AT42QT1111-MU Atmel, AT42QT1111-MU Datasheet - Page 24

• 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

6. Report Requests
6.1
6.2
24
Introduction
First Key (0xC0)
AT42QT1111-MU/AT42QT1111-AU
The host can request reports from the QT1111, as summarized in
Table 6-1.
Note that SPI communications are full-duplex, so the host must transmit on the MOSI pin to
keep the communications active, while reading data from the QT1111 on the MOSI pin. Failure
to do this within 100 ms will cause the device to assume that the exchange has been abandoned
and reset the SPI interface. The host should therefore send one or two “NULL” bytes, as
appropriate, on the MOSI line as it receives the 1- or 2-byte report data from the device.
This command returns 1-byte report in the format shown in
Table 6-2.
DETECT: 0 = no key in detect; 1 = there is a key in detect.
NUMKEY: indicates the number of keys in detect:
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.
Command
Send First Key
Send All keys
Device Status
EEPROM CRC
RAM CRC
Error Keys
Signal for Key “k”'
Reference for Key “k”
Status for Key “k”
Detect Output States
Last Command
Setups
Device ID
Firmware Version
Byte 0
0 = only one key is in detect (specified by “KEY_NUM”)
1 = more than one key in detect.
DETECT
Bit 7
Report Requests
Send First Key Report Format
NUMKEY
Bit 6
Code
0xCA
0xC0
0xC1
0xC2
0xC3
0xC4
0xC5
0xC6
0xC7
0xC8
0xC9
0x2k
0x4k
0x8k
ERROR
Bit 5
Note
Returns the first detected key
Returns all keys
Returns the device status
Returns the EEPROM CRC
Returns the RAM CRC
Returns the error keys
Returns the signal for key “k”
Returns the reference for key “k”
Returns error conditions/touch indication
Returns the detect output states
Returns the last command sent to QT1111
Returns the setup data
Returns the device ID
Returns the firmware version
Bit 4
Bit 3
Table
6-2.
Table
Bit 2
KEY_NUM
6-1.
Bit 1
2-byte number
2-byte number
Data Returned
2-byte bitfield
1-byte bitfield
2-byte bitfield
9571A–AT42–02/10
42 bytes
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
Bit 0