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NOTE
This table doesn't apply to noise mode, see noise mode sections
for its configuration.
Table 21-12. Delta voltage configuration
DVOLT
V
p
(V)
V
m
(V)
Δ
V (V)
00
1.33
0.30
1.03
01
1.18
0.45
0.73
10
1.03
0.60
0.43
11
0.95
0.67
0.29
21.4.8 Current source
The TSI module supports eight different current source power to increment from 500 nA
to 64 µA. TSI_CS2[EXTCHRG] determines the current of electrode oscillator that
charges and discharges external electrodes. The TSI_CS2[REFCHRG] determines the
current of reference oscillator on which the internal reference clock depends. The lower
current source takes more time for charge and discharge, which is useful to detect high-
accuracy change. The higher current source takes less time, which can be used to charge
a big electrode by less power consumption.
TSI_CS0[CURSW] allows the current source to swap, so that the reference oscillator and
electrode oscillator use the opposite current sources. When TSI_CS0[CURSW] is set and
the current sources are swapped, TSI_CS2[EXTCHRG] and TSI_CS2[REFCHRG] still
control the corresponding current sources, that is, TSI_CS2[EXTCHRG] controls the
reference oscillator current and TSI_CS2[REFCHRG] controls the electrode oscillator
current.
21.4.9 Pin enable
The TSI module supports up to 16 electrodes. Each active electrode must be enabled on
external pinout before scanning by setting the associated TSI_PENx[PENx] bit.
Otherwise, the scan does not work or an invalid result will be asserted. Remember to
select the channel number by the TSI_CS3[TSICH] before trigger TSI to work.
Chapter 21 Touch Sense Input (TSI)
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
595
Содержание MC9S08PT60
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