AT42QT1040-MMH Atmel, AT42QT1040-MMH Datasheet - Page 11

• Manufacturer Part Number: AT42QT1040-MMH
• Description: IC TOUCH SENSOR 4KEY 20-VQFN
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Resistiver

Specifications of AT42QT1040-MMH

• Touch Panel Interface: 4, 2-Wire
• Number Of Inputs/keys: 4 Key
• Data Interface: I²C, Serial
• Data Rate/sampling Rate (sps, Bps): 200k
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Current - Supply: 10mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Output Type: Logic
• Input Type: Logic
• Supply Voltage: 1.8 V to 5.5 V
• Dimensions: 3 mm L x 3 mm W x 0.8 mm H
• Output Voltage: 0.7 V to 0.8 V
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: AT42QT1040-MMH; AT42QT1040-MMHTR

9524B–AT42–04/09
Table 4-3.
Table 4-4.
Bit 7:
Bits 4 – 6:
Bits 0 – 3:
Figure 4-2
monitored and tweaked to the specific application with great accuracy.
Figure 4-2.
Bit 7
CAL
Byte
to
18
19
20
21
22
23
24
25
26
27
28
29
Figure 4-5
This bit is set during calibration
Contains the number of keys active
Show the touch status of the corresponding keys
Serial Data Output (Continued)
Status Byte (Byte 28)
Byte Clocked Out (~5 µs Period)
Bit 6
Number of Keys (2-4)
show the usefulness of the debug data out feature. Channels can be
Bit 5
Purpose
Delta 0 Low Byte
Delta 0 High Byte
Delta 1 Low Byte
Delta 1 High Byte
Delta 2 Low Byte
Delta 2 High Byte
Delta 3 Low Byte
Delta 3 High Byte
Flags
Flags2
Status Byte
Frame Number
Bit 4
Key 3
Bit 3
Unsigned byte. See
Notes
Signed 16-bit integer
Signed 16-bit integer
Signed 16-bit integer
Signed 16-bit integer
Various operational flags
Unsigned bytes
Repeat of framing index number in
byte 0
Key 2
Bit 2
AT42QT1040
Key 1
Bit 1
Table 4-4
Key 0
Bit 0
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