參數(shù)資料
型號(hào)： TDA8020HL/C1
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-358-1, LQFP-32
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 137K
代理商： TDA8020HL/C1
2003 Nov 06
13
Philips Semiconductors
Product specication
Dual IC card interface
TDA8020HL
Deactivation sequence
When the session is completed, the microcontroller resets bit START/STOP to logic 0 (t10). The circuit then executes an
automatic deactivation sequence (see Fig.5):
1. Card reset (RST falls LOW) (t11)
2. Clock is stopped (t12)
3. I/O falls to 0 V (t13)
4. VCC falls to 0 V with a controlled slew rate (t14)
5. The DC-to-DC converter is stopped (if both cards are inactive) and CLK, RST, VCC and I/O become low impedance
to CGND (t15)
6. The internal oscillator changes to its low frequency if both cards are inactive (t15).
t11 = t10 + T/64; t12 = t11 + T/2; t13 = t11 + T; t14 = t11 + 3T/2; t15 = t11 + 7T/2.
The deactivation time tde is the time that VCC needs to drop below 0.4 V from START/STOP to logic 0 (t10).
VUP
VCC
I/O
CLK
RST
handbook, full pagewidth
START/STOP
t0 t1
t2
t3
t4
t5
FCE837
ATR
Fig.4 Activation sequence.
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