ML51/ML54/ML56
Sep. 01, 2020
Page
671
of 719
Rev 2.00
ML
51
/ML
54
/ML
5
6 S
E
RI
E
S
TECHNI
CA
L
RE
F
E
R
E
NC
E
M
A
NU
A
L
ML51/M
L54
/M
L56
Series
Tec
hnical Reference
Manual
C
F
+
_
CB
CCB
CMPX_IN
CMPX_IP
Complement
Capacitor Bank
for Touch Key
Capacitor Bank
for Reference
C
R
Reference Pad
Reference Pad
Touch Key
Touch Key
CMP
Capacitor Bank
Polarity Select
counter
C
T
C
P
CMPX_IN ( C
T
)
CMPX_IP ( C
R
)
Touch Key Scan
Enabled Cycle
Capacitor Bank Polarity
AVSS
Voltage
Touch key controller will
increase C
CB
to C
CB
’
Original C
CB
CMPX_IN ( C
T
)
CMPX_IP ( C
R
)
Time
Increase C
CB
to C
CB
’
Touch Key Scan
Enabled Cycle
Figure 6.19-3 Finger Touch Detection Method