CAP1126-1-AP-TR - 6-Channel Capacitive Touch Sensor, 2 LED Drivers | Microchip
Référence : CAP1126-1-AP-TR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.65 | $1,65 |
| 10 | $1.48 | $14,80 |
| 100 | $1.32 | $132,00 |
| 500 | $1.2 | $600,00 |
| 1 000 | $1.05 | $1 050,00 |
| 5 000 | $0.92 | $4 600,00 |
CAP1126-1-AP-TR Présentation
A capacitive touch sensor is a solid-state device that detects the presence of a finger (or conductive object) by measuring the change in capacitance on an electrode. In the system hierarchy, the CAP1126 belongs to the capacitive sensor IC category, sitting above simple mechanical switches and below full touchscreen controllers. Compared with mechanical buttons, capacitive touch sensors offer sealed, aesthetically pleasing surfaces, no moving parts, and longer operational life, while still being lower complexity and lower cost than projected capacitive touchscreens.
Key features include 6 independent capacitive touch inputs with programmable sensitivity, automatic recalibration to compensate for environmental drift, 2 LED drivers supporting on/off, variable-rate blinking, breathing, and dimming effects, an I2C/SMBus-compatible interface, and Multiple Pattern Touch recognition that reports simultaneous button presses as a distinct event. The integrated proximity-detection circuitry enables wake-on-approach operation, reducing system power consumption when no user is present.
Technically, the CAP1126 uses a charge-transfer-based sigma-delta conversion technique for each sensor channel, providing high noise immunity against power-line and RF interference. Its automatic recalibration loop continuously adjusts the sensor baseline so that slow environmental changes (humidity, temperature) do not produce false triggers. The device operates from a single 3.0V to 3.6V rail, draws approximately 500 uA active supply current, and offers programmable interrupt signaling to the host MCU.
Typical applications include consumer electronics front panels, white goods and appliance control surfaces, notebook and tablet button strips, industrial control keypads, and IoT devices requiring simple, sealed touch interfaces with visual LED feedback. The 2 integrated LED drivers directly drive indicator LEDs without external transistors.
When designing with this device, ensure the touch sensor PCB pads are routed with adequate ground isolation and follow the Microchip Touch Sensor Design Guide layout recommendations. The I2C address is hardware-fixed on the -1 variant (0x28); verify bus conflicts with other peripherals on the same I2C bus.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing unique value for both component selection and board bring-up.
Alternatives de remplacement direct pour CAP1126-1-AP-TR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
CAP1126-2-AP-TR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CAP1126-3-AP-TR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CAP1126-1-AP-TR Valeurs maximales et caractéristiques électriques
| Touch Sensor Channels | 6 |
| Type de capteur | Capacitive (charge-transfer / sigma-delta) |
| LED Drivers | 2 (on/off, blink, breathing, dimming) |
| Interface | I2C / SMBus-compatible |
| I2C Address (-1 variant) | 0x28 (7-bit, hardware-fixed) |
| Supply Voltage (VDD) | 3.0 V to 3.6 V |
| Supply Current (active) | 500 uA (typical) |
| Programmable Sensitivity | Yes (per-channel) |
| Automatic Recalibration | Yes (per-channel environmental compensation) |
| Multiple Pattern Touch | Yes (simultaneous-button recognition) |
| Proximity Detection | Yes (sensor-input based) |
| Température de fonctionnement | -40 C to +85 C |
| Boîtier | 16-pin QFN (4x4 mm) |
| Type de montage | Surface Mount |
| Niveau MSL | 3 (168 hours) |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de CAP1126-1-AP-TR
| Broche 1 | CS1 — Capacitive sensor input 1 |
| Broche 2 | CS2 — Capacitive sensor input 2 |
| Broche 3 | CS3 — Capacitive sensor input 3 |
| Broche 4 | CS4 — Capacitive sensor input 4 |
| Broche 5 | CS5 — Capacitive sensor input 5 |
| Broche 6 | CS6 — Capacitive sensor input 6 |
| Broche 7 | VDD — Power supply (3.0 V to 3.6 V) |
| Broche 8 | GND — Ground |
| Broche 9 | SDA — I2C data |
| Broche 10 | SCL — I2C clock |
| Broche 11 | INT — Interrupt output (active low, open-drain) |
| Broche 12 | LED1 — LED driver output 1 |
| Broche 13 | LED2 — LED driver output 2 |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | EP — Exposed pad (thermal/ground, solder to PCB) |
Applications typiques
CAP1126-1-AP-TR convient pour 7 applications: Consumer Electronics Front Panels, White Goods / Home Appliance Control, Industrial Control Keypads, Notebook / Tablet Button Strips, IoT Smart-Home Devices, Medical / Wellness Device Interfaces, Automotive Interior Button Replacement.
Consumer Electronics Front Panels
The CAP1126-1-AP-TR is well-suited for sealed front-panel button replacement on consumer devices such as audio amplifiers, set-top boxes, and smart speakers. Its 6 capacitive touch channels replace 6 mechanical push-buttons with a single solid-state IC, eliminating moving parts and enabling IP-rated sealed designs. The 2 integrated LED drivers directly indicate status with breathing or blink patterns without external transistors, reducing BOM cost. Operates at 3.3 V from a typical system rail, drawing 500 uA - negligible compared to the LED and host MCU budget.
Recommandé
White Goods / Home Appliance Control
The CAP1126-1-AP-TR's 6-channel capacity covers the typical button count of washing machines, dishwashers, microwave ovens, and induction cooktops. Its -40 C to +85 C operating range supports unheated enclosure locations, and RightTouch® automatic recalibration compensates for humidity and temperature swings common in laundry and kitchen environments. The I2C/SMBus interface integrates with low-cost appliance MCUs; the 2 LED drivers handle indicator and status lighting directly. Charge-transfer sensing rejects mains-line and motor noise typical of appliance EMC environments.
Recommandé
Industrial Control Keypads
For industrial HMI panels, the CAP1126-1-AP-TR delivers sealed capacitive touch input that resists dust, oil, and cleaning chemicals that mechanical keypads cannot survive. Its automatic recalibration handles slow environmental drift from temperature cycling in factory-floor equipment. The device's proximity-detection mode enables wake-on-approach to light the panel only when needed, reducing standby power. With I2C addressing variants (0x28 / 0x29 / 0x2A), multiple CAP1126 devices can coexist on one bus for larger keypad arrays.
Recommandé
Notebook / Tablet Button Strips
The CAP1126-1-AP-TR's 4x4 mm QFN-16 footprint is small enough for the volume and power-button strips found on notebook computers, tablets, and 2-in-1 convertibles. Its 6 channels cover power, volume up/down, brightness, and rotation-lock buttons, while the 2 LED drivers provide Caps-Lock and power-status indication. The 3.0-3.6 V supply aligns with the system 3.3 V rail, and 500 uA supply current is negligible next to the platform's total power budget. Pattern recognition reports multi-button combos (e.g. Vol-Up + Power) without host-side firmware debouncing.
Recommandé
IoT Smart-Home Devices
Smart-home hubs, wireless wall switches, and connected lighting controllers benefit from the CAP1126-1-AP-TR's combination of 6 touch inputs and 2 LED drivers in a tiny 16-QFN. Designers can implement local touch control with LED feedback while the wireless MCU handles cloud connectivity. The proximity-detection wake-on-approach feature keeps the radio in deep sleep until a user approaches, extending battery life in wireless wall-switch and doorbell applications. The hardware I2C address (0x28) simplifies firmware and avoids address-strapping pins.
Recommandé
Medical / Wellness Device Interfaces
Medical and wellness devices (blood-pressure cuffs, glucose meters, handheld diagnostic tools) require sealed, easily-cleaned user interfaces - exactly what the CAP1126-1-AP-TR provides. Its 6 touch channels support power, mode-select, memory-scroll, and OK/Cancel buttons, while 2 LED drivers provide status indication. The device's high noise immunity (per RightTouch® technology) prevents false triggers from medical-grade electrosurgical and RF emissions environments. The 16-QFN 4x4 mm package suits the compact PCBs typical of handheld medical enclosures.
Recommandé
Automotive Interior Button Replacement
While the CAP1126-1-AP-TR itself is not AEC-Q100 qualified, its feature set is highly relevant for non-safety automotive interior applications such as steering-wheel button strips, overhead-console controls, and rear-seat entertainment panels. The 6 touch inputs cover typical steering-wheel button counts (volume, track, mode, phone, voice), and the 2 LED drivers illuminate backlit icons. Designers targeting AEC-Q100 must use the automotive-grade sister part if available; otherwise the industrial-grade CAP1126-1-AP-TR serves well in non-critical interior domains.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour CAP1126-1-AP-TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | CAP1126-2-AP-TR | CAP1126-3-AP-TR | CAP1133-1-AIA-TR | AT42QT2120-MMHR | CAP1106-1-AIA-TR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology (same brand) | Microchip Technology (same brand) | Microchip Technology (same brand) | Microchip Technology (same brand) | Microchip Technology (same brand) |
| Package | 16-QFN (4x4 mm) | 16-QFN (4x4 mm) - same | 16-QFN (4x4 mm) - same | 10-MSOP - differs | 20-VQFN - differs | 10-MSOP - differs |
| Touch Channels | 6 | 6 (same) | 6 (same) | 3 (-50%) | 12 (+100%) | 6 (same) |
| LED Drivers | 2 | 2 (same) | 2 (same) | 2 (same) | 0 | 0 |
| Auto Recalibration | Yes | Yes (same) | Yes (same) | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Principaux différenciateurs
- Industry-standard Microchip RightTouch® technology with proven EMC immunity (vs AT42QT2120-MMHR)
- Integrated 2 LED drivers eliminate external transistors (vs CAP1106-1-AIA-TR)
- 16-QFN (4x4 mm) compact footprint with 6 channels + 2 LEDs (vs CAP1133-1-AIA-TR)
Notes de conception
Follow Microchip's Touch Sensor Design Guide for PCB layout of the CAP1126-1-AP-TR sensor pads. Use a minimum 4 mm x 4 mm pad size with a clearance gap of at least 1 mm between adjacent pads, route sensor traces on the top layer only with minimal length, surround each pad with a ground hatch (50% fill, 0.5 mm pitch), and place a 1 uF X7R ceramic decoupling capacitor within 3 mm of the VDD pin. Avoid routing sensor traces parallel to noisy signals such as switching power lines or motor phases.
Do not exceed 3.6 V on VDD - the CAP1126-1-AP-TR is a 3.3 V part and over-voltage will damage the device. Confirm the I2C pull-up resistors are sized correctly for the bus capacitance (typically 4.7 kohm at 3.3 V / 400 kHz). Ensure the exposed thermal pad is soldered to a grounded copper pour for mechanical reliability and EMI performance. When using proximity detection, calibrate sensitivity on the final mechanical assembly, since proximity range is highly dependent on overlay material thickness and dielectric constant.
Route the I2C SDA and SCL traces as a differential pair with a ground reference and keep their length under 50 mm to avoid ringing at 400 kHz. Place a 100 ohm series termination resistor near the host MCU side if bus capacitance exceeds 100 pF. The INT pin is open-drain and requires a pull-up (typically 10 kohm to VDD); keep the INT trace short and away from switching power nodes. For multi-device designs, ensure each CAP1126 variant address (0x28 / 0x29 / 0x2A) is unique on the bus.
The CAP1126-1-AP-TR draws approximately 500 uA of active supply current, but peak current during sensor scans can reach 1 mA. Provide a low-impedance 3.3 V rail with at least 10 mA of headroom to avoid supply droop during scanning, which can otherwise be interpreted as a touch event. Decouple with a 1 uF X7R plus a 0.1 uF X7R capacitor in parallel close to the VDD pin.
Informations de conformité
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; for automotive safety applications consult Microchip's automotive-grade touch-sensor portfolio. REACH compliance stated per Microchip environmental policy.
