MLX90129 データシートの表示（PDF） - Melexis Microelectronic Systems
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MLX90129 Datasheet PDF : 60 Pages
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MLX90129
13.56MHZ SENSOR TAG / DATALOGGER IC
9.3.2. Oscillators management
The MLX90129 can use 3 clock sources from:
An internal 5MHz RC-oscillator for the digital clock
An internal low-power low-frequency RC-oscillator (used as a wake-up timer)
An external low-power low-frequency quartz oscillator (used for accurate wake-up timer)
The use of the quartz oscillator is optional. If it is chosen instead of the RC-oscillator, then a 32.768kHz crystal should be
connected between the pads XIN and XOUT.
9.3.3. Energy scavenging
The MLX90129 embeds power supply management capabilities which allow a strong flexibility to design data logger devices with
strong power consumption constraints. It is possible to store the energy from the incoming magnetic field into an external
capacitor, on pad VFIELD or to run from a coin cell battery.
COIL1
COIL2
VBAT
Regulator
RFID front-end
Disconnect Vfield and Vbat
(Internal Device #03 - bit 15)
VFIELD
Bypass VREG
(Internal Device #04 - bit 2)
External Supply Mode
(EEPROM #12 - bit 13)
Regulator
Low / High volt mode
(Internal Device #04 - bit 3)
Regulator
SENSOR INTERFACE
OSCILLATORS
Power
Manager
DIGITAL
VREG
The power management mode is defined by several switches configurable through the EEPROM and EE-Latch.
For the battery-less applications, VFIELD pad can be used to supply the MLX90129 if the switch between VFIELD and
VBAT is closed (default).
For battery applications, the switch between VFIELD and VBAT could be open
For both kind of application, it is possible to supply the external device (external SPI memory or microcontroller) via
VREG. The supply can be either at any time, or only in watchful state depending the External Supply Mode switch
configuration
The Regulator which supplies VREG can be bypassed using the switch Bypass VREG. The output voltage on VREG is short
cuts with Vbat and Vfield.
The VREG and SENSOR (Vref) regulators can be configured in high or low volt mode.
The commands of these switches are defined as:
Disconnect Vfield Vbat = Internal Device #03, bit 15
Bypass VREG = Internal Device #04, bit 2
External Supply Mode = EEPROM #12, bit 13
High or Low volt mode = Internal Device #04, bit 3
REVISION 011 - JUNE 13, 2017
3901090129
Page 53 of 60
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