MLX90129 Просмотр технического описания (PDF) - Melexis Microelectronic Systems
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MLX90129 Datasheet PDF : 60 Pages
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MLX90129
13.56MHZ SENSOR TAG / DATALOGGER IC
7.3.1. EE-Latches
Another kind of non-volatile memory is used to store the trimming / configuration bits that should be immediately available: the
EE-Latch bank. They are mainly used for the trimming of the oscillators and the capacitance of the antenna, for security and
power management.
/!\ It is important to read its value before re-programming it, in order to not erase some trimming bits.
EE-Latches map: (Internal Devices Domain, Address #03, #04 and #09, read/write)
Bits Name
Description (when the bit is asserted high)
#03 - EE-Latches word 0
4:0 LFO_Freq_Trim (Trimming bits)
6:5 Bias_Cur_Trim (Trimming bits)
7
DisableAutoLoading
10:8
13:11
14
HFO_Freq_Trim (Trimming bits)
VReg_Trim (Trimming bits)
RCb_Quartz
15 Disconnect_Vfield_Vbat
(used by Melexis)
(used by Melexis)
Disables the automatic loading of the Register File with its
image from the EEPROM after a power-on reset from the
battery
(used by Melexis)
(used by Melexis)
Selects the low-frequency RC-oscillator LFO (=0) or the quartz-
oscillator XLFO (=1)
Disconnects the pads VFIELD and VBAT, when not using the
energy from the field to supply the whole device.
#04 - EE-Latches word 1
1:0 Mod_Res
2
VReg_Dis
11: default modulator resistance
Disables the VReg regulator and shorts-cut its output to Vbat
3
VReg_LV
Low-voltage option for the VREG regulator and the sensor
regulator
7:4 Reserved
(Must be 0)
14:8
RFID_EEPROM_Lock_Map**
Map of pages in EEPROM, to be locked for RFID write, using the
“Lock” command
15 RFID_Device_Lock**
Locks the RFID device
#09 - CTC code
4:0 CTC_Trim (Trimming bits)
(used by Melexis) trimming in the application is also possible
15:5 Not used
(Must be 0)
(**) - following fields are not accessible for write from RFID interface via device write command.
EE-Latches backup in EEPROM
The content of EE-Latches (Internal devices #03, #04 and #09) are copied in the EEPROM for backup:
EEPROM #27 and #28
Bits Description
#27 - Internal device backup word 1
15:0
Copy of internal device #03 bits [15:0]
#28 -Internal device backup word 2
3:0
Copy of internal device #04 bits [3:0]
15:4
random
Ex: The command read ADC buffer sensor 0 (Read Internal Device #06) sent by RFID or by SPI loads the configuration of the
sensor 0 from EEPROM (address #15 to #1A) into the register file and start the A/D conversion. The output of the conversion is
available in the internal device #02 (local buffer).
REVISION 011 - JUNE 13, 2017
3901090129
Page 16 of 60
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