Features KEY FEATURESAPPLICATIONS • Supports 4 wire resistive touch panels • Low power standby current typically less than 2 µA at 5.5V • Maximum speed of 500 coordinate pairs per second • Automatic wake up and return to standby • 10 bit A/D • On-chip touch screen current drivers - no external driver required • UART interface • Controller configurations are stored in the internal non-volatile storage element • Touch pressure can be measured • Personal Digital Assistants • Smart Hand-Held Devices • Touch Screen Monitors • Point-of-Sales Terminals • KIOSK • Pagers • Cell Phones Description 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. 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

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Datasheets

Title		Size	Date	Other Language
	LM8300/LM8500 Four Wire Resistive Touchscreen Controller with Brownout	327 Kbytes	26-Jan-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM8500IMT9B/NOPB LM8500IMT9B RoHS Status	TSSOP	Full production Lead Time: 21 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$6.04 each at 1K+ pcs	rail of 38

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM8500HLQ9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005
LM8500HVA9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005
LM8500IMT9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM8500IMT9B/NOPB LM8500IMT9B		TSSOP	48	2 2	260 235	Detail	N/A	N/A	NS2ZXYTTE# LM8500IMT9

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools

Title	Size	Date
Touchscreen Controllers - LM8000 Series Tools	97 Kbytes	3-Mar-2003

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM8500IMT9B	.5	0	14235	0	0	977500	4	277368294

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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM8500HLQ9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005
LM8500HVA9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005
LM8500IMT9	NONE	NATIONAL SEMICONDUCTOR	25 Oct 2005