DVK90129 Melexis Inc, DVK90129 Datasheet - Page 49

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DVK90129

Manufacturer Part Number
DVK90129
Description
DEVELOPMENT KIT MLX90129
Manufacturer
Melexis Inc
Series
-r
Type
Development kitr
Datasheets

Specifications of DVK90129

Contents
Board, Proxima RF™ Desktop Reader
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
MLX90129
9.3.2 Oscillators management
The MLX90129 can use 3 clock sources from:
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.
The power management mode is defined by several switches configurable through the EEPROM and EE-
Latch.
The commands of these switches are defined as:
3901090129
Rev 007
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)
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.
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
13.56MHZ SENSOR TAG / DATALOGGER IC
Page 49 of 56
MLX90129
Data Sheet
March 2011

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