Toshiba H1 Series - Manual (Page 567)

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+
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
Internal d
a
ta
bus
INT4