UR7HCTS2-S840 Datasheet, PDF (3/16 Pages) Semtech Corporation – High-Performance, Low Power Touch Screen Controller/Digitizer

PIN DEFINITIONS
Mnemonic
VDD
VSS
VSS2
OSCIN
Pin #
8
11
7
9
_OSCOUT
10
_RESET
6
XCLK
17
XDAT
18
_LB
24
_RB
25
XR1, XR2 12, 23
YB1, YB2 13, 22
YT1, YT1 14, 21
XL1, XL2 15, 20
VREF
5
SXL
31
SYT
32
SYB
1
SXR
2
_PWR_DOWN 30
XPWRS
3
_SS/_RTS
_ATN/_CTS
TXD
SCLK/ISEL
SOUT
RSVD1-2
16
4
27
28
29
19,26
Type
P
P
P
I
O
I
I/O (nd)
I/O (nd)
I/O (nd)
I/O (nd)
I/O
I/O
I/O
I/O
AI
AI
AI
AI
AI
I
AI
I
O
O
I
I/O
I/O
Name and Function
Power Supply
Ground
Ground
Oscillator Input: external clock input or one
side of the Ceramic Resonator with built-in Load
Capacitors
Oscillator Output: open for external clock
input or other side of the Ceramic Resonator with
built-in Load Capacitors
Reset: apply 0V to provide orderly start-up
External Mouse Clock: PS/2 clock signal from
external mouse; keep open if unused
External Mouse Data: PS/2 data signal from
external mouse; keep open if unused
Left Button: active low
Right Button: active low
Sensor’s Excitation Driver: connect to X Right
Sensor’s Excitation Driver:connect toY Bottom
Sensor’s Excitation Driver:connect to Y Top
Sensor’s Excitation Driver: connect to X Left
Reference Voltage for built-in A/D
Sense line: for X Left
Sense line: for Y Top
Sense line: for Y Bottom
Sense line: for X Right
Hardware Power Down: tie high if unused
External Mouse Power Sense: connect to
switched power plane for the external pointing device
or tie high if external mouse port is used; tie low if
external mouse port is unused
Slave Select / Ready To Send: active low, host
ready to get data
Attention / Clear To Send: active low, request
data transfer
Data Output: Serial mode
Interface Select / SPI Clock: tie low for Serial
Data Output: SPI mode
Reserved: Keep open
Note: An underscore before a pin mnemonic denotes an active low signal.
Pin Types Legend: AI=Analog Input; I=Input; O=Output; I/O=Input or Output;
I/O (nd)=Input or Output with N-channel Open Drain driver
Copyright Semtech 2000-2001
3
DOC7-TS2-S840-DS-102
www.semtech.com