 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
COP8782CWM Datasheet(PDF) 21 Page - National Semiconductor (TI) |
|
|
|
|||||||||||||||||||||||||||||
COP8782CWM Datasheet(HTML) 21 Page - National Semiconductor (TI) |
|
|
21 / 28 page  Development Support (Continued) CUSTOMER RESPONSE CENTER Complete product information and technical support is avail- able from National’s customer response centers CANADAUS Tel (800) 272-9959 email support tevm2nsccom EUROPE email europesupport nsccom Deutsch Tel a 49 (0) 180-530 85 85 English Tel a 49 (0) 180-532 78 32 Fran ais Tel a 49 (0) 180-532 93 58 Italiano Tel a 49 (0) 180-534 16 80 JAPAN Tel a 81-043-299-2309 SE ASIA Beijing Tel (a86) 10-6856-8601 Shanghai Tel (a86) 21-6415-4092 Hong Kong Tel (a852) 2737-1600 Korea Tel (a82) 2-3771-6909 Malaysia Tel (a60-4) 644-9061 Singapore Tel (a65) 255-2226 Taiwan Tel a 886-2-521-3288 AUSTRALIA Tel (a61) 3-9558-9999 INDIA Tel (a91) 80-559-9467 Programming Considerations In addition to the application program the ECON register needs to be programmed as well The following tables pro- vide examples of some ECON register values For more de- tailed information refer to the ECON REGISTER section EPROM Security Disabled RAM External RC Crystal Memory CKI Oscillator Oscillator 64 Bytes 38 30 20 128 Bytes 3A 32 22 EPROM Security Enabled RAM External RC Crystal Memory CKI Oscillator Oscillator 64 Bytes 18 10 00 128 Bytes 1A 12 02 EPROM programmer manufacturers may not all calculate a ‘‘checksum’’ the same way Before implementing an in- house verification by comparing checksums need to ensure how each programming system utilized calculates a check- sum It is strongly recommended not to include the ECON register in the checksum for not all programmers include this byte in their calculated checksum ERASING THE COP8780C EPROM The EPROM program memory is erased by exposing the transparent window on the UV erasable packages to an ul- traviolet light source Erasure begins to occur when ex- posed to light with wavelengths shorter than approximately 4000 Angstroms ( ) It should be noted that sunlight and certain types of fluorescent lamps have wavelengths in the 3000 to 4000 range After programming ‘‘truly opaque’’ labels should be placed over the window of the device to prevent functional failure due to the generation of photo currents erasure and exces- sive HALT current The term ‘‘truly opaque’’ needs addition- al clarification when used in the context of covering quartz windows on these devices The typical white colored stick- ers or labels are normally used for they are easy to write on These stickers are not opaque but translucent they do let a certain percentage of UV-light through The black write-pro- tect labels supplied with 525 floppy disks work extremely well If problems are encountered during programming (fails blank check) or during normal operation (intermittent func- tional or logical failures) need to determine first if an appro- priate opaque label is being used to cover the quartz win- dow at all times Note that the device will also draw more current than normal (especially in HALT mode) when the window of the device is not covered with an opaque label The recommended erasure procedure for the device is ex- posure to short wave ultraviolet light which has a wave- length of 2537 The integrated dose (UV intensity c expo- sure time) for erasure should be a minimum of 30W-sec cm2 The device should be placed within one inch of the lamp tubes during erasure Some lamps have a filter on their tubes which should be removed before erasure The follow- ing table shows the minimum erasure time for various light intensities Minimum Erasure Time Light Intensity Erasure Time (Micro-Wattscm2) (Minutes) 15000 36 10000 50 8500 60 Does not include light intensity ramp up time An erasure system should be calibrated periodically The distance from lamp to device should be maintained at one inch The erasure time increases as the square of the dis- tance Lamps lose intensity as they age When a lamp has aged the system should be checked to make certain that adequate UV dosages are being applied for full erasure Common symptoms of insufficient erasure are Inability to be programmed Operational malfunctions associated with VCC tempera- ture or clock frequency Loss of data in program memory A change in configuration values in the ECON register http www nationalcom 21 |
|
Enlace URL |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Enlace a la hoja de datos | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Mexican ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
