Table 134. Acquisition Sequence Summary; Figure 167. Sampling Capacitor Voltage Variation; Reset And Clocks - ST STM32L4x6 Reference Manual

Touch sensing controller (TSC)
State
#1
#2
#3
#4
#5
#6
#7
The voltage variation over the time on the sampling capacitor C
23.3.3

Reset and clocks

The TSC clock source is the AHB clock (HCLK). Two programmable prescalers are used to
generate the pulse generator and the spread spectrum internal clocks:
•
The pulse generator clock (PGCLK) is defined using the PGPSC[2:0] bits of the
TSC_CR register
•
The spread spectrum clock (SSCLK) is defined using the SSPSC bit of the TSC_CR
register
The Reset and Clock Controller (RCC) provides dedicated bits to enable the touch sensing
controller clock and to reset this peripheral. For more information, please refer to
Reset and clock control
694/1693

Table 134. Acquisition sequence summary

G1_IO1 G1_IO2
(electrode) (sampling)
Output open-
Input floating
drain low with
with analog
analog switch
switch closed
closed
Output push-
pull high
Input floating with analog switch
closed

Figure 167. Sampling capacitor voltage variation

(RCC).
DocID024597 Rev 3
G1_IO3
(electrode)
Input floating with analog switch
closed
Input floating
Input floating
Input floating
Input floating
Input floating
Input floating
G1_IO4
State description
(electrode)
Discharge all C
Dead time
Charge C
Dead time
Charge transfer from
C
X1
Dead time
Measure C
is detailed below:
S
RM0351
and
X
C
S
X1
to C
S
voltage
S
Section 6: