UR7HCTS2-P840 Datasheet, PDF (3/16 Pages) Semtech Corporation – High-Performance, Low Power PS/2 Touch Screen Controller/Digitizer

PIN DEFINITIONS
Mnemonic
VDD
VSS
VSS2
OSCIN
Pin #
8
11
7
9
Type
P
P
P
I
_OSCOUT
10
O
_RESET
HDAT
HCLK
XCLK
XDAT
_LB
_RB
XR1
YB1
YT1
XL1
XL2
YT2
YB2
XR2
VREF
SXL
SYT
SYB
SXR
_POWER_
DOWN
XPWRS
6
I
19
I/O (nd)
16
I/O (nd)
17
I/O (nd)
18
I/O (nd)
24
I/O (nd)
25
I/O (nd)
12
I/O
13
I/O
14
I/O
15
I/O
20
I/O
21
I/O
22
I/O
23
I/O
5
AI
31
AI
32
AI
1
AI
2
AI
30
I
3
AI
RSVD1-5
4, 26 I/O
27-29
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
Mouse Data: connects to Host’s data line
Mouse Clock: connects to Host’s clock line
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, strobed sampling
Right Button: active low, strobed sampling
Sensor’s Excitation Driver: connect to X Right
Sensor’s Excitation Driver: connect to Y Bottom
Sensor’s Excitation Driver: connect to Y Top
Sensor’s Excitation Driver: connect to X Left
Sensor’s Excitation Driver: connect to X Left
Sensor’s Excitation Driver: connect to Y Top
Sensor’s Excitation Driver: connect to Y Bottom
Sensor’s Excitation Driver: connect to X Right
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: tie high if unused
and external mouse port is used; tie low if external
mouse port is unused
Reserved
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 ©1999-2001 Semtech Corporation
3
DOC7-TS2-P840-DS-106
www.semtech.com