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MXB7843EUE Datasheet

  • MXB7843EUE

  • 2.375V to 5.25V, 4-Wire Touch-Screen

  • 21頁

  • MAXIM   MAXIM

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19-2435; Rev 0; 4/02
2.375V to 5.25V, 4-Wire Touch-Screen
Controller
General Description
The MXB7843 is an industry-standard 4-wire touch-
screen controller. It contains a 12-bit sampling analog-
to-digital converter (ADC) with a synchronous serial
interface and low on-resistance switches for driving
resistive touch screens. The MXB7843 uses an external
reference. The MXB7843 can make absolute or ratio-
metric measurements. The MXB7843 has two auxiliary
ADC inputs. All analog inputs are fully ESD protected,
eliminating the need for external TransZorb鈩?devices.
The MXB7843 is guaranteed to operate with a single
2.375V to 5.25V supply voltage. In shutdown mode, the
typical power consumption is reduced to under 0.5碌W,
while the typical power consumption at 125ksps
throughput and a 2.7V supply is 650碌W.
Low-power operation makes the MXB7843 ideal for bat-
tery-operated systems, such as personal digital assis-
tants with resistive touch screens and other portable
equipment. The MXB7843 is available in 16-pin QSOP
and TSSOP packages, and is guaranteed over the
-40擄C to +85擄C temperature range.
Features
o
ESD-Protected ADC Inputs
鹵15kV IEC 61000-4-2 Air-Gap Discharge
鹵8kV IEC 61000-4-2 Contact Discharge
o
Pin Compatible with MXB7846
o
+2.375V to +5.25V Single Supply
o
4-Wire Touch-Screen Interface
o
Ratiometric Conversion
o
SPI鈩?QSPI鈩? 3-Wire Serial Interface
o
Programmable 8-/12-Bit Resolution
o
Two Auxiliary Analog Inputs
o
Automatic Shutdown Between Conversions
o
Low Power
270碌A at 125ksps
115碌A at 50ksps
25碌A at 10ksps
5碌A at 1ksps
2碌A Shutdown Current
MXB7843
Applications
Personal Digital Assistants
Portable Instruments
Point-of-Sales Terminals
Pagers
Touch-Screen Monitors
Cellular Phones
Ordering Information
PART
MXB7843EEE
MXB7843EUE
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
16 QSOP
16 TSSOP
Typical Application Circuit appears at end of data sheet.
TransZorb is a trademark of General Semiconductor Industries,
Inc.
SPI/QSPI are trademarks of National Semiconductor Corp.
Pin Configuration
TOP VIEW
V
DD
1
X+ 2
Y+ 3
X- 4
Y- 5
GND 6
IN3 7
IN4 8
16 DCLK
15 CS
14 DIN
MXB7843
13 BUSY
12 DOUT
11 PENIRQ
10 V
DD
9
REF
QSOP/TSSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MXB7843EUE 產品屬性

  • Maxim Integrated Products

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