TMP92CF30
2009-06-12
92CF30-487
3.19 Touch Screen Interface (TSI)
An interface for 4-terminal resistor network touch-screen is built in.
The TSI easily supports two procedures: touch detection and X/Y position measurement.
Each procedure is performed by setting the TSI control register (TSICR0 and TSICR1) and
using an internal AD converter.
3.19.1 Touch-Screen Interface Module Internal/External Connection
Figure 3.19.1External connection of TSI
Figure 3.19.2 Internal block diagram of TSI
External Capacitors
MY
MX
PY
PX
TMP92CF30
Y-
Y+
Touch
Screen
X-
X+
AVSS
P96/INT4
(PX)
P97
(PY)
VREFH
VREFL
PXEN
PYEN
MXEN
MYEN
AN3
AN2
PG3/AN3
(MY)
AVCC
PG2/AN2
(MX)
VREFH
VREFL
AVCC
AVSS
AD converter
Touch screen control
TSI7
SPY
SPX
SMX
SMY
PXD (typ.50k
Ω
)
Dec.
INT4
PTST
In
te
rn
a
l
da
ta
bus
INT4
Содержание TLCS-900/H1 Series
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