MLX90129 データシートの表示（PDF） - Melexis Microelectronic Systems

部品番号

コンポーネント説明

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MLX90129

13.56MHZ SENSOR TAG / DATALOGGER IC

Melexis Microelectronic Systems  

MLX90129

13.56MHZ SENSOR TAG / DATALOGGER IC

DMA status register (Device Address Domain, #05, read only)

Bits Name

#05 - DMA status register

15:0 DMA_Current_Destination

_Address

Description

Address of the block of memory in the destination address domain

(which is still not filled with data from the source device).

9.1.5. Wake-up timer / Power management configuration

The Wake-up timer is used for two purposes:

- to wake-up the microcontroller after a defined delay via the IRQ pin

- to enable and sequence the periodical logging of data from the sensor

- to enter the stand-by mode after a programmed delay

The following table contains the control options of this timer:

Wake-up timer (WUT) / Power management configuration words

(EEPROM & register, addresses #0F and #10, read / write)

Bits Name

#10 – Timer Control word

Description (when =1)

15:6 -

5:4 WUT_Precision

3 WUT_AutoStandby_En

2 WUT_AutoLog_En

1-

0 WUT_Irq_En

Reserved (must be 0)

Precision. Defines the time unit for the specified timer wake-up period

(called Count-down period).

00: time in ms

01: time in s

10: time in min

11: time in hours

Automatic stand-by enabled. Allow the MLX90129 to automatically enter

the stand-by mode after the end of the wake-up timer count-down, or

after completion of the automatic logging (if it is enabled).

Automatic logging mode enabled. If this bit is set to ‘1’, the wake-up

timer loads its value from the Register file and starts a count-down. As

soon as it reaches 00h, it allows to run one or several sensor acquisitions

and to store the data in the programmed destination. Then, it loads its

count-down period again and starts counting. This process may be halted

by resetting this bit to ‘0’.

. Reserved (must be 0)

Timer IRQ enabled. The timer starts its operation and generates IRQ signal

after passing specified period.

#0F – Timer period

15:0 WUT_CountDownPeriod

Combined with the WUT_Precision, this parameter defines the period

between two measurements. If N is the conversion into decimal value of

the WUT_CountDownPeriod hexadecimal value, the nominal logging

period will be:

WUT_Precision = 00 -> Period = N * 0.9765625 ms

WUT_Precision = 01 -> Period = N * 1 s

WUT_Precision = 10 -> Period = N * 1 min

WUT_Precision = 11 -> Period = N * 1 hour

REVISION 011 - JUNE 13, 2017

3901090129

Page 41 of 60

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