поискавой системы для электроныых деталей |
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TDA8020 датащи(PDF) 9 Page - NXP Semiconductors |
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TDA8020 датащи(HTML) 9 Page - NXP Semiconductors |
9 / 24 page 2001 Aug 15 9 Philips Semiconductors Product specification Dual smart card interface TDA8020HL READING STATUS START, ADDRESS, READ, STATUS byte, STOP. Table 4 STATUS bits (all bits cleared after power-on, except SUPL and PRES) When one of the bits PRESL, MUTE, EARLY and PROT is set, then pin IRQ goes LOW until the status byte has been read. After power-on, bit SUPL is set until the status byte has been read, and pin IRQ is LOW until the supervisor becomes inactive. NAME BIT DESCRIPTION PRES 0 set when the card is present; reset when the card is not present PRESL 1 set when the card has been inserted or extracted; reset when the status has been read I/O 2 set when I/O is HIGH and reset if I/O is LOW SUPL 3 set when the supervisor has signalled a fault; reset when the status has been read PROT 4 set when an overload or an overheating has occurred during a session; reset when the status has been read MUTE 5 set during ATR when the selected card has not answered during the ISO 7816 time slots EARLY 6 set during ATR when the selected card has answered too early ACTIVE 7 set if the card is active; reset if the card is inactive DC/DC converter VCC1 is the supply voltage for card 1 contacts, VCC2 for card 2 contacts. Card 1 and card 2 may be independently powered-down, powered at 5 V or powered at 3 V. A capacitor type step-up converter is used for generating these voltages. This step-up converter acts either as a doubler, tripler or follower. If VCC is the maximum value of VCC1 and VCC2, then there are 4 possible situations: • VDD = 3 V and VCC = 3 V: in this case, the DC/DC converter acts as a doubler with a regulation of approximately 4.0 V • VDD = 3 V and VCC = 5 V: in this case, the DC/DC converter acts as a tripler with a regulation of approximately 5.5 V • VDD = 5 V and VCC = 3 V: in this case, the DC/DC converter acts as a follower: VDD is applied on VUP • VDD = 5 V and VCC = 5 V: in this case, the DC/DC converter acts as a doubler with a regulation of approximately 5.5 V. The switch between the modes is automatically executed when VDD is approximately 3.4 V. Each card may independently draw a current up to 65 mA, also during activation, with a supply voltage from 2.5 V up to 6.5 V provided the sum of ICC1 and ICC2 does not exceed 80 mA. If VDD > 3 V, for 5 V cards, then both cards can draw up to 55 mA at the same time. If VDD > 3.3 V, for 3 V cards, then both cards can draw up to 50 mA at the same time. The DC/DC converter is powered with specific pins (VDDA and AGND) to enable separate decoupling. The output voltage, VUP, is internally fed to the VCC generators. VCC1,VCC2 and CGND1, CGND2 are used as a reference for all other cards contacts. Sequencers and clock counter Two sequencers are used to ensure activation and deactivation sequences according to ISO 7816 and EMV norms, even in the event of an emergency (card removal during transaction, supply drop-out and hardware problem). The sequencers are clocked by the internal oscillator. The activation of a card is initiated by setting the card select bit and the start bit within the control register. This is only possible if the card is present and if the voltage supervisor is not active. During activation the DC/DC converter is initiated (except if another card is already powered up or if VDD = 5 V and VCC = 3 V). VCC then goes high to the selected voltage (3 or 5 V), the I/O lines are then enabled and the clock is started with RST LOW. |
Аналогичный номер детали - TDA8020 |
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Аналогичное описание - TDA8020 |
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