MLX90129RUC-CAA-000-WB(2012) 데이터 시트보기 (PDF) - Melexis Microelectronic Systems

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MLX90129RUC-CAA-000-WB
(Rev.:2012)

13.56MHZ SENSOR TAG / DATALOGGER IC

Melexis Microelectronic Systems  

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.

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.

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.

Stand-by mode

In the stand-by mode, the supply voltage is

applied, but the MLX90129 consumes a

minimum current. 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.

3901090129

Rev 009

Page 52 of 60

Data Sheet

Jun/12

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