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TDA8029 Datasheet(PDF) 42 Page - NXP Semiconductors |
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TDA8029 Datasheet(HTML) 42 Page - NXP Semiconductors |
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42 / 59 page  9397 750 14145 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 03 — 22 February 2005 42 of 59 Philips Semiconductors TDA8029 Low power single card reader There are several possible situations: • VDCIN = 3 V and VCC = 3 V: In this case the DC-to-DC converter is acting as a doubler with a regulation of about 4.0 V • VDCIN = 3 V and VCC = 5 V: In this case the DC-to-DC converter is acting as a tripler with a regulation of about 5.5 V • VDCIN = 5 V and VCC = 3 V: In this case, the DC-to-DC converter is acting as a follower, VDD is applied on VUP • VDCIN = 5 V and VCC = 5 V. In this case, the DC-to-DC converter is acting as a doubler with a regulation of about 5.5 V • VCC = 1.8 V. In this case, whatever value of VDCIN, the DC-to-DC converter is acting as a follower, VDD is applied on VUP. The switch between different modes of the DC-to-DC converter is done by the TDA8029 at about VDCIN = 3.5 V. The output voltage is fed to the VCC generator. VCC and GNDC are used as a reference for all other card contacts. 8.13 ISO 7816 security The correct sequence during activation and deactivation of the card is ensured through a specific sequencer, clocked by a division ratio of the internal oscillator. Activation (bit START = 1 in register PCR) is only possible if the card is present (pin PRES is HIGH) and if the supply voltage is correct (supervisor not active). Pin PRES is internally biased with a current source of 45 µA typical to ground when the pin is open (No card present). When pin PRES becomes HIGH, via the detection switch connected to VDD, this internal bias current is reduced to 2.5 µA to ground. This feature allows direct connection of the detect switch to VDD without a pull-down resistor. The presence of the card is signalled to the controller by the HSR. Bit PR1 in register MSR is set if the card is present. Bit PRL1 in register HSR is set if PR1 has toggled. During a session, the sequencer performs an automatic emergency deactivation on the card in the event of card take-off, short-circuit, supply dropout or overheating. The card is also automatically deactivated in case of supply voltage drop or overheating. The HSR register is updated and the INT0_N line falls down, so the system controller is aware of what happened. 8.14 Protections and limitations The TDA8029 features the following protections and limitations: • ICC limited to 100 mA, and deactivation when this limit is reached • Current to or from pin RST limited to 20 mA, and deactivation when this limit is reached • Deactivation when the temperature of the die exceeds 150 °C • Current to or from pin I/O limited to 10 mA |
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