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ML51/ML54/ML56
Sep. 01, 2020
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ML51/M
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L56
Series
Tec
hnical Reference
Manual
6.19.4 Block Diagram
The block diagram of Touch Key controller is depicted as following:
Analog
Mux
Matrix
TK14
TK13
TK12
TK11
TK10
TK9
TK8
TK7
TK6
TK5
TK4
TK3
TK2
TK1
TK0
CMP
+
_
TK_CTL
INT
CPU
Interface
RTC Tick
Reference
Reference
Touch Key 1
Touch Key 1
Shielding
Shielding
Touch Key 2
Touch Key 2
Touch Key n
Touch Key n
Capacitor Bank
Polarity Select
Capacitor Bank
Polarity Select
TKx Polarity
Select
TKx Control
Note:
All TK pin can be assigned as External Reference, Shielding or Touch Key function. All TK signal through Analog Mux Matrix send to
internal control logic
counter
CB
CCB
Complement
Capacitor Bank
for Touch Key
Capacitor Bank
for Reference
Figure 6.19-1Touch Key block diagram