DS8113 Maxim, DS8113 Datasheet - Page 14

• Manufacturer Part Number: DS8113
• Description: The DS8113 smart card interface is a low-cost, analog front-end for a smart card reader, designed for all ISO 7816, EMV™, and GSM11-11 applications
• Manufacturer: Maxim

Smart Card Interface
A low-power state, stop mode, can be entered by forc-
ing the CMDVCC, 5V/3V, and 1_8V input pins to a
logic-high state. Stop mode can only be entered when
the smart card interface is inactive. In stop mode all
internal analog circuits are disabled. The OFF pin fol-
lows the status of the PRES pin. To exit stop mode,
change the state of one or more of the three control
Figure 8. Stop-Mode Sequence
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STOP MODE
Stop Mode (Low-Power Mode)
CMDVCC
5V/3V
1_8V
PRES
VCC
OFF
DEACTIVATE INTERFACE
PRES IN STOP MODE
OFF FOLLOWS
STOP MODE
ACTIVATE
pins to a logic-low. An internal 220µs (typ) power-up
delay and the 8ms PRES debounce delay are in effect
and OFF is asserted to allow the internal circuitry to sta-
bilize. This prevents smart card access from occurring
after leaving the stop mode. Figure 8 shows the control
sequence for entering and exiting stop mode. Note that
an in-progress deactivation sequence always finishes
before the DS8113 enters low-power stop mode.
220μs DELAY
DEACTIVATE
STOP MODE
OFF ASSERTED TO
WAIT FOR DELAY
8ms DEBOUNCE