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参数资料
| 型号： | 935262073551 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | PLASTIC, QFP-64 |
| 文件页数： | 18/43页 |
| 文件大小： | 206K |
| 代理商： | 935262073551 |
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2000 Feb 21
25
Philips Semiconductors
Product specication
Multiprotocol IC Card coupler
TDA8006
Deactivation sequence
When the session has completed, the microcontroller sets
CMDVCC LOW (t10). The circuit then executes an
automatic deactivation sequence:
Card reset (RST goes LOW) (t11)
Clock is stopped (t12)
I/O goes LOW (t13)
VCC falls to 0 V with typically 0.16 V/s slew rate (t14)
The step-up converter is stopped and CLK, RST, VCC
and I/O become low impedance to GND (t15).
t11 =t10 + 164T, t12 =t11 + 12T, t13 =t11 +T,
t14 =t11 + 32T, t15 =t11 + 5T.
tde is the time that VCC requires to fall to less than 0.3 V.
handbook, full pagewidth
MGR237
CMDVCC
RST
I/O
VCC
CLK
VUP
t10
t11
t12
t13
t14
t15
tde
Fig.13 Deactivation sequence.
Protection
The main hardware fault conditions monitored by the
circuit are:
Overcurrent on VCC
Short circuits between VCC and other contacts
Card take-off during transaction.
When one of these problems is detected, the security logic
block sets the OFF bit LOW which generates an interrupt
warning the microcontroller and initiates an automatic
deactivation of the contacts.
When the deactivation has completed and CMDVCC has
been set LOW, the OFF bit goes HIGH, unless the problem
was caused by a card extraction, in which case it remains
LOW until a card is inserted.
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