PIC16F870

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DLP-EVALP/DLP-EVALS
Evaluation Boards DLP-USB245M Adapter
GENERAL DESCRIPTION DLP-EVALP DLP-EVALS present straightforward approach designing target electronics that will both interface with take required operational power from DLP-USB245M Adapter. external power supply needed while still maintaining compliance with Specification.
Shown here with DLP-USB245M (purchased separately) both designs, 8-bit microcontroller used communicate with host DLP-USB245M Adapter. DLP-EVALP uses Microchip PIC16F870 microcontroller running 20MHz DLP-EVALS uses Ubicom/Scenix SX28 microcontroller running 50MHz. Application software
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provided that demonstrates sending receiving data between host Adapter. Four LED's provide visual feedback data being received from momentary contact, push-button switch instructs microcontroller send 512-byte data packet back host. Serving design example, both evaluation boards have DS-18S20 (TO-92 package) temperature sensor connected port microcontroller. DLP-EVALP DLP-EVALS both ship with firmware pre-programmed into their Flash (ROM) microcontroller that implements interface Windows software that will exercise temperature sensor, push-button, LED's. Windows software with source code (Visual V6.0) microcontroller firmware (HEX source) available free download from www.dlpdesign.com event that user wants reprogram microcontroller with different firmware, 5-pin header available that compatible with DLP-Flash programmer (purchased separately). single MOSFET transistor used drop board's current consumption nearly zero when host DLP-USB245M Standby mode. Refer schematics these evaluation boards (available upon purchase) datasheets Ubicom SX28 Microchip 16F873 microcontrollers additional details.
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TEST SOFTWARE Demonstration software (USBTEST.EXE) DLP-EVALx boards downloaded from Design website. software runs under Windows 98/ME/2000/XP. USBTEST.EXE will read DS18S20 sensor present temperature data numerically.
USBTEST.EXE exemplifies four communications techniques. echo loop-back function sends bytes data Adapter waits each byte echoed back before continuing. loop-back test performed with without Send Immediate (SI) feature enabled. enabled, FT245BM strobed force byte buffer immediately sent host.
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"Blink LED's" function writes data DLP-EVALx board DLP-USB245M board that performs binary count with LED's. slider control provided increase decrease rate which individual bytes sent. When slider speed control fastest position, 64-byte packet repeatedly sent adapter flash LED's speed microcontroller. "Send Bytes" function builds sends 128-byte packet data microcontroller. microcontroller simply reads discards data from FIFO memory FT245BM DLP-USB245M adapter board. speed this test limited speed microcontroller. When button DLP-EVALx board pressed, microcontroller creates sends 512-byte packet data host DLP-USB245M. returned data presented application's list box.
TEMPERATURE SENSOR WIRING DS-18S20 interfaced microcontroller using standard port 1.5K-ohm pull-up resistor. DS-18S20 removed from DLP-EVALx board purpose locating DS-18S20 significant distance from DLP-EVALx board using Category cable. Care must taken ensure correct wiring distance between DLP-EVALx DS-18S20 sensor increases. Category network cable must used distances greater than about feet keep capacitance low. twisted pair power ground, second twisted pair data ground.
DLP-EVALx
DATA
DS18S20
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POWER SUPPLY DLP-EVALx boards take needed operational power from host PC's port DLP-USB245M Adapter. When host goes standby mode, DLP-USB245M will also standby mode after milliseconds activity. When DLP-USB245M goes standby mode, takes SLEEP high, which powers down DLP-EVALx board.
Both EVALP EVALS circuits employ P-channel MOSFET control power. Once Windows enumerated DLP-USB245M module, FT245BM takes SLEEP line low. This circuit could also used control power higher-current applications since network connected gate MOSFET sets rise-time (limiting inrush current) power going target electronics.
MECHANICAL DRAWINGS (PRELIMINARY): [Inches (millimeters) unless otherwise noted]
0.12 (3.0 typ)
(40.6 typ)
(50.8 typ)
0.15 (3.8 typ)
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DISCLAIMER Neither whole part information contained herein product described this datasheet adapted reproduced material electronic form without prior written consent copyright holder. This product documentation supplied as-is basis, warranty their suitability particular purpose either made implied. Design will accept claim damages whatsoever arising result failure this product. Your statutory rights affected. This product variant intended medical appliance, device, system which failure product might reasonably expected result personal injury. This document provides preliminary information that subject change without notice.
CONTACT INFORMATION Design P.O. 503762 Diego, 92150-3762 Phone: 858-513-2777 Fax: 858-513-2777 Email: support@dlpdesign.com
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PIC16F870

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