73S8009CN-32IM/F Datasheet 73S8009CN-32IM/F | P16-P18

73S8009CN Data Sheet DS_8009CN_001

16 Rev. 1.4

3.2 Power Supply and Converter

The 73S8009CN power supply and converter circuitry takes power from the V

input pin. The power

supplied to V

pin is converted to the voltage V

utilizing an inductive, step-up converter. A series power

inductor (nominal value = 10µH) is connected from pin VPC to pin LIN, and a 10µF and a 0.1µF filter

capacitor must be connected to V

. Note: When the V

input voltage exceeds the nominal V

voltage

(approximately 5.5V), the switching operation of the converter stops and the converter acts as a pass

through for V

to V

. Switching operation will automatically resume when V

falls below the nominal V

voltage.

requires a 4.7µF filter capacitor and will have a nominal value of 5.5 volts during normal operation. V

is used by the smart card interface circuits (CLK, RST, I/O, AUX1, and AUX2) and is the source of the

regulated smart card supply V

. V

can be selected for values of 5V, 3V, and 1.8V.

The power supply output V

is also produced from V

. V

is used by the 73S8009CN circuit for logic,

input / output buffering with the host. In addition, V

can be used as a 3.3V regulated power supply for

some external circuitry provided that no more than 40mA is needed (simultaneously to the 65mA current

drawn from V

3.3 Interface Function - ON/OFF Modes

A power ON/OFF function is provided such that the circuit will be inoperative during the “OFF” state,

consuming minimum current from V

Option 1: 73S8009CN supplies host/system power controlled by push button ON/OFF switch:

Refer to Figure 3 for a typical electrical schematic when using an ON/OFF system switch.

The ON/OFF pin shall be connected to an SPST switch to ground. If the circuit is OFF and the switch is

closed for a de-bounce period of approximately 100ms, the circuit shall go into the “ON” state wherein all

functions are operating in normal fashion. If the circuit is in the “ON” state and the ON/OFF pin is

connected to ground for a period greater than the de-bounce period, OFF_REQ will be asserted high and

held regardless of the state of ON/OFF. Typically, the OFF_REQ signal is presented to a host controller

that will assert OFF_ACK high when it has completed all shutdown activities. When OFF_ACK is set

high, the circuit will de-activate the smart card interface if required and turn off all analog functions and

the V

supply for the logic and companion circuits. The OFF_ACK pin is connected internally to

OFF_REQ with a resistor such that if OFF_ACK is unconnected, the action of OFF_REQ will assert

OFF_ACK high. In this configuration, the circuit shall go into the “OFF” state immediately if the interface

is deactivated or immediately after deactivation if previously activated.. The default state upon application

of power to V

is the “OFF”. Note that at any time, the controller may assert OFF_ACK and the

73S8009CN will go into the “OFF” state (regardless of activity on the ON/OFF main system switch).

Option 2: ON/OFF status driven from the host processor (no system switch):

Refer to Figure 4 for a typical electrical schematic when controlling the ON/OFF pin via host control.

The ON/OFF pin can be connected to a host digital control signal to turn the 73S8009CN on or off. The

host should monitor the V

supply to determine when the switch debounce time has been achieved so

the 73S8009CN can switch states (ON or OFF). When the 73S8009CN is OFF, the host should drive the

ON/OFF pin low to initiate the turn ON process. The signal must remain low until the V

supply voltage

goes to 3.3V. The 73S8009CN is now ON and the ON/OFF pin should be driven back high. To turn off

the 73S8009CN, the host should drive the ON/OFF signal low until the V

supply goes to 0V. The

73S8009CN is now OFF and the ON/OFF pins should be driven back high. See Note 6.

DS_8009CN_026 73S8009CN Data Sheet

Rev. 1.4 17

Important Notes:

1. When the host is not powered by the V

supply of the 73S8009CN, special care must be taken

as the host signals going to the 73S8009CN can be active when the device is powered OFF.

This can create issues such as excessive current drain on the control signals and potentially

prohibit proper turn ON of the 73S8009CN. Series resistors on the input signals (except the

ON/OFF input) are recommended to provide isolation and prevent any potential problems.

The recommended value of these resistors is 47kΩ. It is also necessary for the host to set

these input signals to the low state (except for ON/OFF) when the 73S8009CN is OFF. False

activation of the card is possible if the

CMDVCC# or CMDVCC% inputs are low (with a card

inserted) when the 73S8009CN is powered ON. For this reason, the proper sequencing of the

73S8009CN is required. The

CMDVCC# or CMDVCC% inputs must be set high immediately

before the ON/OFF input is taken low to turn on the 73S8009CN. The time between setting the

CMDVCC# or CMDVCC% inputs high and the setting of the ON/OFF input set low should be

kept to a minimum as the

CMDVCC# or CMDVCC% inputs, when set high with the 73S8009CN

OFF, will draw significant current under these conditions. The 47kΩ series resistors will

mitigate this current draw. However, some additional current will be drawn through the

resistors to the

CMDVCC# or CMDVCC% inputs during this time so it should be kept to a

minimum.

2. For applications where ON/OFF is controlled by the host, the OFF_REQ and OFF_ACK signals do

not need to be connected to the host. When the OFF_ACK pin is left unconnected, the 73S8009CN

will turn off properly by the action of the internal resistor connection to OFF_REQ.

3. If the host is capable of selectively monitoring the I/O line, it can be used in place of the V

supply

monitor as it is tied to the V

supply through a pull up resistor when the smart card interface is not

activated.

4. When the 73S8009CN is powered OFF, the host will not be able to detect a card event (card

insertion/removal). If this function is necessary, then the host must monitor the card connector switch

separately.

5. For systems that do not use VDD to power the host controller, the host interface signals must operate

at 3.3V as the 73S8009CN digital logic operates off the V

(3.3V) supply regardless of the value of

the V

supply.

6. The ON/OFF pin is internally pulled up to V

through a 24kΩ resistor. Special care must be taken if

the host signal controlling the ON/OFF signal is running at a voltage different from V

. If this is the

case, then either the host control signal must be a maximum V

supply tolerant open drain output or

an external circuit should provide some isolation between the host control signal and the ON/OFF pin.

7. For those systems that require low power operation or are battery operated, the host controller circuit

firmware should place the 73S8009CN in the OFF state if no card activity is required.

73S8009CN Data Sheet DS_8009CN_026

18 Rev. 1.4

3.4 System Controller Interface

Five separate digital inputs and two outputs allow direct control of the card interface from the host:

 Pin CS: Chip select control.

 Pin CMDVCC# and/or CMDVCC%: When low, starts an activation sequence.

 Pin RSTIN: controls the card RST signal.

 Pin SC/USB: Routes AUXx signals to AUXxUC or USB Dx pins and provides proper tri-stating

functionality.

 Pin RDY: Indicates when smart card power supply is stable and ready.

 Pin OFF: Indicator of card presence and any card fault conditions.

Interrupt output to the host: When the card is not activated, the OFF pin informs the host about the card

presence only (Low = No card in the reader, high = card inserted). When CMDVCC (#/% signals) is/are

set low (card activation sequence requested from the host), low level on OFF means a fault has been

detected (e.g. card removal during card session, or voltage fault, or thermal / over-current fault) that

automatically initiates a deactivation sequence. The smart card pass through signals are enabled when

the RDY conditions are met.

3.5 Card Power Supply and Voltage Supervision

The 73S8009CN smart card interface IC incorporates an LDO voltage regulator for the card power

supply, V

to V

conversion uses an internal LDO). The voltage output is controlled by the digital

input sequence of CMDVCC# and CMDVCC%. This regulator is able to provide either 1.8V, 3V or 5V

card voltage sourced from the V

power supply. Internal digital circuitry is also powered by the V

power

supply (except for the ON/OFF circuitry which is powered from V

). A voltage supervisor checks the

value of the voltage V

. A card deactivation sequence is forced upon fault detected by voltage

supervisor, overcurrent condition, or card removal event. The voltage regulator can provide a card

current of 65mA in compliance with EMV 4.1 for 3-V and 5-V cards. The signals CMDVCC# and

CMDVCC% control the turn-on, output voltage value, and turn-off of V

. When either signal is asserted

low, V

will ramp to the selected value or if both signals are asserted low (within 400ns of each other),

will ramp to 1.8V. These signals are edge triggered. If CMDVCC% is asserted low (to command V

to be 5V) and at a much later time (greater than 2µs, typically), CMDVCC# is asserted low, it will be

ignored (and vice versa.)

At the assertion (low) of either or both CMDVCC (#/% signals), V

will rise to the requested value. When

rises to an acceptable value, and stays above that value for approximately 20µs, RDY will be set

high. Approximately 510µs after the fall of CMDVCC (#/%), the circuit will check the see if V

is at or

above the required minimum value (indicated by RDY=1) and if not, will begin an emergency deactivation

sequence. During the 510µs time, card removal, or de-assertion of CMDVCC (#/%) shall also initiate an

emergency deactivation sequence. The circuit provides over-current protection and limits Icc to 150mA,

maximum for self-protection. When an over-current condition is sensed, the circuit will invoke a de-

activation sequence.

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73S8009CN-32IM/F

Mfr. #:

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Manufacturer:

Maxim Integrated

Description:

I/O Controller Interface IC ISO7816 & USB Unvrsl Smart Card Interface

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