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參數(shù)資料
| 型號： | 8XC51FB |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low power single card reader |
| 中文描述： | 低功耗單卡讀卡器 |
| 文件頁數(shù)： | 46/58頁 |
| 文件大小： | 233K |
| 代理商： | 8XC51FB |
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2003 Oct 30
46
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
8.17
Deactivation sequence
When the session is completed, the microcontroller resets
bit START (t
10
). The circuit then executes an automatic
deactivation sequence shown in Fig.13:
Card reset (pin RST falls LOW) (t
11
)
Clock (pin CLK) is stopped LOW (t
12
)
Pin I/O falls to 0 V (t
13
)
V
CC
falls to 0 V with typical 0.17 V/
μ
s slew rate (t
14
)
The DC/DC converter is stopped and CLK, RST, V
CC
and I/O become low impedance to GNDC (t
15
).
t
11
= t
10
+
3
/
64
T, t
12
= t
11
+
1
/
2
T, t
13
= t
11
+ T,
t
14
= t
11
+
3
/
2
T, t
15
= t
11
+
7
/
2
T.
t
de
is the time that V
CC
needs for going down to less than
0.4 V.
Automatic emergency deactivation is performed in the
following cases:
Withdrawal of the card (PRES LOW)
Overcurrent detection on V
CC
(bit PRTL1 set)
Overcurrent detection on RST (bit PRTL1 set)
Overheating (bit PTL set)
Supply too low (bit SUPL set)
RESET pin active HIGH.
If the reason of the deactivation is a card take off, an
overcurrent or an overheating, then INT0_N is LOW. The
corresponding bit in the hardware status register is set. Bit
START is automatically reset.
If the reason is a supply dropout, then the deactivation
sequence occurs, and a complete reset of the chip is
performed. When the supply will be OK again, then the bit
SUPL will be set in HSR.
handbook, full pagewidth
START
VUP
VCC
I/O
CLK
RST
t10
t12
t13
tde
t14
t15
t11
FCE685
Fig.13 Deactivation sequence.
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