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TDA8002 数据表(PDF) 9 Page - NXP Semiconductors |
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TDA8002 数据表(HTML) 9 Page - NXP Semiconductors |
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9 / 28 page  1997 Nov 04 9 Philips Semiconductors Product specification IC card interface TDA8002 Logic circuitry After power-up, the circuit has six possible states of operation. Table 1 shows the sequence of these states. IDLE MODE After reset, the circuit enters the idle mode. A minimum number of functions in the circuit are active while waiting for the microcontroller to start a session: • All card contacts are inactive • I/OUC, AUX1UC and AUX2UC are high-impedance • Oscillator XTAL runs, delivering CLKOUT • Voltage supervisor is active. LOW-POWER (SLEEP) MODE When pin MODE goes LOW, the circuit enters the low-power (sleep) mode. As long as pin MODE is LOW, no activation is possible. If pin MODE goes LOW in the active mode, a normal deactivation sequence is performed before entering low-power mode. When pin MODE goes HIGH, the circuit enters normal operation after a delay of at least 6 ms (96 cycles of CLKOUT). During this time the CLKOUT remains at 16 kHz. • All card contacts are inactive • Oscillator XTAL does not run • The VDD supervisor, ALARM output, card presence detection and OFF output remain functional • Internal oscillator is slowed to 32 kHz, CLKOUT providing 16 kHz. ACTIVE MODE When the activation sequence is completed, the TDA8002 will be in the active mode. Data is exchanged between the card and the microcontroller via the I/O lines. State diagram Fig.7 State diagram. handbook, full pagewidth MGE735 POWER OFF ACTIVE MODE LOW-POWER MODE IDLE MODE FAULT ACTIVATION DEACTIVATION |
类似零件编号 - TDA8002 |
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类似说明 - TDA8002 |
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