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TMP92CZ26A
92CZ26A-564
3.20 Touch Screen Interface (TSI)
The TMP92CZ26A has an interface for 4-terminal resistor network touch-screen.
This interface supports two procedures: an X/Y position measurement and touch detection.
Each procedure is performed by setting the TSI control register (TSICR0 and TSICR1) and
using an internal AD converter.
3.20.1 Touch-Screen Interface Module Internal/External Connection
Figure 3.20.1External connection of TSI
Figure 3.20.2 Internal block diagram of TSI
External Capacitors
MY
MX
PY
PX
TMP92CZ26A
Y-
Y+
Touch
Screen
X-
X+
A
VSS
P96/INT4
(PX)
P97
(PY)
VREFH
VREFL
PXEN
PYEN
MXEN
MYEN
A
N3
A
N2
PG3/AN3
(MY)
A
VCC
PG2/AN2
(MX)
VREFH
VREFL
A
VCC
A
VSS
A
D converte
r
Touch screen control
TSI7
SP
Y
SPX
SMX
SMY
PXD (typ.50kΩ)
Dec.
INT4
PTST
Internal data bus
INT4