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PDF SX8652 Data sheet ( Hoja de datos )
| Número de pieza | SX8652 | |
| Descripción | 15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SX8652
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
-----4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX8652 is a very low power, high reliability controller
for 4-wire and 5-wire resistive touch screens used in PDAs,
portable instruments and point-of-sales terminal
applications. It features a wide input supply range from
1.65V to 3.7V and low power modes to preserve current
when the screen is unintentionally touched.
To compute touch screen X-Y coordinates and touch
pressure with precision, a low power 12-bit analog-digital
converter is activated with the possibility to enable on-chip
data averaging processing algorithms to reduce host activity
and suppress system noise.
The touch screen controller inputs have been specially
designed to provide robust on-chip ESD protection of up to
±15kV in both HBM and Contact Discharge, and eliminates
the need for external protection devices. The SX8652 is
controlled by a high speed SPI™ serial interface.
The SX8652 is available in a 4.0 mm x 3.0 mm 14-DFN
package and a 1.5 mm x 2.0 mm wafer level chip scale
package (WLCSP) for space conscience applications.
APPLICATIONS
DSC, DVR, Cell Phones
PDA, Pagers
Point-of-Sales Terminals
Touch-Screen Monitors
ORDERING INFORMATION
Extremely Low Power Consumption: [email protected] 8kSPS
Superior On-chip ESD Protection
±15kV HBM (X+,X-,Y+,Y-)
±2kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
±300V MM
Single 1.65V to 3.7V Supply/Reference
4-Wire or 5-Wire Resistive Touch Screen Interface
Integrated Preprocessing Block to Reduce Host Loading
and Bus Activity
Four User Programmable Operation Modes provides
Flexibility to address Different Application Needs
Manual, Automatic, Pen Detect, Pen Trigger
Low Noise Ratiometric Conversion
Precision, High Speed 12-bit SAR ADC Operating At 74k
SPS
Throughput: 5000 (X-Y) coordinates/second (c/s) with 7-
Sample Averaging
Low Power Shut-Down Mode < 1uA
SPI™ Serial Interface
Touch Pressure Measurement (4-Wire)
Auxiliary Input (4-Wire) For Alternate ADC Input or Start
of Conversion Trigger
Hardware & Software reset
-40°C to +85°C operation
Part Number
SX8652ICSTRT1
SX8652IWLTRT1
1. 3000 Units / reel
Package (Dimension in mm) Marking
12 - Ball WLCSP (1.5x2.0) FG97
14 - Lead DFN (4.0x 3.0)
FG97
Pb-Free, Halogen Free, RoHS/WEEE compliant product
Windows CE 6.0, Linux Driver Support Available
Packages: 14-LD (4.0 mm x 3.0 mm) DFN
12-Ball (1.5 mm x 2.0 mm) WLCSP
To the
touch
screen
Revision V1.7/October 2010
©2010 Semtech Corp.
VDD
AUX/W IPER
X+/BR
Y+/TR
X-/TL
Y-/BL
Touch
Screen
Interface
Vref
C o n tro l
SX8652
VDD
N IR Q
POR
OSC
ref+
in ADC out
ref-
SPI
D ig ita l
Filter
NRST (D FN only)
NCS
SCLK
DOUT
D IN
To the
Host
Page 1
GND
www.semtech.com
1 page  
SX8652
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1.3. Pin Description
Pin Number Name
#
Type
Description
DFN WLCSP
1 A1 AUX/WIPER Digital Input /
Analog Input
Conversion Synchronization (4-wire) or
Analog Auxiliary Input (4-wire) / Wiper Input (5-wire)
2 A2 VDD
Power Input
Input power supply, connect to a 0.1uF capacitor to GND
3 A3 X+/BR
Analog IO
X+ Right electrode (4-wire) / Bottom Right (5-wire) channel
4 B3 Y+/TR
Analog IO
Y+ Top electrode (4-wire) /Top Right (5-wire) channel
5 C3 X-/TL
Analog IO
X- Left electrode (4-wire) /Top Left (5-wire) channel
6 D3 Y-/BL
Analog IO
Y- Bottom electrode (4-wire) /Bottom Left (5-wire) channel
7 D2 GND
Ground
Ground
8 D1 SCLK
Digital Input
SPI Serial Clock Input
9 C2 DIN
Digital Output
SPI Serial Data Input
10 C1 DOUT
Digital Output
SPI Serial Data Output
11 B1 NIRQ
Digital Output, open drain Interrupt Request Output, Active low, Need external pull-up
12 B2 NCS
Digital Input
SPI Chip Select Input, Active low
13 - NRST
Digital Input
DFN package only, Reset Input, Active low, Internal pull-up resistor
14 - (NC)
Not Connected
15 - GND
Power input
Backside Ground
Table 1. Pin description
1.4. Simplified Block Diagram
The SX8652 simplified block diagram is shown in Figure 3.
VDD
SX8652
VDD
Control
NIRQ
To the
touch
screen
AUX/WIPER
X+/BR
Y+/TR
X-/TL
Y-/BL
Touch
Screen
Interface
Vref
POR
OSC
SPI
ref+
in ADC out
ref-
Digital
Filter
NRST (DFN only)
NCS
SCLK
DOUT
DIN
To the
Host
GND
Figure 3. Simplified block diagram of the SX8652
Revision V1.7/October 2010
©2010 Semtech Corp.
Page 5
www.semtech.com
5 Page 
SX8652
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.2. Device Interface and ESD protection
The touch screen controller inputs have been specially designed to provide robust on-chip ESD protection of up to ±15kV
in both HBM and Contact Discharge.
3.2.1. Touchscreen interface
The X+/BR, X-/TL, Y+/TR,Y-/BL, AUX/WIPER are the pins dedicated for the touchscreen interface. It provides the voltage
sequence in order to obtain the coordinates and pressure measurement.
The five pins are connected to BR, TL, TR, BL, WIPER on a 5-wire touchscreen. They are the electrodes on the 4 corners
of the bottom layer of the touchscreen plus the electrode on the top layer.
On a 4-wire touchscreen, only 4 electrodes are used: X+,X-,Y+,Y-. The AUX pin is not needed and therefore can be used
to convert an analog signal (range GND - VDD) into 12-bit digital value. The touchscreen interface pins are the most
exposed pins for an ESD event.
As shown in Figure 7, theses pins have internal ESD protection to GROUND and VDD.
3.2.2. Host Interface and Control Pins
The SX8652 is a slave device configured via the SPI interface.
NIRQ provides an interrupt to the host processor when a pen is detected or when channel data is available. The NIRQ pin
is an active low, open drain output to facilitate interfacing to different supply voltages and thus requires an external pull-up
resistor (1-10 kOhm).
The host can reset the chip via the SPI interface or with the dedicated pin NRST. The NRST pin is an active low input that
provides a hardware reset. An internal pull-up enables the interfacing with devices at different supply voltage.
NRST and NIRQ pins are protected to GROUND.
X + /B R
X -/T L
Y + /T R
Y -/B L
AUX/
W ip e r
R chn
R chn
R chn
R chn
SPI
Touch
S creen
D rive rs
In te rfa c e
MUX
A
D
C
Power
M anagem ent
C o n tro l
D a ta P ro c e s s in g
VDD
GND
NRST
N IR Q
Figure 7. ESD protection
Revision V1.7/October 2010
©2010 Semtech Corp.
Page 11
www.semtech.com
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet SX8652.PDF ] | |
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