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AT42QT2100 Datasheet(PDF) 25 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 25 Page - ATMEL Corporation |
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25 / 44 page  25 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 5.3 Custom Threshold 5.3.1 Introduction The Custom Threshold command mode (Req = 100) is used to modify the detection threshold of the slider/wheel. It only needs to be sent once, for the new value to take effect, and then the Normal Exchange mode resumes (see Section 5.2 on page 19). The new value will be in use until the chip is reset or a new custom threshold is sent. 5.3.2 Host Data In Custom Threshold command mode the host sends the 3-byte data in Table 5-8. Byte 0 Req – Set to 100 to indicate Custom Threshold command mode. Byte 1 T1: Custom threshold value of the slider/wheel. Higher numbers are less sensitive. Touch detection uses this threshold combined with a hysteresis equal to 25% of the threshold (with a minimum hysteresis value of one). Power-up default setting: 30 Note: Custom Threshold Command is only used if the detection threshold of the slider/wheel needs to be changed from the power-up default. Byte 2 Always set to 0. 5.3.3 QT2100 Data The QT2100 response to the Custom Threshold command is the Normal Exchange report. Once the custom thresholds have been set, the CTL bit in the Normal Exchange report is set to 1 to indicate that the changed threshold has been applied (see Table 5-7). Table 5-8. Custom Threshold Command Mode – Host Command Bytes Host Byte Bit 7 6 5 4 3 2 1 0 0 Req = 100 0 0 0 0 0 1 T1 – Slider/Wheel Threshold 2 0 0 0 0 0 0 0 0 Note: Bits labelled 0 should not be altered |
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