AT42QT1111-MU Atmel, AT42QT1111-MU Datasheet - Page 14

• Manufacturer Part Number: AT42QT1111-MU
• Description: IC TOUCH SENSOR 11KEY QFN
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Capacitiver

Specifications of AT42QT1111-MU

• 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: 12mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Output Type: Logic
• Interface: SPI
• Input Type: Logic
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT42QT1111-MU; AT42QT1111-MUTR

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AT42QT1111-MU/AT42QT1111-AU
Figure 4-5.
With CRC Enabled, a CRC byte is also required
transmitted bytes (that is, the “Set” command and the data byte).
For example, for the sequence shown in
the case with the other command types, when the QT1111 is expecting a CRC byte from the
host, it calculates that byte in advance and returns the expected value to the host in the same
transmission as the host sends the CRC byte.
The sent data is not applied to the memory location until the CRC byte has been received and
verified.
Figure 4-6.
Host (Sends on MOSI)
Host (Sends on MOSI)
Positive Recalibration Delay Set Instruction – CRC Disabled
Positive Recalibration Delay Set Instruction – CRC Enabled
Response: 0x55 ( Idle”
Response: 0x95 (Command Just Received)
Response: 0x55 ( Idle”
Response: 0x95 (Command Just Received)
Response: 0x9F (Expected CRC)
Command CRC: 0x9F
Command: 0x95
“Set” Data: 0x0C
Command: 0x95
“Set” Data: 0x0C
Figure 4-5
“
“
–
–
Fresh Command)
Fresh Command)
(Figure
(0x95 — 0x0C), the CRC Byte is 0x9F. As is
Device (Responds on MISO)
Device (Responds on MISO)
4-6). This is calculated for the two
Simultaneous
Transmission
Simultaneous
Transmission
9571A–AT42–02/10