DS8005 查看數據表（PDF） - Maxim Integrated

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DS8005

Smart Card Interface

Maxim Integrated 

DS8005

Smart Card Interface

Stop Mode (Low-Power Mode)

A low-power state, stop mode, can be entered by forcing

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 follows the status of

the PRES_ pin. To exit stop mode, change the state of

one or more of the three control 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 stabilize. This prevents smart

card access from occurring after leaving 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 device enters low-

power stop mode.

DEACTIVATE INTERFACE

CMDVCC

1_8V

5V/3V

ACTIVATE

STOP MODE

STOP MODE

OFF_

PRES_

OFF_ FOLLOWS

PRES IN STOP MODE

VCC_

Figure 8. Stop-Mode Sequence

DEACTIVATE

STOP MODE

220µs DELAY

8ms DEBOUNCE

OFF_ ASSERTED TO

WAIT FOR DELAY

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