 |
Moteur de recherche de fiches techniques de composants électroniques |
|
|
Moteur de recherche de fiches techniques de composants électroniques |
|
TDA8005H Fiches technique(PDF) 11 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TDA8005H Fiches technique(HTML) 11 Page - NXP Semiconductors |
|
|
11 / 32 page  1996 Sep 25 11 Philips Semiconductors Product specification Low-power smart card coupler TDA8005 Clock circuitry The clock to the microcontroller and the clock to the card are derived from the main clock signal (XTAL from 2 to 16 MHz, or an external clock signal). Microcontroller clock (fclk) after reset, and during power reduction modes, the microcontroller is clocked with fINT/8, which is always present because it is derived from the internal oscillator and gives the lowest power consumption. When required, (for card session, serial communication or anything else) the microcontroller may choose to clock itself with 1 ⁄2fxtal, 1⁄4fxtal or 1⁄2fINT. All frequency changes are synchronous, thereby ensuring no hang-up due to short spikes etc. Cards clock: the microcontroller may select to send the card 1 ⁄2fxtal, 1⁄4fxtal, 1⁄8fxtal or 1⁄2fINT (≈1.25 MHz), or to stop the clock HIGH or LOW. All transition are synchronous, ensuring correct pulse length during start or change in accordance with ISO 7816. After power on, CLK is set at STOP LOW, and fclk is set at 1 ⁄8fINT. Power-down and sleep modes The TDA8005 offers a large flexibility for defining power reduction modes by software. Some configurations are described below. In the power-down mode, the microcontroller is in power-down and the supply and the internal oscillator are active. The card is not active; this is the smallest power consumption mode. Any change on P1 ports or on PRES will wake-up the circuit (for example, a key pressed on the keyboard, the card inserted or taken off). In the sleep mode, the card is powered, but configured in the Idle or sleep mode. The step-up converter will only be active when it is necessary to reactivate VUP. When the microcontroller is in Power-down mode any change on P1 ports or on PRES will wake up the circuit. In both power reduction modes the sequencer is active, allowing automatic emergency deactivation in the event of card take-off, hardware problems, or supply drop-out. The TDA8005 is set into Power-down or sleep mode by software. There are several ways to return to normal mode, Introduction or extraction of the card, detection of a change on P1 (which can be a key pressed) or a command from the system microcontroller. For example, if the system monitors the clock on XTAL1, it may stop this clock after setting the device into power-down mode and then wake it up when sending the clock again. In this situation, the internal clock should have been chosen before the fclk. Peripheral interface This block allows synchronous serial communication with the three peripherals (ISO UART, CLOCK CIRCUITRY and OUTPUT PORTS EXTENSION). Fig.5 Peripheral interface diagram. handbook, full pagewidth MBH635 CC0 CC1 CC2 CC3 CC4 CC5 CC6 CC7 clock configuration RESET UC0 UC1 UC2 UC3 UC4 UC5 UC6 UC7 Uart configuration UT0 UT1 UT2 UT3 UT4 UT5 UT6 UT7 Uart transmit UR0 UR1 UR2 UR3 UR4 UR5 UR6 UR7 Uart receive PERIPHERAL CONTROL US0 US1 US2 US3 US4 US5 US6 US7 Uart status register PE0 PE1 PE2 PE3 PE4 PE5 PE6 PE7 ports extension P07 ENABLE P06 STROBE P24 DATA P27 REG0 P26 REG1 P25 R/W P32 INT |
Numéro de pièce similaire - TDA8005H |
|
Description similaire - TDA8005H |
|
|
Lien URL |
| Politique de confidentialité |
| ALLDATASHEET.FR |
| ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |
French ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
