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AT42QT1110-AU Datasheet(PDF) 25 Page - ATMEL Corporation |
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AT42QT1110-AU Datasheet(HTML) 25 Page - ATMEL Corporation |
25 / 50 page ![]() 25 AT42QT1110-MU / AT42QT1110-AU [DATASHEET] 9520J–AT42–05/2013 ERROR: 0 = there are no keys in an error state; 1 = at least one key is in error state. KEY_NUM: the key number (0 to 10) of the key in detect (if there is only one), or the number of the first key to go into detection when there are more than one. 6.3 All Keys (0xC1) Returns a 2-byte bit-field report indicating the detection status of all 11 keys. KEY_n: 0 = key n out of detect, 1 = key n in detect (where n is 0 – 10). 6.4 Device Status (0xC2) This command returns a 1-byte bit-field report indicating the overall status of the QT1110. Bits 7 is always 1; the other bits are as follows: DETECT: 0 = no key in detect, 1 = at least 1 key in detect. CYCLE: 0 = cycle time is good, 1 = cycle time over-run. A cycle time over-run occurs when it takes longer to measure and process all the keys than the assigned cycle time. ERROR: 0 = no key in error state, 1 = at least 1 key in error. CHANGE: 0 = CHANGE pin is asserted, 1 = CHANGE pin is floating. EEPROM: 0 = EEPROM is good, 1 = EEPROM has an error. If there are no settings stored in EEPROM, the EEPROM error bit is set and a zero EEPROM CRC is returned. RESET: set to 1 after power-on or reset, cleared when “Device Status” is read. GUARD: 0 = guard channel is not in detect, 1 = guard channel is active or in detect. This bit will be zero if the guard channel is not enabled. 6.5 EEPROM CRC (0xC3) This command returns a 1-byte CRC checksum for the setup data in EEPROM. 6.6 RAM CRC (0xC4) This command returns a 1-byte CRC checksum for the setup data in RAM. Table 6-3. Send All Keys Report Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 0 KEY_10 KEY_9 KEY_8 Byte 1 KEY_7 KEY_6 KEY_5 KEY_4 KEY_3 KEY_2 KEY_1 KEY_0 Table 6-4. Device Status Report Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 0 1 DETECT CYCLE ERROR CHANGE EEPROM RESET GUARD |
Similar Part No. - AT42QT1110-AU_14 |
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