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QT60240-ISG Datasheet(PDF) 11 Page - Quantum Research Group |
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QT60240-ISG Datasheet(HTML) 11 Page - Quantum Research Group |
11 / 26 page 3.4 CHANGE Pin Pin 2 (CHANGE) is an active-high output that can be used to alert the host to key touches or key releases, thus reducing the need for wasteful I2C communications. Normally, the host can simply not bother to communicate with the device, except when the CHANGE pin goes high. CHANGE becomes active only when there is a change in key state (either touch or touch release); CHANGE goes low again only when the host performs a read from address 1, the detect status register for all keys on Y0. CHANGE does not self-clear; only an I2C read from location 1 will cause it to clear. It is important to read all three key state addresses to ensure the host has a complete picture of which keys have changed. In Shift Register mode the CHANGE pin does not operate and should be left open. Every key can be individually configured to wake a host microcontroller upon a touch change; so, a product can wake from sleep when any key state changes, or only when certain desired keys change state. The configuration is set in the Setups block (Section 6.13) on a key-by-key basis. lQ 11 QT60240-ISG R8.06/0906 Figure 3.2 Shift Register Cycle Key 0 Key 1 Key 2 Key 21 Key 22 Key 23 Key Scan SCL SDA LATCH tSCH tSCL Key 0 Key 3 Key 4 Key 23 tLATCH tSDA-SCL |
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