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TDA8020HL Folha de dados(PDF) 7 Page - NXP Semiconductors |
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TDA8020HL Folha de dados(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 2003 Nov 06 7 Philips Semiconductors Product specification Dual IC card interface TDA8020HL FUNCTIONAL DESCRIPTION Throughout this specification, it is assumed that the reader is familiar with ISO 7816 terminology. Supply The TDA8020HL operates with a supply voltage from 2.7 to 6.5 V. An integrated voltage supervisor ensures that no spike appears on cards contacts during power-on or off. The supervisor also initializes the device, and forces an automatic emergency deactivation of the contacts in the event of a supply drop-out. As long as the supply voltage is below the threshold voltage Vth1, the capacitor CDEL remains uncharged. When the supply voltage reaches Vth1 and Vhys1, then CDEL is charged with a small current source of approximately 2 µA. When the voltage on CDEL reaches Vth2, then the supervisor is no longer active. As long as the supervisor is active (pin IRQ is LOW), bit SUPL in the status register is set. When pin IRQ goes HIGH the voltage supervisor becomes inactive (see Fig.3). Separate supply pins are used for the DC-to-DC converter, allowing specific decoupling for counteracting the noise the switching transistors may induce on the supply. A specific reference supply voltage, VDDI, is used for the interface signals CLKIN1, CLKIN2, I/O1uC, I/O2uC, SAD0, SAD1, SCL, SDA and IRQ, which can be lower than VDD (minimum 1.5 V), thus allowing direct control with a low voltage supplied device. Pins SCL, SDA and IRQ are open-drain outputs, and may be externally pulled up to a voltage higher than VDD. handbook, full pagewidth tw tw FCE835 BUS OK BUS NOT RESPONDING BUS NOT RESPONDING BUS NOT RESPONDING BUS OK status read after event VDD Vth1 + Vhys1 Vth1 Vth2 VCDEL IRQ Fig.3 Voltage supervisor. |
Nº de peça semelhante - TDA8020HL |
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Descrição semelhante - TDA8020HL |
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