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TDA8004 数据表(PDF) 9 Page - NXP Semiconductors |
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TDA8004 数据表(HTML) 9 Page - NXP Semiconductors |
9 / 22 page 2004 May 10 9 Philips Semiconductors Product specification IC card interface TDA8004AT FCE662 OSC_INT/64 CMDVCC VUP VCC I/O CLK RSTIN RST high - Z tact t0 t1 t2 t3 t4 t5 ATR Fig.5 Activation sequence. Active state When the activation sequence is completed, the TDA8004AT will be in the active state. Data is exchanged between the card and the microcontroller via the I/O lines. The TDA8004AT is designed for cards without VPP (this is the voltage required to program or erase the internal non-volatile memory). Depending on the layout and on the application test conditions (for example with an additional 1 pF cross capacitance between C2/C3 and C2/C7) it is possible that C2 is polluted with high frequency noise from C3. In this case, it will be necessary to connect a 220 pF capacitor between C2 and CGND . It is recommended to: 1. Keep track C3 as far as possible from other tracks 2. Have straight connection between CGND and C5 (the 2 capacitors on C1 should be connected to this ground track) 3. Avoid ground loops between CGND, PGND and GND 4. Decouple VDDP and VDD separately; if the 2 supplies are the same in the application, then they should be connected in star on the main track. With all these layout precautions, noise should be at an acceptable level, and jitter on C3 should be less than 100 ps. Refer to Application Note AN97036 for specimen layouts. Deactivation sequence When a session is completed, the microcontroller sets the CMDVCC line to the HIGH state. The circuit then executes an automatic deactivation sequence by counting the sequencer back and ends in the inactive state (see Fig.6): • RST goes LOW → (t11 =t10) • CLK is stopped LOW → (t12 =t11 + 1⁄2T); where T is approximately 25 µs • I/O, AUX1 and AUX2 are output into high-impedance state → (t13 =t11 + T) (10 kΩ pull-up resistor connected to VCC) • VCC falls to zero → (t14 =t11 + 1⁄23T); the deactivation sequence is completed when VCC reaches its inactive state • VUP falls to zero → (t15 =t11 + 5T) and all card contacts become low-impedance to GND; I/OUC, AUX1UC and AUX2UC remain pulled up to VDD via a 10 kΩ resistor. |
类似零件编号 - TDA8004 |
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类似说明 - TDA8004 |
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