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ST8034P 数据表(PDF) 27 Page - STMicroelectronics

部件名 ST8034P
功能描述  16-pin smartcard interfaces
PDF  39 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST8034P 数据表(HTML) 27 Page - STMicroelectronics

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Functional description
ST8034T, ST8034AT, ST8034P, ST8034C
28/40
DocID024587 Rev 4
6.7
Deactivation sequence
When a session ends, the microcontroller sets CMDVCC high. The ST8034 device then
executes an automatic deactivation sequence by counting the sequencer back to the
inactive state (see Figure 13):
1.
RST goes low (t11).
2.
The clock is stopped, CLK is low (t12).
3.
I/O is pulled low (t13).
4.
VCC falls to 0 V (t14). The deactivation sequence is completed when VCC reaches its
inactive state.
5.
VCC < 0.4 V (tDEACT).
6.
All card contacts become low impedance to GND. The I/OUC pin remains pulled up to
VDD(INTF) by the internal 10 k pull-up resistor.
7.
The internal oscillator returns to its low frequency mode.
Time delays
t11 = t10 + 3T / 64
t12 = t11 + T / 2
t13 = t11 + T
t14 = t11 + 3T / 2
tDEACT = t11 + 3T / 2 + VCC fall time.
T = 64 x 1/fOSC(INT)
Figure 13. Deactivation sequence



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