AT42QT1111-MU Atmel, AT42QT1111-MU Datasheet - Page 34

• 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

7.13
34
Address 16: LED Detect Hold Time
AT42QT1111-MU/AT42QT1111-AU
OUT_DETECTn: PWM to output when key n is “Out of Detect” (where n is 0–7). This PWM is
also output if the DETECT output is “disconnected” from the key (that is, “LED_n” in address 17
is set to 0), allowing the host to directly control the PWM output.
The values for the “IN_DETECTn” and “OUT_DETECTn” nibbles are listed in
Table 7-12.
Default IN_DETECTn value:
Default OUT_DETECTn value:
Table 7-13.
When a key is touched, if the “Detect” outputs and “Key to LED” options are enabled (see
Section 7.12
signal.
After the key touch is removed, the “Detect” output can be held at the “In-Detect” PWM signal for
a time before returning to the “Out of Detect” PWM signal. This allows a reasonable length of
time for an LED to be illuminated. The length of this time is controlled by the LED Detect Hold
Time. Valid values are in multiples of 16 ms.
Default value:
Address
16
Value
0
1
2
3
4
5
6
7
8
and
Bit 7
PWM Values
LED Detect Hold Time
Section
Bit 6
7.14), the corresponding “Detect” pin will output its “In-Detect” PWM
Meaning
12.5%
37.5%
62.5%
87.5%
100%
25%
50%
75%
0 (0 ms)
0%
Bit 5
8 (100% PWM – on)
0 (0% PWM – off)
LED_DETECT_HOLD_TIME
Bit 4
Bit 3
Bit 2
Table
Bit 1
9571A–AT42–02/10
7-12.
Bit 0