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TDA8025HN データシート(PDF) 8 Page - NXP Semiconductors |
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TDA8025HN データシート(HTML) 8 Page - NXP Semiconductors |
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8 / 38 page  TDA8025_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 6 April 2009 8 of 38 NXP Semiconductors TDA8025 IC card interface After powering up the device, pin OFFN remains LOW until pins CMDVCCN and PRES are both HIGH or pin CMDVCCN is HIGH and pin PRESN is LOW. During power off, pin OFFN is driven LOW when VDD(INTREGD) is below the falling threshold voltage (Vth). When pin CMDVCCN is HIGH, the internal oscillator frequency (fosc(int)) is switched to Low frequency (inactive) mode to reduce power consumption. 8.2 Voltage supervisors 8.2.1 Block diagram 8.2.2 Description The voltage supervisors provide both the Power-On Reset (POR) and supply drop-out detection functions. They control the internal regulated supply voltage (VDD(INTREGD)) and the microcontroller interface supply voltage (VDD(INTF)) to ensure problem-free operation of the TDA8025. By monitoring both VDD(INTREGD) and VDD(INTF), the voltage supervisors ensure these voltages are high enough to ensure correct operation of the TDA8025 and flawless communication between it and the microcontroller. This information is combined and sent to the digital controller in order to reset the TDA8025. An extension of the power-on reset pulse width of ± 8ms(tw(POR)) is used to maintain the TDA8025 in inactive mode after the supply voltage power on or off sequences (see Figure 5). Fig 4. Voltage supervisor circuit 001aai961 REFERENCE VOLTAGE VDD(INTREGD) VDD(INTREGD) VDD(INTF) PORADJ R1 R2 Fig 5. Voltage supervisors VDD(INTREGD) and VDD(INTF) 001aai962 tw(POR) tw(POR) Vth + Vhys Vth VDD(INTREGD) ALARMN (internal signal) Power on Supply dropout Power off |
同様の部品番号 - TDA8025HN |
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同様の説明 - TDA8025HN |
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