AT42QT2120-XUR
Analog and Digital Output
Technical Specifications
| Type | Description |
|---|---|
| Features | Proximity detection;Sliding touch;Capacitive Touch;Automatic sensitivity calibration;Waterproof anti-interference touch |
| Operating Temp | -40°C ~ +85°C |
| Channels | 12.0 |
| Working Voltage V | 3.65 V |
| Type | Description |
|---|---|
| ESD Protection Voltage | - |
| Whether the Lock | No |
| Package / Case | TSSOP-20 |
Product Introduction
The AT42QT2120 (QT2120) is a QTouchADC sensor driver. The device can sense from one to 12 keys, dependent on mode. Three of the keys can be used as sense channels for a slider or wheel, leaving a maximum of nine standard touch keys. The device also supports the use of proximity sensors and a guard channel.
The QT2120 includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced. Only a few external parts are required for operation and no external Cs capacitors are required.
The QT2120 modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise, and to suppress RF emissions. The QT2120 uses a QTouchADC method of acquisition. This provides greater noise immunity and eliminates the need for external sampling capacitors, allowing touch sensing using a single pin.
The QT2120 can operate in two ways; comms and standalone.
Features
- Number of Keys:
- Comms Mode: 1 to 12 keys (1 to 9 if wheel or slider option enabled)
- Standalone Mode: 1 to 5 keys
- Technology:
- Patented spread-spectrum QTouchADC charge-transfer
- Number of Output Lines:
- Comms Mode: Up to 10 channels can be configured as outputs (but they will replace the keys)
- Standalone Mode: 1 to 5 channels can be configured as outputs
- Key Outline Sizes:
- 5 mm x 5 mm or larger (panel thickness dependent)
- Key Spacings:
- 6 mm or wider, center to center (panel thickness, human factors dependent)
- Key Design:
- Single solid or ring shaped electrodes; widely different sizes and shapes possible
- Proximity Electrode Design:
- Single solid electrodes; Key Design, Loop, PCB Trace - different sizes and shapes possible
- Wheel Size:
- Typically 30 mm - 50 mm diameter
- Wheel Electrode Design:
- Spatially interpolated wheel up to 80 mm diameter
- Typical width of segments 12 mm
- Slider Electrode Design:
- Spatially interpolated, resistorless design
- Typical length 50 mm - 100 mm, typical width 12 mm
- Can be an arc or other irregular shape
- Substrates:
- FR-4, low cost CEM-1 or FR-2 PCB materials; polyamide FPCB; PET films, glass
- Adjacent Metal:
- Compatible with grounded metal immediately next to keys
- Layers Required:
- One; electrodes and components can be on same side
- Electrode Materials:
- Etched copper, silver, carbon, indium tin oxide (ITO), PEDOT
- Panel Materials:
- Plastic, glass, composites, painted surfaces (nonconductive paints)
- Key Panel Thickness:
- Up to 15 mm glass (key size dependent)
- Up to 10 mm plastic (key size dependent)
- Wheel/slider Panel Thickness:
- Up to 4 mm glass
- Up to 3 mm plastic
- Key Sensitivity:
- Comms Mode – individually settable via simple commands over I²C interface
- Standalone mode – settings are fixed
- Interface:
- I²C slave mode (400 kHz)
- CHANGE status indication pin
- Signal Processing:
- Self-calibration, Auto drift compensation, Noise filtering, Adjacent Key Suppression (AKS)
- Power:
- 1.8 V to 5.5 V
- Packages:
- 20-pin SOIC/TSSOP RoHS compliant IC
- 20-pad VQFN RoHS compliant IC
Datasheet
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 9031809090 |
| USHTS | 9031808070 |
| TARIC | 9031808000 |
| Type | Details |
|---|---|
| CAHTS | 9031800090 |
| BRHTS | 90318099 |
| INHTS | 90318000 |
| MXHTS | 9031.80.99 |
Sourcing Information
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