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LTC1755 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC1755
Description  Smart Card Interface
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1755 Datasheet(HTML) 10 Page - Linear Technology

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LTC1755
APPLICATIONS INFORMATION
Figure 4. LTC1755 State Diagram
DEACTIVATION
NO
FAULT
FAULT
1755 F04
POWER OFF
IDLE
DEACTIVATION
ALARM
ACTIVE
FAULT
TIMEOUT
PWR = DVCC
PWR = DVCC
PWR = 0V
PRES
≠ NC/NO
FAULT > 5
µs
or
PRES
≠ NC/NO
ALARM/DEACTIVATION
Same as Idle/Deactivation except:
ALARM = L
The only possible next state is Idle/Deactivation which is
achieved by disabling the LTC1755 via the PWR pin
(i.e., PWR = DVCC).
The alarm indication can be cleared by rapidly cycling the
PWR pin. However, a new activation cycle will not begin
until VCC is or has dropped below approximately 1V.
ACTIVE
VCC = 3V or 5V (as determined by the 5V/3V pin)
RST = RIN, CLK = CIN
I/O, AUX2, AUX1, DATA, AUX2IN, AUX1IN = Ready for
data (after READY becomes low)
CARD = PRES
⊕ NC/NO
ALARM = H
FAULT TIMEOUT
Same as Active except:
The duration of a fault is being measured. If the fault
duration exceeds 5
µs then the Alarm/Deactivation state
follows. If the fault duration is less than 5
µs, then the
device is returned to the Active state.
State Definitions
IDLE/DEACTIVATION
VCC, RST, CLK, I/O AUX2, AUX1 = L
READY, ALARM, DATA, AUX2IN, AUX1IN = Z
CARD = PRES
⊕ NC/NO
Once the LTC1755 enters the Idle/Deactivation state the
deactivation sequence begins. The deactivation sequence
will continue until VCC is discharged to approximately 1V.
An activation command (PWR = 0V) will only be acknowl-
edged once this occurs.


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