MC33560 데이터 시트보기 (PDF) - ON Semiconductor

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MC33560

Power Management and Interface IC for Smartcard Readers and Couplers

ON Semiconductor 

MC33560

CS: FALLING EDGE

STAND BY MODE

CS = H

PWRON = L

ACTIVE MODE

CS = L

PWRON = L

RDYMOD: 0 AND

CS: FALLING EDGE

CS: RISING EDGE

CS: 1 AND

RDYMOD: RISING EDGE

CS: 0 AND

PWRON: RISING EDGE

ISO START SEQUENCE

ISO STOP SEQUENCE

ERROR

CONDITION

IDLE MODE

CS = H

PWRON = H

PWRON: FALLING EDGE

OR ERROR CONDITION

CS: 1 AND

RDYMOD: RISING EDGE

RDYMOD: 0 AND

CS: FALLING EDGE

PROGRAMMING MODE

CS = L

RDYMOD = L

TRANSACTION MODE

CS = L

PWRON = H

Figure 21. MC33560 Operating Modes

PROGRAMMING MODE

CS = L

RDYMOD = L

OPERATING MODES

The MC33560 has five operating modes:

• Standby

• Programming

• Active

• Transaction

• Idle

The transitions between these different states are shown in

Figure 21 above.

STANDBY MODE

Standby mode allows the MC33560 to detect card

insertion and monitor the power supply while keeping the

power consumption at a minimum. It is obtained with

CS = H and PWRON = L.

When the MC33560 detects a card, INT is asserted low to

wake up the Microcontroller.

PROGRAMMING MODE

The programming mode allows the user to configure the

card VCC and the card clock signal for his specific

application. The card supply, CRDVCC, can be programmed

to 3 V or 5 V, and the card clock signal can be defined to be

either synchronous, or asynchronous divided by 1, 2 or 4.

Programming mode is obtained with RDYMOD = L

followed by a negative transition on CS. The programming

options are shown in Table 3. Programmed values are

latched on a positive transition of CS with RDYMOD = L.

ACTIVE MODE

In active mode, the MC33560 is selected, the RDYMOD

pin becomes an output, and the MC33560 status can be

polled. Power is not applied to the card.

The microcontroller polls the MC33560 by asserting

CS = L and reading the RDYMOD pin.

If a card is present, the microcontroller starts the DC−DC

converter by asserting PWRON=H. This starts the

automatic power on sequence: when CRDVCC reaches the

undervoltage level (VT5H or VT3H, depending on

programming), the card sequencer validates CRDIO,

CRDRST, CRDCLK, CRDC4, CRDC8 pins according to

the ISO7816−3 sequence (Figure 26). The MC33560 is now

in transaction mode, and the system is ready for data

exchange via the three I/O lines and the RESET line.

TRANSACTION MODE

In transaction mode, the MC33560 maintains power and

the selected clock signal applied to the card, and the levels

of the I/O, RESET, C4 and C8 signals between the

microcontroller and the card are translated depending on the

supply voltages VBAT and VCC.

The DC−DC converter status can be monitored on the

RDYMOD pin.

IDLE MODE

Idle mode is used when maintaining a card powered up

without communicating with it. When an asynchronous

clock is used, the selected clock signal is applied to the card.

POWERDOWN OPERATION

Powerdown can be initiated by the controlling

microprocessor, by stopping the DC−DC converter with

PWRON = L while CS = L, or by the MC33560 itself when

an error condition has been detected (CRDVCC

undervoltage, overcurrent longer than 160 ms typ.,

overtemperature, “hot” card extraction). The

communication session is terminated in a given sequence

defined in ISO7816−3.

The MC33560 then goes into active mode, in which its

status can be polled.

Standby mode is reached by deselecting the MC33560

(CS = H).

FUNCTIONAL BLOCKS

CARD DETECTOR

This block monitors the card contact CRDDET (during

insertion and extraction), filters the incoming waveform and

generates an interrupt signal INT after each change. In order

to identify which coupler activated the INT line

(multicoupler application) the microcontroller scans both

circuits via CS and reads the RDYMOD pin.

The programming input CRDCON tells the level detector

which type of mechanical contact is implemented (normally

open or normally closed). Special care is taken to hold the

current consumption very low on this part of the circuit

which is continuously powered by the VBAT supply.

The CRDDET pin has high impedance input, and an

external resistor must be connected to pullup or pulldown,

depending on CRDCON. This resistor is chosen according to

the maximum leakage current of the card connector and the

PCB.

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