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PDF SX8651 Data sheet ( Hoja de datos )
| Número de pieza | SX8651 | |
| Descripción | Multitouch 4-wire Resistive Touchscreen Controller | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SX8651
Multitouch 4-wire Resistive Touchscreen
Controller with 15kV ESD Protection
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX8651 is a multitouch controller that enables a
completely different user interaction with 4-wire resistive
touchscreen. It enables detection of 2 fingers on the
touchscreen and several gestures like rotation and pinch/
stretch.
This ultra low power touchscreen controller has been
optimized for portable equipment where power and board-
space are at a premium.
It incorporates a highly accurate 12-bit ADC for data
conversion and operates from a single 1.65 to 3.7V supply
voltage.
The SX8651 features a built-in preprocessing algorithm for
data measurements, which greatly reduces the host
processing overhead and bus activity. This complete
touchscreen solution includes four user-selectable
operation modes which offer programmability on different
configurations such as conversion rate and settling time,
thus enable optimization in throughput and power
consumption for a wide range of touch sensing applications.
The touch screen 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 SX8651 is offered in two tiny packages: 3.0 mm x
3.0 mm DFN and a 1.5 mm x 2.0 mm wafer-level chip-scale
package (WLCSP).
APPLICATIONS
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
Compatible with a Wide Range of 4-wire Resistive
Touchscreen for Single/Multi-touch Operation
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
High Precision 12-bit Resolution
Low Noise Ratiometric Conversion
Selectable Polling or Interrupt Modes
Touch Pressure Measurement
400kHz Fast-Mode I²C Interface
Hardware Reset & I²C Software Reset
-40°C to 85°C Operation
Pin-compatible with SX8650
Android and Linux Driver Support Available
12-LD DFN Package / 12-Ball WLCSP Package
RoHS, WEEE, HF and pb free
Portable Equipment
Mobile Communication Devices
Cell phone, PDA, MP3, GPS, DSC
Touch Screen Monitors
Block Diagram
ORDERING INFORMATION
Part Number
SX8651ICSTRT1
SX8651IWLTRT1
Package (Dimension in mm)
12 - Ball WLCSP (1.5 x 2.0)
12 - Lead DFN (3.0 x 3.0)
1. 3000 Units / reel
Marking
FD77
FD77
Revision V1.5/December 2010
©2010 Semtech Corp.
VDD
X+
Y+
X-
Y-
GND
Touch
Screen
In te rfa c e
V re f
C o n tro l
SX8651 AUX
A0
NRST
POR
OSC
I2 C
SCL
ref+
in A D C out
ref-
D igital
F ilter
SDA
N IR Q
Page 1
HOST
www.semtech.com
1 page  
ADVANCED COMMUNICATIONS & SENSING
SX8651
Multitouch 4-wire Resistive Touchscreen
Controller with 15kV ESD Protection
DATASHEET
1.3. Pin Description
Pin Number #
DFN WLCSP
1 A2
2 A3
3 B3
4 C3
5 D3
6 D2
7 B1
8 C1
9 D1
10 C2
11 B2
12 A1
13
Name
VDD
X+
Y+
X-
Y-
GND
NIRQ
SDA
SCL
NRST
A0
AUX
GND
Type
Description
Power
Analog
Analog
Analog
Analog
Ground
Digital Output / Open Drain Output
Digital Input / Open Drain Output
Digital Input / Open Drain Output
Digital Input / Output
Digital Input
Digital Input/Analog Input
Ground
Input power supply connect to a 0.1uF capacitor to GND
X+ channel input
Y+ channel input
X- channel input
Y- channel input
Ground
Interrupt output, active low. Need external pull-up resistor
I2C data input/output
I2C clock, input/output
Reset Input, active low. Need external 50k pull-up resistor
I2C slave address selection input
Analog auxiliary input or conversion synchronization
Die attach paddle, connect to Ground
Table 1. Pin description
1.4. Simplified Block Diagram
The SX8651 simplified block diagram is shown in Figure 3.
VDD
X+
Y+
X- Touch
Screen
Y- Interface
GND
Vref
Control
SX8651 AUX
A0
POR
OSC
NRST
I2C
SCL
ref+
in ADC out
ref-
Digital
Filter
SDA
NIRQ
Figure 3. Simplified block diagram of the SX8651
Revision V1.5/December 2010
©2010 Semtech Corp.
Page 5
www.semtech.com
5 Page 
ADVANCED COMMUNICATIONS & SENSING
SX8651
Multitouch 4-wire Resistive Touchscreen
Controller with 15kV ESD Protection
DATASHEET
2.6. Typical Operating Characteristics
At Ta= -40°C to +85°C, VDD=1.7V to 3.7V, PowDly=0.5 us, SetDly=0.5us, Filt=1, Resistive touch screen sensor current not
taking in account, unless otherwise noted.
CURRENT IN PEN TRIGGER MODE
500
TOUCH SENSOR
NOT ACTIVATED
400
300
200
100
0
1.5
2
2.5
VDD(V)
3
3.5
SUPPLY CURRENT VS CONVERSION RATE
VDD=1.8V - X,Y CONVERSION
100
90
80
70
60
50
40
30
20
10
0
0
Filt=7
Filt=5
Filt=3
Filt=1
1234
Conversion Rate (kCPS)
5
SUPPLY CURRENT vs SAMPLE RATE
500
TOUCH SENSOR
X+ to X- =1000 Ohm
400 Y+ to Y- =1000 Ohm
300
200
V DD=3.3V
V DD=2.5V
V DD=1.65V
100
0
01 23 4
Sample Rate (kCPS)
5
SUPPLY CURRENT in MANUAL MODE
vs TEMPERATURE
700
600
500
400
300
200
100
0
-40
-20
VDD=3.3V
VDD=1.85V
0 20 40 60
Temperature (C)
80
100
SUPPLY CURRENT VS CONVERSION RATE
VDD=1.8V - X,Y, Z1, Z2 CONVERSION
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
Filt=7
Filt=5
Filt=3
Filt=1
1234
Conversion Rate (kCPS)
5
Revision V1.5/December 2010
©2010 Semtech Corp.
Page 11
www.semtech.com
11 Page | ||
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| PDF Descargar | [ Datasheet SX8651.PDF ] | |
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