AT42QT1111-MU Atmel, AT42QT1111-MU Datasheet - Page 15

• 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

4.1.5.2
9571A–AT42–02/10
Get Instructions
Get instructions are instructions that read the data from a location in the QT1111 memory map.
Figure 4-7.
The host sends the appropriate “Get” command, followed by a “Null” byte. The QT1111 returns
the contents of the addressed memory location.
Figure 4-7 on page 15
(assuming that the data byte is 0x0C).
With CRC Enabled, this exchange takes 4 bytes, with a command CRC transmitted by the host
and a report CRC returned by the QT1111 (see
Figure 4-8.
Host (Sends on MOSI)
Host (Sends on MOSI)
Positive Recalibration Delay Get Instruction – CRC Disabled
Positive Recalibration Delay Get Instruction – CRC Enabled
“Get” Data: 0x0C (Positive Recalibration Delay)
“Get” Data: 0x0C (Positive Recalibration Delay)
shows the exchange for a report on the positive recalibration delay
Response: 0x68 (Expected Command CRC)
Response: 0x55 ( Idle”
Response: 0x55 ( Idle”
AT42QT1111-MU/AT42QT1111-AU
Command CRC: 0x68
“Get” CRC: 0xA3
Command: 0xD5
Command: 0xD5
Null: 0x00
Null: 0x00
Null: 0x00
“
“
–
–
Figure
Fresh Command)
Fresh Command)
4-8).
Device (Responds on MISO)
Device (Responds on MISO)
Simultaneous
Transmission
Simultaneous
Transmission
15