Melexis MLX90130, Manual

Page: 22 / 37

MLX90130
13.56MHz RFID Transceiver
3901090130 Page 22 of 37 Jan-2014
Rev. 004
Meaning of Wake-up settings < WUFlags >
A Register Bit Function
2 WUFlags
7:6 – LfoPresc
LFO prescaler. Divides LFO for state machine.
00 – 32 KHz
01 – 16 KHz
10 – 8 KHz
11 – 4 KHz
5 – RFU, set to ‘0’
4:0 – WUFlags
Specifies the possible source on which to exit from idle mode, in case SLEEP
state is selected. Each bit corresponds to one wake-up source which is
updated and returned when the MLX90130 leaves the Idle routine without error
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 17: Field <WUFlags> definition in “ Idle ” command
Meaning of power settings < EnterCtrlH:EnterCtrlL >, < WUCtrlH:WUCtrlL > and < LeaveCtrlH:LeaveCtrlL >
A Register Comment
0 CtrlL
7 – Initial DAC compare index (‘0’ = DacDataL, ‘1’ = DacDataH used for the 1
st
comparison)
6 – RFU, must be set to ‘0’
5 – LFO enable (needs to be set to ‘1’ in WUCtrl)
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 16 above)
2 – Hibernate state enable
1 – RFU
0 – Sleep state enable
1 CtrlH
7:2 – RFU, must be set to ‘0’
1 – Field detector enable
0 – IREF (needs to be set to ‘1’ in WUCtrl, otherwise must be put to ‘0’)
Table 18: 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]