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TDA8035HN Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA8035HN Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 32 page  TDA8035HN All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 1.0 — 19 April 2011 7 of 32 NXP Semiconductors TDA8035HN Smart card interface 8. Functional description Remark: Throughout this document the ISO 7816 terminology conventions have been adhered to and it is assumed that the reader is familiar with these. 8.1 Power Supply Power supply voltage VDDP should be in the range from 2.7 to 5.5 V All interface signals with the system controller are referenced to VDD(INTF). All card contacts remain inactive during powering up or powering down. Internal regulator VREG should be in the range of 1.8 V After powering the device, OFFN remains Low until CMDVCCN is set High and PRESN is Low . During power off, OFFN falls Low when VDDP is below the threshold voltage falling. The frequency of the internal oscillator Foscint used for the activation sequences is put in low frequency mode in order to save power consumption as long as CMDVCCN is kept at high level (card not activated). This device includes DC/DC converter to generate the 5 V, 3 V or 1.8 V card supply voltage (Vcc). The DC/DC converter should be supplied separately by Vddp and Gndp. The DC/DC converter operates as a voltage tripler, doubler or follower according to the respective values of Vcc and Vddp. The operating mode is as follows (see Figure 3): • Vcc = 5 V & Vddp > 3.8 V ; voltage doubler • Vcc = 5 V & Vddp < 3.6 V; voltage tripler • Vcc = 3 V & Vddp > 3.8 V; voltage follower • Vcc = 3 V & Vddp < 3.6 V; voltage doubler • Vcc = 1.8 V & Vddp > 3.8 V; voltage doubler • Vcc = 1.8 V & Vddp < 3.6 V; voltage tripler |
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