DS8005(2010) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS8005
(Rev.:2010)

Smart Card Interface

Maxim Integrated 

Smart Card Interface

Stop Mode (Low-Power Mode)

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

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 occur-

ring 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

DEACTIVATE

STOP MODE

220μs DELAY

8ms DEBOUNCE

OFF_ ASSERTED TO

WAIT FOR DELAY

VCC_

Figure 8. Stop-Mode Sequence

______________________________________________________________________________________ 15

Share Link: