MLX90121 Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90121

13.56MHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90121

13.56MHz RFID Transceiver

Example in ISO15693-Single Sub-carrier

Input Signal

DOUT

CK

MV start

LTC

LTCDelay

11.4. Power Modes

This chip has three power modes. To select one of these modes write the PowerState parameter in the

PowerState register.

PowerState

00

01

11

Power Mode

Low Power

Transmitter On

Power Down

Symbol

Idle

Itr

Istb

Power Down

If the Power Down mode is selected, the crystal oscillator will be turned off. Therefore, it will be impossible

to write the PowerState register to wake up the chip. To wake up the chip, it is necessary to send a falling

edge on CK when DIN is low. During Power Down mode, keep DIN high to avoid glitches on CK.

MODE

CK

DIN

PowerDown

Wake-up

PowerOn

Notes

• After a wake-up, the chip has to be set in Transmitter On or Low Power mode by updating the

PowerState register, after Tstart.

Low Power

The oscillator is still on but all analog circuitry is off.

11.5. BUF Output

The XBUF pin can be used to clock a device or a microcontroller. By default the output is enabled with a

frequency of 6.78MHz. The frequency can be doubled to 13.56MHz by setting the bit XBUFSel. When the

output is not used, it is recommended to disable the clock by setting the bit XBUFEnB.

3901090121

Rev. 009

Page 18 of 26

Data Sheet

Sept.-2009

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