AT42QT1110-AU Atmel, AT42QT1110-AU Datasheet - Page 25

• Manufacturer Part Number: AT42QT1110-AU
• Description: IC TOUCH SENSOR 11KEY 32TQFP
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Capacitiver

Specifications of AT42QT1110-AU

• Touch Panel Interface: 10, 2-Wire
• Number Of Inputs/keys: 11 Key
• Data Interface: Serial, SPI™
• Voltage Reference: Internal
• Voltage - Supply: 3 V ~ 5.5 V
• Current - Supply: 8mA, 12mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP
• Output Type: Logic
• Interface: SPI
• Input Type: Logic
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT42QT1110-AU; AT42QT1110-AUTR

6.3
6.4
6.5
6.6
9520I–AT42–03/10
All Keys (0xC1)
Device Status (0xC2)
EEPROM CRC (0xC3)
RAM CRC (0xC4)
Returns a 2-byte bit-field report indicating the detection status of all 11 keys.
Table 6-3.
KEY_n: 0 = key n out of detect, 1 = key n in detect (where n is 0–10).
This command returns a 1-byte bit-field report indicating the overall status of the QT1110.
Table 6-4.
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.
This command returns a 1-byte CRC checksum for the setup data in EEPROM.
This command returns a 1-byte CRC checksum for the setup data in RAM.
Byte 0
Byte 1
Byte 0
KEY_7
Bit 7
Bit 7
Send All Keys Report Format
Device Status Report Format
1
DETECT
KEY_6
Bit 6
Bit 6
AT42QT1110-MU/AT42QT1110-AU
CYCLE
KEY_5
Bit 5
Bit 5
ERROR
KEY_4
Bit 4
Bit 4
CHANGE
KEY_3
Bit 3
Bit 3
EEPROM
KEY_10
KEY_2
Bit 2
Bit 2
RESET
KEY_9
KEY_1
Bit 1
Bit 1
GUARD
KEY_8
KEY_0
Bit 0
Bit 0
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