Moteur de recherche de fiches techniques de composants électroniques |
|
ST8004 Fiches technique(PDF) 11 Page - STMicroelectronics |
|
ST8004 Fiches technique(HTML) 11 Page - STMicroelectronics |
11 / 19 page ST8004 11/19 Figure 6 : Emergency deactivation sequence Figure 7 : Definition of output transition times FUNCTIONAL DESCRIPTION Throughout this document it is assumed that the reader is familiar with iso7816 norm terminology POWER SUPPLY The supply pins for the IC are VDD and GND. VDD should be in the range of 2.7 to 6.5 V. All interface signals with the microcontroller are referenced to VDD; therefore be sure the supply voltage of the microcontroller is also at VDD. All card contacts remain inactive during powering up or powering down. The sequencer is not activated until VDD reaches Vth2 +Vhys(th2) or Vth3 +Vhys(th3) when VTHSEL = GND. When VDD falls below Vth2 or Vth3, an automatic deactivation of the contacts is performed. To generate a 5V ±5% VCC supply to the card, an integrated voltage doubler is incorporated. This step-up converter should be separately supplied by VDDP and PGND (from 4.5 to 6.5 V). In order to satisfy the VI(RIPPLE)(P-P) specifications, VDDP should be from 4.75V to 5.25V. Due to large transient currents, the 2x100 nF capacitors of the step-up converter should have an ESR of less than 100 m Ω, and be located as near as possible to the IC. The supply voltages VDD and VDDP may be applied to the IC in any time sequence. To get the correct deactivation of the card VDDP is allowed to turn-off only when VDD is below the undervoltage threshold. If a voltage between 7 and 9 V is available within the application, this voltage may |
Numéro de pièce similaire - ST8004 |
|
Description similaire - ST8004 |
|
|
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 |