Rainbow-electronics DS8314 Manual de usuario descargar pdf (Pagina 15)

Smart Card Power Select

The DS8313/DS8314 support three smart card V

voltages: 1.8V, 3V, and 5V. The power select is con-

trolled 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 V

when the

smart card is active. When 1_8V is deasserted, 5V/3V

dictates V

power range. V

is 5V if 5V/3V is assert-

ed to a logic-high state, and V

is 3V if 5V/3V is pulled

to a logic-low state. Care must be exercised when

switching from one V

power selection to the other. If

both 1_8V and 5V/3V are high with CMDVCC high at

the same time, the DS8313/DS8314 enter stop mode.

To avoid accidental 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 recommended sequence of changing

the V

range.

DS8313/DS8314

Smart Card Interface

______________________________________________________________________________________ 15

SELECT STOP MODE1.8V 1.8V3V 3V5V

1_8V

5V/3V

CMDVCC

Figure 9. Smart Card Power Select

Table 3. V

Select and Operation Mode

1_8V 5V/3V CMDVCC V

SELECT (V) CARD INTERFACE STATUS

0 0 0 3 Activated

0 0 1 3 Inactivated

0 1 0 5 Activated

0 1 1 5 Inactivated

1 0 0 1.8 Activated

1 0 1 1.8 Inactivated

1 1 0 1.8 Reserved (Activated)

1 1 1 1.8 Not Applicable—Stop Mode

1 2 ... 10 11 12 13 14 15 16 17

DS8313/DS8314 1
Smart Card Interface 1

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Rainbow-electronics DS8314 Manual de usuario Pagina 15

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