Figure 1.1 Connection Diagram - Full Options
Vunreg
*4.7uF
+2.8 ~ +5V
Voltage Reg
*4.7uF
*100nF
VDD
* Note: one bypass capacitor to be tightly wired
between Vdd and Vss. Follow manufacturer’s
recommendations for input and output capacitors.
Keep these parts
close to the IC
MOD_1
Vdd / Vss
R
SNS3
KEY 3
10K
POL
Vdd / Vss
R
SNS4
KEY 4
10K
OUT_D
Vdd / Vss
1M
16
1M
12
3
2
Keep these parts
close to the IC
KEY 2
SNS3
SNS3K
VDD
1nF C
S3
13
/RST SNS2K
11
1nF
C
S2
R
SNS2
10K
SNS2
10
SNS1K
9
1nF
1M
MOD_0
Vdd / Vss
1M
14
SNS4
SNS1
SNS4K
1nF C
S4
15
8
SNS0K
7
SNS5
SNS5K
SNS0
6
1nF
R
SNS5
KEY 5
10K
SL_0
Vdd / Vss
R
SNS6
KEY 6
10K
SL_1
Vdd / Vss
R
SNS7
KEY 7
10K
1M
20
C
S1
R
SNS1
10K
1M
AKS_1
Vdd / Vss
1nF
C
S0
R
SNS0
10K
1M
AKS_0
Vdd / Vss
VDD
KEY 1
KEY 0
Recommended Rb1, Rb2 Values
1M
18
Rb1
SNS6
1nF
19
QT1081
SNS6K
32-QFN
SNS7
SNS7K
OSC
4
Rb2
SS
1
OUT_7
32
OUT_6
31
Vdd Range Rb1 Rb2
2.8 ~ 3.59V 12K
22K
3.6 ~ 5V
15K
27K
The required value of spread-spectrum capacitor CSS
will vary according to the lengths of the acquire bursts,
see Section 3.2. A typical value of CSS is 100nF.
C
SS
1nF C
S7
21
OUT_7
OUT_6
OUT_5
OUT_4
OUT_3
OUT_2
OUT_1
OUT_0
Binary coded
output mode
OUT_5
30
OUT_4
29
22
VSS
SYNC/LP
DETECT
OUT_3
28
SYNC or LP IN
23
OUT_2
27
OUT_1
26
OUT_0
25
DETECT OUT
24
Table 1.2
AKS / Fast-Detect Options
AKS_1
Vss
Vss
Vdd
Vdd
MOD_1
Vss
Vss
Vdd
Vdd
OUT_D
Vss
Vss
Vdd
Vdd
SL_1
Vss
Vss
Vdd
Vdd
AKS_0
Vss
Vdd
Vss
Vdd
MOD_0
Vss
Vdd
Vss
Vdd
POL
Vss
Vdd
Vss
Vdd
SL_0
Vss
Vdd
Vss
Vdd
AKS MODE
Off
Off
On, in 2 groups
On, global
FAST-DETECT
Off
Enabled
Off
Off
Table 1.3
Max On-Duration
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
One-per-key, active low, open-drain
One-per-key, active high, push-pull
One-per-key, active low, push-pull
SYNC/LP PIN MODE
Sync
LP mode: 100ms nom response time
LP mode: 180ms nom response time
LP mode: 340ms nom response time
Table 1.4
Polarity and Output
Table 1.5
SYNC/LP Function
lQ
6
QT1081_1R0.04_0307
QUANTUM [ QUANTUM RESEARCH GROUP ]
