QT112-IS Atmel, QT112-IS Datasheet - Page 3

• Manufacturer Part Number: QT112-IS
• Description: SENSOR IC TOUCH/PROXMTY 1CH8SOIC
• Manufacturer: Atmel
• Series: QProx™r
• Type: Capacitiver

Specifications of QT112-IS

• Rohs Status: RoHS non-compliant
• Touch Panel Interface: 1, 2-Wire
• Number Of Inputs/keys: 1 Key
• Resolution (bits): 14 b
• Data Interface: Serial
• Voltage Reference: Internal
• Voltage - Supply: 2.45 V ~ 5.25 V
• Current - Supply: 60µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Output Type: Logic
• Interface: 2-Wire
• Input Type: Logic
• Package / Case: -
• Other names: 427-1008

QT112-I / QT112H-I QProx™ 8-pin Sensor
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.
This part is only available in -I suffix (-40..+85C)
Description
The QT112 is a variant of the QT110 having a faster response time of 49ms worst case, and 25ms typical. It is
designed for those touch sensing applications where faster speed is paramount, for example in games and toys
where rapid reaction time is critical, or in machine tool controls where speed is important. It trades off power
consumption for speed. Also, note that the device has a consensus filter count 2 instead of 4, and does not have
an acoustic driver for a piezo 'beeper'.
Differences with the QT110
The QT112 sensor is exactly the same in all respects to the QT110 with the following exceptions (refer to Tables
4.3, 4.4, and 4.5 in the QT110 datasheet):
4.3 AC SPECIFICATIONS
4.4 SIGNAL PROCESSING
4.5 DC SPECIFICATIONS
Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted
Piezo Driver Note:
beeper would interfere with the sensing interval and slow down the device.
QT112H Version
The QT112H version is the same as the QT112 except with an active-high output.
All other operating modes, specifications, and wiring should be taken from the QT110 data sheet.
Package Marking - QT112-I
DIP Package: DIP devices are marked 'QT112'
SO8 Package: Marked 'QT1 2I'
Package Marking - QT112H-I
DIP Package: DIP devices are marked 'QT112H'
SO8 Package: Marked 'QT1 M'
QT112 QProx™ 8-pin Sensor
Description
Consensus filter length
Positive drift compensation rate
Negative drift compensation rate
Parameter
Parameter
I
DD
T
T
BS
R
Supply current
Burst spacing interval
Response time
Description
Description
The piezo acoustic driver has been removed, as the duration required to operate the
Vdd = 3.0, Ta = recommended operating range
Min
Min
Typ
60
Min
Typ
24
49
1,250
Max
Typ
24
2
Max
Max
Units
µA
Units
ms
ms
samples
ms/level
ms/level
Units
Notes
© 1999 QRG Ltd.
Notes
Notes