QT1106-ISG Atmel, QT1106-ISG Datasheet - Page 7

• Manufacturer Part Number: QT1106-ISG
• Description: QT1106 WHEEL/SLIDER CHIP W/7KEYS
• Manufacturer: Atmel
• Series: QSlide™, QTouch™, QWheel™r
• Type: Capacitiver

Specifications of QT1106-ISG

• Touch Panel Interface: 5-Wire
• Number Of Inputs/keys: 7 Slider
• Resolution (bits): 14 b
• Data Interface: Serial, SPI™
• Voltage Reference: External
• Voltage - Supply: 2.8 V ~ 5 V
• Current - Supply: 1.3mA ~ 3.6mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Output Type: Logic
• Interface: SPI
• Input Type: Logic
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 427-1115-2

IMPORTANT DESIGN GUIDELINES:
Lq
•
•
•
•
•
The wheel shows positions at
7-bit resolution. See the table
at the end of Section 3.5.2 for
other resolutions.
The sensitivities of the various sense channels are determined by the values of the respective Cs capacitors (i.e. Csb1,
Csb7, etc.); these values will require adjustment based on building a prototype product and testing the sensitivity
experimentally.
Rb1, Rb2 sets the oscillator frequency; recommended values are:
The required value of the spread-spectrum capacitor (Css) will vary according to the lengths of the acquire bursts. A
typical value is 100nF-220nF.
When the QT1106 is running the OSC pin has a DC voltage typically between 1V and 1.5V; the use of spread
spectrum will cause a small low-frequency variation in the voltage. The internal oscillator signal is not visible on this
pin.
Signals DRDY and CHANGE may need pull-down resistors, see Section 5 on page 14.
Vdd Range
KEY 3
KEY 2
KEY 1
3.0~3.6V
> 3.6V
< 3 V
CHANGE out
NOTE:
Vunreg
Sense terminals can be twinned with any
e.g. SNSA1 can be paired with any SNSA terminal.
SNSA pins: 27 ,28, 29
SNSB pins: 10, 11, 12, 13, 18, 19, 20
85
127 0
4.7uF
43
Rb1
12k
12k
15k
Figure 2.1 Connection Diagram (32-QFN Package)
With Spread Spectrum
Voltage Reg
R
R
R
R
Keep these parts
R
R
R
100K
close to the IC
SNSA1
SNSA2
SNSB4
SNSB3
SNSB2
SNSB1
SNSA3
Rb2
27k
22k
27k
C
C
4.7uF
C
C
C
C
C
Sa1
Sa2
Sb4
Sb3
Sb2
Sb1
Sa3
14
13
15
16
19
18
32
27
30
29
28
17
31
6
100nF
SNSA
SNSB4
SNSB
SNSB3
SNSB
SNSB2
SNSB
SNSB1
SNSB
SNSA3
SNSA
SNSA1
SNSA2
SNSA
CHANGE
see note
7
below
Css
VDD
3
32-QFN
QT1106
22
VSS
VDD
/RST
2
SPREAD
Note: One bypass capacitor to be
tightly wired between Vdd and Vss.
Follow recommendations from regulator
manufacturer for input and output
capacitors.
SNSB7
SNSB6
SNSB5
DRDY
SNSB
SCLK
MISO
SNSB
MOSI
SNSB
OSC
N.C.
/SS
Rb1
15k
18k
20k
10
23
26
25
24
12
11
21
Without Spread Spectrum
7
8
9
5
4
1
C
C
C
**Rb1
**Rb2
Sb7
Sb6
Sb5
Keep these parts
close to the IC
VDD
not fitted
Rb2
**
suggested resistor and capacitor
values, with and without spread
spectrum.
No Spread-spectrum:
*
Css
See the table below for
Replace Css with 100k resistor and remove Rb2
100k
R
R
R
QT1106_8IR0.07_0907
SNSB6
SNSB7
SNSB5
100k resistor
replace with
Css
SPI DRDY out
SPI SCLK in
SPI MISO out
SPI MOSI in
SPI /SS in
KEY 7
KEY 6
KEY 5