DVK90129 Melexis Inc, DVK90129 Datasheet - Page 48

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

Specifications of DVK90129

• Contents: Board, Proxima RF™ Desktop Reader
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: MLX90129

The power management unit controls the following features of the MLX90129:
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,
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 007
9.3 Power management
•
•
•
•
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)
but
the
MLX90129
consumes
13.56MHZ SENSOR TAG / DATALOGGER IC
a
Page 48 of 56
MLX90129
Data Sheet
March 2011