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QT240 - 4 KEY QTOUCH SENSOR IC

Description

Sense pin (to Rs2 + Cs2) Sense pin (to Cs2, electrode) Sense pin (to Rs1 + Cs1) Sense pin (to Cs1, electrode); speed option Output, key 1 Output, key 2 Output, key 3 Ground Sync in and/or spread spectrum drive Unbonded internally Unbonded internally Output, key 4 Reset pin, active low.

Features

  • spread-spectrum acquisition capability, external synchronization of acquire bursts, and fast and slow acquisition modes. These modes are enabled via high-value resistors connected to the SNS pins to ground or Vdd. These resistors are required in every circuit. There are two basic modes as shown in Figures 1-1 and 1-2. Low-power Sync mode: In this mode the device operates with about a 100ms response time and very low current (about 90µA average at 4.0V). This mode allows the device to be synchron.

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Datasheet preview – QT240

Datasheet Details

Part number QT240
Manufacturer QUANTUM
File Size 284.37 KB
Description 4 KEY QTOUCH SENSOR IC
Datasheet download datasheet QT240 Datasheet
Additional preview pages of the QT240 datasheet.

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Full PDF Text Transcription

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www.DataSheet4U.com lQ z Four independent charge-transfer (‘QT’) touch keys z Individual outputs per channel - active high z Projects prox fields through any dielectric z Sensitivity easily adjusted on a per-channel basis z 100% autocal for life - no adjustments required z 3.9V ~ 5.5V single supply operation z 10s, 60s, infinite auto-recal timeout (strap options) z Sync pin for line sync to suppress noise z Spread spectrum operation z Pin options for auto recalibration timings z Extremely low cost per key z 20-SSOP Pb-free package SNS2 SNS2K SNS1 SNS1K OUT1 OUT2 OUT3 VSS SS/SYNC n.c. 1 2 3 4 QT240 5 6 7 8 9 10 20-SSOP 20 19 18 17 16 15 14 13 12 11 QT240 4 KEY QTOUCH™ SENSOR IC SNS3K SNS3 SNS4K SNS4 n.c. OSC VDD /RES OUT4 n.c.
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