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參數(shù)資料
| 型號： | LTC1756 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Smart Card Interface |
| 中文描述： | 智能卡接口 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 149K |
| 代理商： | LTC1756 |
8
LTC1756
APPLICATIO
S I
N
FOR
ATIO
U
The bypass capacitor at V
IN
is also important. Large dips
on the input supply due to ESR may cause problems with
the internal circuitry of the LTC1756. A good choice for the
input bypass capacitor is a 10
μ
F Y5V style ceramic
W
U
Low Power Operation
The LTC1756 is inherently a low power device. When there
is no Smart Card present the supply current is less than
2.5
μ
A. When a Smart Card is present the LTC1756 oper-
ates with a quiescent current of only 75
μ
A, thus the
majority of power is consumed by charge pump losses
and the card itself. If the card can be made to consume less
power during idle times a significant power savings will be
achieved. Whenever possible Clock Stop Mode should be
used (or alternatively a very low “idling” clock speed).
Furthermore, in the Active state, the bidirectional pins
should all be relinquished whenever possible since there
is some static current flow when a bidirectional pin is
pulled down.
Overtemperature Fault Protection
An overtemperature circuit disables the chip and places
the LTC1765 in the Alarm state if the IC’s junction tem-
perature exceeds 150
°
C.
Dynamic Pull-Up Current Sources
The current sources on the bidirectional pins (DATA and
I/O) are dynamically activated to achieve a fast rise time
with a relatively small static current (Figure 1). Once a
bidirectional pin is relinquished, a small start-up current
begins to charge the node. An edge rate detector deter-
mines if the pin is released by comparing its slew rate with
an internal reference value. If a valid transition is detected,
a large pull-up current enhances the edge rate on the node.
The higher slew rate corroborates the decision to charge
the node thereby effecting a dynamic form of hysteresis.
Once the node has reached the power supply voltage the
internal comparator requires several hundred nanosec-
onds to reset. Pulling down on the pin before the reset
delay expires will result in a momentary contention and a
higher current flow. Therefore, the comparator delay sets
the upper limit on the maximum data rate of the bidirec-
tional channels to about 500kHz.
Figure 1. Dynamic Pull-Up Current Sources
–
+
δ
V
δ
t
I
START
1756 F01
V
REF
BIDIRECTIONAL PIN
V
CC
OR V
IN
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