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TDA8002BT Folha de dados(PDF) 10 Page - NXP Semiconductors |
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TDA8002BT Folha de dados(HTML) 10 Page - NXP Semiconductors |
10 / 28 page 1997 Nov 04 10 Philips Semiconductors Product specification IC card interface TDA8002 ACTIVATION SEQUENCE From idle mode, the circuit enters the activation mode when the microcontroller sets the CMDVCC line LOW or sets the MODE line HIGH when the CMDVCC line is already LOW. The internal circuitry is then activated, the internal clock is activated and an activation sequence is executed. When RST is enabled, it becomes the inverse of RSTIN. Figures 8 to 10 illustrate the activation sequence as described below: 1. Step-up converter is started (t1 ≈ t0) 2. VCC rises from 0 to 5 V (t2 =t1 +11⁄2T) 3. I/O, AUX1, AUX2 are enabled and CLK is enabled (t3 =t1 + 4T); a special circuitry ensures that I/O remains below VCC during falling slope of VCC 4. CLK is set by setting RSTIN to HIGH (t4) 5. RST is enabled (t5 =t1 + 7T); after t5, RSTIN has no further action on CLK, but is only controlling RST. Fig.8 Activation sequence using RSTIN and CMDVCC. handbook, full pagewidth MGE736 OSC_INT/64 CMDVCC VUP VCC I/O CLK RSTIN RST high - Z tact t0 t1 t2 t3 t4 t5 T = 25 µs |
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