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LM8500

Features: The LM8300/8500 is a 4-wire resistive touch screen controller.The controller samples and drives the touch screen without the need of any external hardware. The built in 10-bit A/D provides a maximum of 500 coordinate pairs per second (cpps). The data sampled from the touch screen is sent...

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LM8500: Features: The LM8300/8500 is a 4-wire resistive touch screen controller.The controller samples and drives the touch screen without the need of any external hardware. The built in 10-bit A/D provides...

LM8500 Data Sheet

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Part Number:
LM8500
Supply Ability:
5000

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Product Details

Description



Features:

The LM8300/8500 is a 4-wire resistive touch screen controller.

The controller samples and drives the touch screen without the need of any external hardware. The built in 10-bit A/D provides a maximum of 500 coordinate pairs per second (cpps). The data sampled from the touch screen is sent out on the UART at a speed of 38400 bps.

The controller has a power-saving mode which causes the controller to self-power down when no touch is detected on the touch screen for a specified amount of time. In the self-power down mode, the current drawn is typically less than 2 µA. The device resumes normal operation when a touch is detected on the touch screen or communication is detected on the UART. In addition to the self-power down mode, the controller can be disabled by pulling the SHUTDOWN pin low. The controller resumes normal operation when the SHUTDOWN pin is tristated or pulled high.

The controller has an internal non-volatile memory storage element to store configuration data such as calibration points or controller configurations.




Application

·Personal Digital Assistants
·Smart Hand-Held Devices
·Touch Screen Monitors
·Point-of-Sales Terminals
·KIOSK
·Pagers
·Cell Phones




Pinout

Connection Diagram




Specifications

Temperature Min 0 deg C
Temperature Max 70 deg C
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Supply Voltage (VCC) 7V
Voltage at Any Pin−0.3V to VCC +0.3V
Total Current into VCC Pin (Source) 200 mA
Total Current out of GND Pin (Sink)200 mA
Storage Temperature Range −65 to +140
ESD Protection Level 2 kV (Human BodyModel)




Description

The LM8500 is a 4-wire resistive touch screen controller. The controller samples and drives the touch screen without the need of any external hardware. The built in 10-bit A/D provides a maximum of 500 coordinate pairs per second (cpps). The data sampled from the touch screen is sent out on the UART at a speed of 38400 bps.

The LM8500 has a power-saving mode which causes the controller to self-power down when no touch is detected on the touch screen for a specified amount of time. In the self-power down mode, the current drawn is typically less than 2 µA. The device resumes normal operation when a touch is detected on the touch screen or communication is detected on the UART. In addition to the self-power down mode, the controller can be disabled by pulling the SHUTDOWN pin low. The controller resumes normal operation when the SHUTDOWN pin is tristated or pulled high.

The LM8500 has an internal non-volatile memory storage element to store configuration data such as calibration points or controller configurations.

Devices included in this datasheet:

Device OperatingVoltage BrownoutVoltage OperatingFrequency I/OPins Packages Temperature
LM8300 3, 5 V 2.7 to 2.9 V 3.27 MHz 18 44 LLP, 44 PLCC, 48 TSSOP 0°C to +70°C
LM8500 5 V 4.17V to 4.5V 3.27, 10 MHz 18 44 LLP, 44 PLCC, 48 TSSOP 0°C to +70°C

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM8500IMT9B .5 0 13425 0 0 932500 4 264599421

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools

Title Size in Kbytes Date
Touchscreen Controllers - LM8000 Series Tools 97 Kbytes 3-Mar-2003 View Online Download

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