DEMO90121DA Melexis Inc, DEMO90121DA Datasheet - Page 18

• Manufacturer Part Number: DEMO90121DA
• Description: KIT DEMO RFID DOOR ACCESS
• Manufacturer: Melexis Inc
• Type: RFID (Radio Frequency Identification)r

Specifications of DEMO90121DA

• Contents: Reader Board, Antenna Board, 3 tag cards, Battery, Battery cable, Software and Documentation
• For Use With/related Products: MLX90121
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Example in ISO15693-Single Sub-carrier
11.4. Power Modes
This chip has three power modes. To select one of these modes write the PowerState parameter in the
PowerState register
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.
Notes
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
After a wake-up, the chip has to be set in Transmitter On or Low Power mode by updating the
PowerState register, after T
.
MODE
DIN
CK
PowerDown
Input Signal
LTCDelay
MV start
DOUT
LTC
CK
start
.
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13.56MHz RFID Transceiver
Wake-up
MLX90121
PowerOn
Data Sheet
Sept.-2009