: Enables thin, seamless front bezels; low 50 µA Standby current extends always-on responsiveness without impacting display power budget. |
| Appliance Control Panel | Consumer Electronics Proximity Wake |
Use Scenario: Adding touch-sensitive control surfaces to microwave ovens, dishwashers, and washing machines. IC Role / Device Role / Timing Role: CAP1296-1-AIA-TR operates in Combo mode - running four buttons in Active state and one proximity channel in Standby - to detect hand approach before full UI activation. Use Value: Reduces standby power vs. full Active mode; signal guard (CS3/SG) prevents false triggers from metal cabinet proximity. |
Use Scenario: Enabling hands-free wake-up in smart speakers or portable audio devices using proximity-sensing. IC Role / Device Role / Timing Role: CAP1296-1-AIA-TR configures CS1–CS2 as proximity channels with high sensitivity and signal guard; wakes host MCU via ALERT# upon hand detection. Use Value: Achieves <5 µA system idle current in Deep Sleep; SMBus interface allows host to reconfigure thresholds dynamically post-wake. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT42QT1070-SSU | 7-channel QTouch IC; no signal guard; fixed 3.3 V only; no Deep Sleep mode (min 12 µA) | Lacks proximity isolation capability and ultra-low-power Deep Sleep - unsuitable for battery-powered proximity wake | Choose for cost-sensitive, single-voltage designs where signal guard and sub-10 µA sleep are not required |
| CY8CMBR2016 | 16-channel CapSense controller; requires PSoC host firmware; no integrated SMBus; higher BOM complexity | Demands external microcontroller for configuration and gesture processing - increases design effort and latency | Choose when scaling beyond 6 channels or requiring custom algorithm extensions; avoid for plug-and-play SMBus integration |
Compared with AT42QT1070-SSU and CY8CMBR2016, the CAP1296-1-AIA-TR delivers unique signal guard functionality, true hardware-based Deep Sleep (5 µA), and direct SMBus register access - reducing firmware overhead and enabling robust proximity sensing in space-constrained consumer housings.
Availability
CAP1296-1-AIA-TR is available at Aetrix Electronics and suitable for desktop PCs, LCD monitors, and appliance control panels requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for CAP1296-1-AIA-TR 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and interface ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The CAP1296 product line targets human-machine interface (HMI) applications requiring reliable, low-power capacitive touch and proximity sensing - designed specifically for consumer, computing, and white-goods markets where mechanical switch replacement is critical.
FAQ
What is the function of the CS3/SG pin on the CAP1296-1-AIA-TR?
The CS3/SG pin on the CAP1296-1-AIA-TR is a dual-function terminal: it operates either as Capacitive Sensor Input 3 (CS3) or as a Signal Guard (SG) output. When configured as SG, it actively drives a shield electrode adjacent to a proximity sensor to isolate the e-field from conductive surfaces - reducing attenuation and improving noise immunity. This mode is selected via register configuration and does not require external components.
Does the CAP1296-1-AIA-TR support both 3.3 V and 5 V operation?
Yes, the CAP1296-1-AIA-TR supports a wide supply range of 3.0 V to 5.5 V on the VDD pin. All digital I/O pins - including SMDATA, SMCLK, and ALERT# - are explicitly rated as 5 V tolerant per the datasheet, enabling direct interfacing with 5 V host controllers without level shifters. This dual-voltage flexibility simplifies integration across legacy and modern system designs.
How does the CAP1296-1-AIA-TR handle environmental drift in touch performance?
The CAP1296-1-AIA-TR handles environmental drift through automatic recalibration: it continuously tracks baseline capacitance on each enabled channel and updates internal base count registers during power-on reset, gain/sampling changes, or channel enable events. This compensates for gradual shifts due to temperature, humidity, or aging - ensuring consistent touch detection without host intervention.
Can the CAP1296-1-AIA-TR detect multi-button press patterns?
Yes, the CAP1296-1-AIA-TR supports Multiple Pattern Touch Recognition: users can define up to eight unique combinations of simultaneously pressed channels (e.g., CS1+CS4, CS2+CS5+CS6). When a configured pattern is detected, the device sets a dedicated status bit in the Interrupt Source register and asserts the ALERT# pin - enabling gesture-based UI responses without host polling overhead.
What is the minimum current draw of the CAP1296-1-AIA-TR in lowest-power mode?
The CAP1296-1-AIA-TR draws 5 µA (typical) in Deep Sleep mode - its lowest-power operational state. In this mode, all capacitive sensing is disabled, but the SMBus interface remains active to allow wake-up via host communication. This current value is measured at 3.135–3.465 V VDD and TA < 40°C, making it suitable for battery-backed or energy-harvesting systems requiring extended idle periods.
CAP1296-1-AIA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 10-VFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Buttons
- Proximity Detection:
- Yes
- Number of Inputs:
- 6
- LED Driver Channels:
- -
- Interface:
- I2C, SMBus
- Resolution:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Current - Supply:
- 500µA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
CAP1296-1-AIA-TR FAQ
1.How can I place an order for CAP1296-1-AIA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for CAP1296-1-AIA-TR 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 CAP1296-1-AIA-TR reliable?
The price and inventory of CAP1296-1-AIA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAP1296-1-AIA-TR is usually 5 days.
3.What payment methods are accepted for CAP1296-1-AIA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAP1296-1-AIA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAP1296-1-AIA-TR?
CAP1296-1-AIA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAP1296-1-AIA-TR 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 CAP1296-1-AIA-TR?
For technical support, including CAP1296-1-AIA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAP1296-1-AIA-TR requirements.
6.How does Aetrix verify that CAP1296-1-AIA-TR is sourced from the original manufacturer or authorized distributors?
All CAP1296-1-AIA-TR 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 CAP1296-1-AIA-TR meets industry standards.
7.What is the process for return or replacement of CAP1296-1-AIA-TR?
All CAP1296-1-AIA-TR units undergo pre-shipment inspection (PSI). If there is an issue with CAP1296-1-AIA-TR, 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 CAP1296-1-AIA-TR part is unused and in its original packaging.
Return procedure for CAP1296-1-AIA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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