Tsc Functional Description; Tsc Block Diagram; Surface Charge Transfer Acquisition Overview; Figure 284. Tsc Block Diagram - STMicroelectronics STM32F05 series Reference Manual

Touch sensing controller (TSC)
27.3

TSC functional description

27.3.1

TSC block diagram

The block diagram of the touch sensing controller is shown in
diagram.

Figure 284. TSC block diagram

f
HCLK
27.3.2

Surface charge transfer acquisition overview

The surface charge transfer acquisition is a proven, robust and efficient way to measure a
capacitance. It uses a minimum number of external components to operate with a single
ended electrode type. This acquisition is designed around an analog I/O group which is
composed of four GPIOs (see
the acquisition of several capacitive sensing channels simultaneously and to support a
larger number of capacitive sensing channels. Within a same analog I/O group, the
acquisition of the capacitive sensing channels is sequential.
One of the GPIOs is dedicated to the sampling capacitor C
I/O per analog I/O group must be enabled at a time.
682/742
Pulse generator
Clock
prescalers
Spread Spectrum
Group counters
TSC_IOG1CR
TSC_IOG2CR
TSC_IOGxCR
Figure
Doc ID 018940 Rev 1
285). Several analog I/O groups are available to allow
S
Figure 284: TSC block
SYNC
G1_IO1
G1_IO2
G1_IO3
G1_IO4
G2_IO1
G2_IO2
I/O Control
G2_IO3
Logic
G2_IO4
Gx_IO1
Gx_IO2
Gx_IO3
Gx_IO4
. Only one sampling capacitor
RM0091