DS8007 Maxim, DS8007 Datasheet - Page 29

• Manufacturer Part Number: DS8007
• Description: The DS8007 multiprotocol dual smart card interface is a low-cost, dual smart card reader interface supporting all ISO 7816, EMV®, and GSM11-11 requirements
• Manufacturer: Maxim

The host device can request a deactivation sequence
by resetting the START bit to 0 for the desired card
interface. The deactivation (from the deassertion of the
START bit, step 1 of the deactivation sequence, to
V
An emergency deactivation occurs if unsatisfactory
operating conditions are detected. An emergency deac-
tivation occurs for all activated cards in response to a
supply-voltage brownout condition (as reported by the
HSR.SUPL bit) or chip overheating (as reported by
HSR.PTL). Emergency deactivation of an individual card
can occur if a short-circuit condition is detected on the
associated V
HSR.PRTLx) or in the case of a card takeoff (as reported
by HSR.PRLx). When an emergency deactivation occurs,
hardware automatically forces the associated START
bit(s) to the 0 state. The response of the device to the
emergency deactivation varies according to the source.
If the RSTx pin is shorted or the device overheats, the
sequencer executes a fast emergency deactivation
sequence, which ramps down V
Figure 10. Interrupt Sources
CCx
decrease to less than 0.4V) is less than 150µs.
UCR2AUX.DISTBE/RBF
UCR2A.DISTBE/RBF
UCR2B.DISTBE/RBF
UCR2AUX.DISAUX
UCR2A.DISAUX
UCR2B.DISAUX
HSR.INTAUXL
USR.TBE/RBF
HSR.PRTLA
HSR.PRTLB
HSR.PRLB
HSR.PRLA
HSR.SUPL
USR.TO3
USR.TO2
USR.TO1
USR.OVR
HSR.PTL
USR.FER
USR.EA
USR.PE
CCx
Deactivation Sequencing
______________________________________________________________________________________
Multiprotocol Dual Smart Card Interface
or RSTx pin (as reported by
SCA, SCB, SCAUX
SCA, SCB, SCAUX
Emergency Deactivation
CCx
immediately.
If the V
deactivation sequence in same way as if the START bit
was cleared to 0.
The INT output pin signals the host device that an event
occurred that may require attention. The assertion of
the INT pin is a function of the following sources:
• A fault has been detected on card interfaces
• V
• A reset is caused by externally driving the DELAY
• Excessive heating is detected (i.e., PTL = 1).
• A level change has been detected on pin PRESx or
• The parity and/or frame error is detected.
• The early answer (EA) bit is set during ATR.
• The timeout counter(s) reach their terminal
• The FIFO full status is reached.
• The FIFO overrun occurs.
• The transmit buffer is empty.
(A or B).
pin to less than 1.25V.
INTAUX for the card interfaces (A, B, or AUX).
count(s).
DD
CCx
has dropped below the acceptable level.
pin was shorted, the sequencer executes a
Interrupt Generation
INT OUTPUT PIN
GENERATION
INTERRUPT
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