AD7142
PRODUCTIONProgrammable Controller for Capacitance Touch Sensors
- Part Models
- 4
- 1ku List Price
- Starting From $1.66
Part Details
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The AD7142 and AD7142-1 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or wheels.
The CDC has 14 inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) capacitance-to-digital converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. High resolution sensors require minor software to run on the host processor.
The AD7142 and AD7142-1 have on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, when the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment.
The AD7142 has an SPI-compatible serial interface, and the AD7142-1 has an I2C-compatible serial interface. Both parts have an interrupt output, as well as a general-purpose input/ output (GPIO).
The AD7142 and AD7142-1 are available in a 32-lead, 5 mm × 5 mm LFCSP_VQ and operate from a 2.6 V to 3.6 V supply. The operating current consumption is less than 1 mA, falling to 50 μA in low power mode (conversion interval of 400 ms).
Applications
- Personal music and multimedia players
- Cell phones
- Digital still cameras
- Smart hand-held devices
- Television, A/V, and remote controls
- Gaming consoles
Documentation
Data Sheet 1
Application Note 9
Technical Articles 3
Product Highlight 1
Frequently Asked Question 1
Device Drivers 1
Product Highlight 1
Rarely Asked Question Page 2
Analog Dialogue 1
Webcast 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7142ACPZ-1500RL7 | 32-Lead LFCSP (5mm x 5mm w/ EP) | ||
| AD7142ACPZ-1REEL | 32-Lead LFCSP (5mm x 5mm w/ EP) | ||
| AD7142ACPZ-500RL7 | 32-Lead LFCSP (5mm x 5mm w/ EP) | ||
| AD7142ACPZ-REEL | 32-Lead LFCSP (5mm x 5mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
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Jul 5, 2022 - 21_0271 Qualification of an Alternate Adhesive Material and Molding Compound for Select LFCSP Packages |
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| AD7142ACPZ-1500RL7 | PRODUCTION | |
| AD7142ACPZ-1REEL | PRODUCTION | |
| AD7142ACPZ-500RL7 | PRODUCTION | |
| AD7142ACPZ-REEL | PRODUCTION | |
|
Nov 10, 2014 - 14_0047 Conversion of 5x5mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines. |
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| AD7142ACPZ-1500RL7 | PRODUCTION | |
| AD7142ACPZ-1REEL | PRODUCTION | |
| AD7142ACPZ-500RL7 | PRODUCTION | |
| AD7142ACPZ-REEL | PRODUCTION | |
|
Oct 26, 2009 - 09_0202 Inclusion of Banding Tape for LFCSP REEL7 parts. |
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| AD7142ACPZ-1500RL7 | PRODUCTION | |
| AD7142ACPZ-500RL7 | PRODUCTION | |
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Feb 15, 2010 - 07_0061 LFCSP Package Manufacturing Line Transfer from Amkor Korea to Amkor PRC |
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| AD7142ACPZ-REEL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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