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MXB7846EUE Datasheet

  • MXB7846EUE

  • 2.375V to 5.25V, 4-Wire Touch-Screen Controller with Interna...

  • 23頁(yè)

  • MAXIM   MAXIM

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19-2436; Rev 1; 5/04
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
General Description
The MXB7846 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 MXB7846 uses an internal
+2.5V reference or an external reference. The
MXB7846 can make absolute or ratiometric measure-
ments. In addition, this device has an on-chip tempera-
ture sensor, a battery-monitoring channel, and has the
ability to perform touch-pressure measurements without
external components. The MXB7846 has one auxiliary
ADC input. All analog inputs are fully ESD protected,
eliminating the need for external TransZorb鈩?devices.
The MXB7846 is guaranteed to operate with a supply
voltage down to +2.375V when used with an external
reference or +2.7V with an internal reference. In shut-
down 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 MXB7846 ideal for bat-
tery-operated systems, such as personal digital assis-
tants with resistive touch screens and other portable
equipment. The MXB7846 is available in 16-pin QSOP
and TSSOP packages, and is guaranteed over the
-40擄C to +85擄C temperature range.
Features
鈾?/div>
ESD-Protected ADC Inputs
鹵15kV IEC 61000-4-2 Air-Gap Discharge
鹵8kV IEC 61000-4-2 Contact Discharge
鈾?/div>
Pin Compatible with MXB7843
鈾?/div>
+2.375V to +5.25V Single Supply
鈾?/div>
Internal +2.5V Reference
鈾?/div>
Direct Battery Measurement (0 to 6V)
鈾?/div>
On-Chip Temperature Measurement
鈾?/div>
Touch-Pressure Measurement
鈾?/div>
4-Wire Touch-Screen Interface
鈾?/div>
Ratiometric Conversion
鈾?/div>
SPI鈩?QSPI鈩? 3-Wire Serial Interface
鈾?/div>
Programmable 8-/12-Bit Resolution
鈾?/div>
Auxiliary Analog Input
鈾?/div>
Automatic Shutdown Between Conversions
鈾?/div>
Low Power (External Reference)
270碌A(chǔ) at 125ksps
115碌A(chǔ) at 50ksps
25碌A(chǔ) at 10ksps
5碌A(chǔ) at 1ksps
2碌A(chǔ) Shutdown Current
MXB7846
Applications
Personal Digital Assistants
Portable Instruments
Point-of-Sales Terminals
Pagers
Touch-Screen Monitors
Cellular Phones
Typical Application Circuit appears at end of data sheet.
TransZorb is a trademark of Vishay Intertechnology, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
Ordering Information
PART
MXB7846EEE
MXB7846EUE
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
16 QSOP
16 TSSOP
Pin Configuration
TOP VIEW
V
DD
1
X+ 2
Y+ 3
X- 4
Y- 5
GND 6
BAT 7
AUX 8
16 DCLK
15 CS
14 DIN
MXB7846
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.

MXB7846EUE 產(chǎn)品屬性

  • Maxim Integrated Products

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