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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA8006AH Fiches technique(PDF) 11 Page - NXP Semiconductors |
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TDA8006AH Fiches technique(HTML) 11 Page - NXP Semiconductors |
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11 / 40 page  2000 Feb 21 11 Philips Semiconductors Product specification Multiprotocol IC Card coupler TDA8006 Table 3 Other register byte addresses Supply The circuit operates within a supply voltage range of 4.2 to 6 V. The supply pins are VDD, VDDA, GND, AGND, VDDRAM and GNDRAM. Pins VDDA and AGND supply the card analog drivers and have to be externally decoupled because of the large current spikes that the card and the step-up converter can create. VDDRAM and GNDRAM supply the auxiliary RAM and should be decoupled separately. VDD and GND supply the rest of the chip. An integrated spike killer ensures the contacts to the card remain inactive during power-up or power-down. An internally generated voltage reference is used by the step-up converter, the voltage supervisor and the VCC generator. If VDD is too low to ensure proper operation, the voltage supervisor generates an alarm pulse, whose length is defined by an external capacitor tied to the CDELAY pin, (1 ms per 1 nF typical). This pulse is used to reset the controller and is used in parallel with an external reset input which can come from the system controller. It is also used to either block any spurious on-card contacts during a controller reset or to force an automatic deactivation of the contacts in the event of supply drop-out (see Sections “Activation sequence” and “Deactivation sequence”). It is also fed to an external open-drain output (called ALARM) which can be chosen active HIGH or LOW by mask option (see Table 12). Step-up converter Except for the VCC generator and the other card contact buffers, the whole circuit is powered by VDD, VDDA and VDDRAM. If the supply voltage is 4.2 V, then a higher voltage is needed for the supply to the ISO contacts. When a card session is requested by the controller, the sequencer first starts the step-up converter. This uses switched capacitors which are clocked at a frequency of approximately 2.5 MHz by an internal oscillator. The output voltage VUP is regulated at approximately 6 V and then fed to the VCC generator. VCC and GND are used as a reference for all other card contacts. REGISTER BYTE ADDRESS (HEX) BIT RESET VALUE SP 81 0000 0111 DPL 82 0000 0000 DPH 83 0000 0000 PCON 87 0000 0000 TMOD 89 0000 0000 TL0 8A 0000 0000 TL1 8B 0000 0000 TH0 8C 0000 0000 TH1 8D 0000 0000 S0BUF 99 XXXX XXXX RCAP2L CA 0000 0000 RCAP2H CB 0000 0000 TL2 CC 0000 0000 TH2 CD 0000 0000 handbook, full pagewidth MGR228 Vth(VDD) VDD Vth(CDELAY) CDELAY ALARM tW Fig.4 Voltage supervisor. |
Numéro de pièce similaire - TDA8006AH |
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Description similaire - TDA8006AH |
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