QT1106-ISG Просмотр технического описания (PDF) - Quantum Research Group
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QT1106-ISG Datasheet PDF : 20 Pages
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Figure 2.1 Connection Diagram (32-QFN Package)
Vunreg
4.7uF
+2.8 ~ +5V
Voltage Reg
4.7uF
KEY 3
KEY 2
KEY 1
RSNSB4 4.7nF C
10K
RSNSB3 4.7nF
C Sb3
10K
RSNSB2 4.7nF
C Sb2
10K
RSNSB1 4.7nF
C Sb1
10K
The wheel shows positions
at 7-bit resolution. See the
table at the end of
Section 3.5.2 for other
resolutions.
RSNSA3 15nF
10K
127 0
C Sa3
100nF
VDD
3
2
Note: One bypass capacitor to be
tightly wired between Vdd and Vss.
Follow recommendations from regulator
manufacturer for input and output
capacitors.
VDD
14 SNSB4
13
SNSB
15
SNSB3
SNSB
16 SNSB2
19
SNSB
/RST
12
SNSB
7
SNSB7
11
SNSB
8
SNSB6
10
SNSB
9
SNSB5
4.7nF
RSNSB7
CSb7 10K
4.7nF
RSNSB6
CSb6 10K
4.7nF
RSNSB5
CSb5 10K
KEY 7
KEY 6
KEY 5
17 SNSB1
18
SNSB
32 SNSA3
27
SNSA
QT1106
32-QFN
N.C. 5
OSC 4
VDD
**Rb1
**Rb2
**See the table below for
suggested resistor and capacitor
values, with and without spread
spectrum.
No Spread-spectrum:
Replace Css with 100K resistor and remove Rb2
R SNSA1 15nF
85
43
CSa1
10K
RSNSA2
15nF
C Sa2
10K
CHANGE out
30
SNSA1
29
SNSA
31 SNSA2
28
SNSA
6 CHANGE
SPREAD 1
DRDY 21
SCLK 23
MISO 26
MOSI 25
/SS 24
*Css
100K
SPI DRDY out
SPI SCLK in
SPI MISO out
SPI MOSI in
SPI /SS in
100K
NOTE: Sense terminals can be twinned with any
e.g. SNSA1 can be paired with any SNSA terminal.
VSS
22
SNSA pins: 27 ,28, 29
SNSB pins: 10, 11, 12, 13, 18, 19, 20
IMPORTANT DESIGN GUIDELINES:
# 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:
Vdd Range
<3V
3.0~3.6V
> 3.6V
With Spread Spectrum
Rb1
Rb2
Css
12k
27k
12k
22k
see note
below
15k
27k
Without Spread Spectrum
Rb1
Rb2
Css
15k
replace with
18k
not fitted
100k
20k
resistor
# The required value of the spread-spectrum capacitor (Css) will vary according to the lengths of the acquire bursts . A
typical value is 100nF.
# 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 13.
Lq
7
QT1106-ISG R8I.05/0906
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