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MLX90132 Datasheet, PDF (27/44 Pages) Melexis Microelectronic Systems – 13.56MHz RFID / NFC Transceiver
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MLX90132
13.56MHz RFID / NFC Transceiver
Meaning of Wake-up settings <WUFlags>
A Register
Bit
7:6 – LfoPresc
Function
LFO prescaler. Divides LFO for state machine.
00 – 32 KHz
01 – 16 KHz
10 – 8 KHz
11 – 4 KHz
2 WUFlags
5 – RFU, set to ‘0’
Specifies the possible source on which to exit from idle mode, incase SLEEP
state is selected. Each bit corresponds to one wake-up source which is
updated and returned when the MLX90132 leaves the Idle routine without error
4:0 – WUFlags
bit4 - Low level on SPI_NSS
bit3 – Low level on IRQ_IN, must be set to ‘1’
bit2 – Field Detector
bit1 – TAG Detector
bit0 – WakeUp(WU at the end of MaxSleep cycles even if no event detected)
Table 24: Field <WUFlags> definition in “Idle” command
Meaning of power settings <EnterCtrlH:EnterCtrlL>, <WUCtrlH:WUCtrlL> and <LeaveCtrlH:LeaveCtrlL>
A Register
Comment
7 – Initial DAC compare index (‘0’ = DacDataL, ‘1’ = DacDataH used for the 1st comparison)
6 – RFU, must be set to ‘0’
5 – LFO enable(needs to be set to ‘1’ in WUCtrl)
0 CtrlL
4 – HFO enable (needs to be set to ‘1’ in WUCtrl)
3 – VDDA enable (needs to be set to use HFO, see recommended values in Table 23 above)
2 – Hibernate state enable
1 – RFU
0 – Sleep state enable
7:2 – RFU, must be set to ‘0’
1 CtrlH
1 – Field detector enable
0 – IREF (needs to be set to ‘1’ in WUCtrl, otherwise must be put to ‘0’)
Table 25: Fields <EnterCtrl>, <WUCtrl> and <LeaveCtrl> definition in “Idle” command
Notes:
 The bytes <EnterCtrl> define the configuration when entering the IDLE mode. The bytes <WUCtrl> define
the configuration when the device wakes-up from the IDLE mode (recommended value 0x3801). The
bytes <LeaveCtrl> define the configuration when leaving the IDLE mode, after wake-up.
 The Hibernate state is entered by setting the “Hibernate state enable” flag to ‘1’ and the Sleep state is
entered by setting the “sleep state enable” flag to ‘1’, both in the WUFlags register.
Equation 1: Sleep period
Equation 2: HF ON period
Equation 3: Duration before Timeout
With:
(
)
(
)(
)
and
[s]
3901090132
Rev. 009
Page 27 of 44
Jan-2014
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