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MXB7846EEE-MXB7846EUE
2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor
General DescriptionThe 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™ 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 0.5µW, while the typical power consumption at
125ksps throughput and a +2.7V supply is 650µW.
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°C to +85°C temperature range.
ApplicationsPersonal Digital Assistants
Portable Instruments
Point-of-Sales Terminals
Pagers
Touch-Screen Monitors
Cellular Phones
FeaturesESD-Protected ADC Inputs
±15kV IEC 61000-4-2 Air-Gap Discharge
±8kV IEC 61000-4-2 Contact DischargePin Compatible with MXB7843+2.375V to +5.25V Single SupplyInternal +2.5V ReferenceDirect Battery Measurement (0 to 6V)On-Chip Temperature MeasurementTouch-Pressure Measurement 4-Wire Touch-Screen InterfaceRatiometric ConversionSPI™/QSPI™, 3-Wire Serial Interface Programmable 8-/12-Bit ResolutionAuxiliary Analog InputAutomatic Shutdown Between ConversionsLow Power (External Reference)
270µA at 125ksps
115µA at 50ksps
25µA at 10ksps
5µA at 1ksps
2µA Shutdown Current
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
Pin Configuration
Ordering Information19-2436; Rev 1; 5/04
TransZorb is a trademark of Vishay Intertechnology, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
Typical Application Circuit appears at end of data sheet.
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDD, VBAT, DIN, CS, DCLK to GND........................-0.3V to +6V
Digital Outputs to GND...............................-0.3V to (VDD+ 0.3V)
VREF, X+, X-, Y+, Y-, AUX to GND..............-0.3V to (VDD+ 0.3V)
Maximum Current into Any Pin.........................................±50mA
Maximum ESD per IEC-61000-4-2 (per MIL STD-883 HBM)
X+, X-, Y+, Y-, VBAT, AUX......................................15kV (4kV)
All Other Pins..........................................................2kV (500V)
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.30mW/°C above +70°C).........667mW
16-Pin TSSOP (derate 5.70mW/°C above +70°C).......456mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VDD= 2.7V to 3.6V, VREF= 2.5V, fDCLK= 2MHz (50% duty cycle), fSAMPLE= 125kHz, 12-bit mode, 0.1µF capacitor at REF, TA=
TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
ELECTRICAL CHARACTERISTICS (continued)(VDD= 2.7V to 3.6V, VREF= 2.5V, fDCLK= 2MHz (50% duty cycle), fSAMPLE= 125kHz, 12-bit mode, 0.1µF capacitor at REF, TA=
TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
Note 1:Tested at VDD= 2.7V.
Note 2:Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 3:Offset nulled.
Note 4:Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 5:Resistance measured from the source to drain of the switch.
Note 6:External load should not change during conversion for specified accuracy.
Note 7:ADC performance is limited by the conversion noise floor, typically 300µVP-P. An external reference below 2.5V can com-
promise the ADC performance.
Note 8:Difference between Temp0 and Temp1. No calibration necessary.
TIMING CHARACTERISTICS (Figure 1)(VDD= 2.7V to 3.6V, VREF= 2.5V, fDCLK= 2MHz (50% duty cycle), fSAMPLE= 125kHz, 12-bit mode, 0.1µF capacitor at REF, TA=
Typical Operating Characteristics(VDD= 2.7V, VREF= 2.5VEXTERNAL, fDCLK= 2MHz, fSAMPLE= 125kHz, CLOAD= 50pF, 0.1µF capacitor at REF, TA= +25°C, unless
otherwise noted.)
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODEMXB7846 toc01
OUTPUT CODE
INL (LSB)
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MXB7846 toc02
OUTPUT CODE
DNL (LSB)
-1.0
CHANGE IN OFFSET ERROR
vs. SUPPLY VOLTAGE
MXB7846 toc04
SUPPLY VOLTAGE (V)
OFFSET ERROR (LSB)
TEMPERATURE(°C)
CHANGE IN GAIN ERROR
vs. SUPPLY VOLTAGEMXB7846 toc07
SUPPLY VOLTAGE (V)
GAIN ERROR (LSB)
SWITCH ON-RESISTANCE vs. SUPPLY VOLTAGE
(X+, Y+ : +VDD TO PIN; X-, Y- : TO GND)
MXB7846 toc03
SUPPLY VOLTAGE (V)
SWITCH ON-RESISTANCE vs. TEMPERATURE
(X+, Y+ : +VDD TO PIN; X-, Y- : PIN TO GND)
MXB7846 toc06
TEMPERATURE (°C)205-10-25
INTERNAL REFERENCE
vs. SUPPLY VOLTAGE
MXB7846 toc09
SUPPLY VOLTAGE (V)
INTERNAL REFERENCE (V)
2.05.5
