MLX90129 View Datasheet(PDF) - Melexis Microelectronic Systems
Part Name
Description
Manufacturer
MLX90129 Datasheet PDF : 60 Pages
| |||
MLX90129
13.56MHZ SENSOR TAG / DATALOGGER IC
9.3. Power management
The power management unit controls the following features of the MLX90129:
Start-up modes (with or without battery)
Power modes (stand-by, sleep, watchful or run mode)
Energy scavenging for battery-less applications
Oscillators management (digital clock, wake-up timer)
9.3.1. Power modes
Power-off mode
No battery, no field. The MLX90129 can quit this
mode when a battery is connected or when a RF
field is applied.
SLEEP MODE
(Ultra low power)
Watchful mode
This mode is the initial state, after power-on. In this
state, the digital part is activated; the MLX90129 can
receive commands from the RFID or SPI.
DMA request
RFID command
SPI command
SPI (SS=0)
WakeUp Timer
RFID field
Run mode
Depending on the command from SPI or RFID, or on
request from DMA, the MLX90129 enters the Run
mode, where all the blocks implied in the transaction
are powered. This state is not low-power, but time-
limited.
WATCHFUL MODE
(Low power)
Initial state at power-on
Controlled by:
Digital Power
Management
RFID command
SPI command
RFID field
SPI (SS=0)
STANDBY MODE
(Lowest power)
Stand-by mode
RUN MODE:
In the stand-by mode, the supply voltage is applied,
but the MLX90129 consumes a minimum current.
Memory access
Sensor access
Typically, this mode is used after the module has
been assembled and tested. Then, it can be stored for a long time
without wasting the battery energy.
The Digital Controller can not exit this mode by itself. It can only exit it by an external interrupt: emission of a RFID field or
asserting low the Slave Select input of the SPI (during a specified time)
The MLX90129 may re-enter this mode upon request from SPI or RFID (in writing the Wake-up Timer configuration word). It is
possible to enter this mode after a programmed count-down from the Wake-up timer, or after a logging sequence.
Sleep mode
In the Sleep mode, only the wake-up timer works and sends an IRQ pulse (Interrupt Request) to the microcontroller after a
programmable time period. The MLX90129 may leave this mode in the following cases:
_ emission of a RFID field
_ asserting low the Slave Select input of the SPI (during a specified time)
_ DMA request to run an acquisition after a defined time period.
In the sleep and the stand-by modes, it is possible to power-down the external device supplied by VREG.
REVISION 011 - JUNE 13, 2017
3901090129
Page 52 of 60
Share Link: 