DS8113-RNG+ datasheet(15/17 Pages) MAXIM

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Smart Card Power Select

The DS8113 supports three smart card VCC voltages:

1.8V, 3V, and 5V. The power select is controlled by the

1_8V and 5V/3V signals as shown in Table 3. The 1_8V

signal has priority over 5V/3V. When 1_8V is asserted

high, 1.8V is applied to VCC when the smart card is

active. When 1_8V is deasserted, 5V/3V dictates VCC

power range. VCC is 5V if 5V/3V is asserted to a logic-

high state, and VCC is 3V if 5V/3V is pulled to a

logic-low state. Care must be exercised when switching

from one VCC power selection to the other. If both 1_8V

and 5V/3V are high with CMDVCC high at the same

time, the DS8113 enters stop mode. To avoid acciden-

tal entry into stop mode, the state of 1_8V and 5V/3V

must not be changed simultaneously. A minimum delay

of 100ns should be observed between changing the

states of 1_8V and 5V/3V. See Figure 9 for the recom-

mended sequence of changing the VCC range.

Smart Card Interface

______________________________________________________________________________________

VCC SELECT

STOP MODE

1.8V

1_8V

5V/3V

CMDVCC

Figure 9. Smart Card Power Select

Table 3. VCC Select and Operation Mode

1_8V

5V/3V

CMDVCC

VCC SELECT (V)

CARD INTERFACE STATUS

Activated

Inactivated

Activated

Inactivated

1.8

Activated

1.8

Inactivated

1.8

Reserved (Activated)

1.8

Not Applicable—Stop Mode

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