qt1080 Quantum Research Group, qt1080 Datasheet - Page 5

• Manufacturer Part Number: qt1080
• Description: 8 Key Qtouch? Sensor Ic
• Manufacturer: Quantum Research Group

Table 1.2
AKS / Fast-Detect Options
Table 1.3
Max On-Duration
Table 1.4
Polarity and Output
Table 1.5
SYNC/LP Function
lQ
KEY 3
KEY 4
KEY 5
KEY 6
KEY 7
SYNC or LP IN
DETECT OUT
Vunreg
R
R
R
R
R
SNS3
SNS4
SNS5
10K
10K
10K
SNS6
SNS7
10K
10K
4.7nF
4.7nF
4.7nF
4.7nF
4.7nF
Figure 1.1 Connection Diagram - Full Options; Shown for 32-QFN Package
*4.7uF
C
C
C
C
C
S3
S4
S5
S6
S7
2.2K
2.2K
2.2K
2.2K
2.2K
R
R
R
R
R
S7
S3
S4
S5
S6
Voltage Reg
+2.8 ~ +5V
Vdd / Vss
Vdd / Vss
Vdd / Vss
Vdd / Vss
Vdd / Vss
MOD_1
OUT_D
SL_1
POL
SL_0
MOD_1
OUT_D
AKS_1
SL_1
*4.7uF
Vdd
Vdd
Vdd
Vdd
Vdd
Vdd
Vdd
Vdd
Vss
Vss
Vss
Vss
Vss
Vss
Vss
Vss
1M
1M
1M
1M
1M
12
13
15
16
17
18
19
20
21
22
23
24
*100nF
VSS
SNS3
SNS3K
SNS4
SNS4K
SNS5
SNS5K
SNS6
SNS6K
SNS7
SNS7K
SYNC/LP
DETECT
MOD_0
AKS_0
SL_0
POL
VDD
Vss
Vdd
Vss
Vdd
Vss
Vdd
Vss
Vdd
Vss
Vdd
Vss
Vdd
Vss
Vdd
Vss
Vdd
QT1080
32-QFN
VDD
3
/RST
5
AKS MODE
Off
Off
On, in 2 groups
On, global
MAX ON-DURATION MODE
10 seconds (nom) to recalibrate
60 seconds (nom) to recalibrate
Infinite (disabled)
(reserved)
OUT_n, DETECT PIN MODE
Binary coded, active high, push-pull
Direct, active low, open-drain
Direct, active high, push-pull
Direct, active low, push-pull
SYNC/LP PIN MODE
Sync
LP mode: 110ms nom response time
LP mode: 200ms nom response time
LP mode: 360ms nom response time
2
OUT_7
OUT_6
OUT_5
OUT_4
OUT_3
OUT_2
OUT_1
OUT_0
SNS2K
SNS1K
SNS0K
SNS2
SNS1
SNS0
OSC
SS
11
10
9
8
7
6
4
1
32
31
30
29
28
27
26
25
Rb1
Rb2
1M
1M
1M
VDD
FAST-DETECT
Off
Enabled
Off
Off
MOD_0
AKS_1
The required value of spread-spectrum capacitor C
will vary according to the lengths of the acquire bursts,
see Section 3.2. A typical value of C is 100nF.
AKS_0
Recommended Rb1, Rb2 Values
Vdd / Vss
Vdd / Vss
Vdd / Vss
C
SS
Vdd Range
2.8 ~ 3.59V
3.6 ~ 5V
2.2K
2.2K
2.2K
R
R
R
S1
S0
S2
12K
15K
Rb1
4.7nF
4.7nF
4.7nF
QT1080 R11.06/0806
C
C
C
S0
S1
Rb2
S2
22K
27K
OUT_7
OUT_6
OUT_5
OUT_4
OUT_3
OUT_2
OUT_1
OUT_0
OUT_0
R
R
R
10K
10K
10K
SNS1
SNS0
SNS2
SS
KEY 2
KEY 1
KEY 0
SS