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TDA8025 データシート(PDF) 7 Page - NXP Semiconductors |
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TDA8025 データシート(HTML) 7 Page - NXP Semiconductors |
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7 / 38 page  TDA8025_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 6 April 2009 7 of 38 NXP Semiconductors TDA8025 IC card interface 8. Functional description Remark: Throughout this document the ISO7816 terminology conventions have been adhered to and it is assumed that the reader is familiar with these. 8.1 Power supplies Two supply selections can be made using pin CONFIG (see Figure 3) depending on the active state of the pin: • pin CONFIG is LOW: supply is pin VDDI(REG). The voltage range of the pin is between 3.6 V and 5.5 V. The regulator output range is between 3 V and 3.6 V. • pin CONFIG is HIGH: supply pins VDDI(REG) and VDD(INTREGD) are connected together to bypass the regulator. Pin VDDI(REG) voltage is between 3 V and 3.6 V. Remark: VDD(INTF) must not exceed VDD(INTREGD) + 0.3 V. The following examples illustrate the voltage restrictions for VDD(INTF). • CONFIG pin driven to GND: when VDD(INTREGD) is generated by the internal regulator, VDD(INTF) must not exceed 3.3 V. • CONFIG pin is driven by VDDI(REG) without VDD(INTF) tied to VDDI(REG) while VDD(INTREGD) is tied to VDDI(REG): VDD(INTF) must not exceed VDDI(REG) + 0.3 V. • CONFIG pin is driven by VDDI(REG) with VDD(INTF) tied to both VDDI(REG) and VDD(INTREGD): there no are restrictions for VDD(INTF). The TDA8025 is held in the reset state until VDD(INTREGD) reaches Vth +Vhys and PORADJ Vth +Vhys plus the tw(POR) delay. If the VDD(INTREGD) and PORADJ signals fall below Vth, an automatic contact deactivation is triggered. All interface signals to the microcontroller are referenced to VDD(INTF). In addition, all card contacts remain inactive during power-up and power-down cycles. 3.6V<VDDI(REG) <5.5 V 3V<VDD(INTREGD) < 3.6 V Fig 3. Power strategy 001aai959 470 nF 100 nF 10 µF 10 µF 220 nF REGULATOR INTERNAL REFERENCE VOLTAGE SENSE SUPPLY VCC LOOP 18 21 16 20 19 VDDI(REG) CONFIG GND VDD(INTREGD) VCC 14 CGND 001aai960 470 nF 100 nF 10 µF 220 nF REGULATOR INTERNAL REFERENCE VOLTAGE SENSE SUPPLY VCC LOOP 18 21 16 20 19 VDDI(REG) CONFIG GND VDD(INTREGD) VCC 14 CGND |
同様の部品番号 - TDA8025 |
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同様の説明 - TDA8025 |
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