MLX75030 Datasheet, PDF (60/72 Pages) Melexis Microelectronic Systems – Universal ActiveLight Sensor Interface

MLX75030 Universal ActiveLight Sensor Interface
Datasheet
7.7. Wake-up from Sleep or Standby
The figure below shows what happens when switching operation mode, and the behaviour of the DR pin and the watchdog
timer.
The WAKE_UP pin is only monitored during Sleep and Standby. When a falling edge is detected during Sleep or Standby, the
following will happen:
- the DR pin goes low for a time t_{wakeup_stby} or t_{wakeup_slp}
- the watchdog timer is initialised and starts counting, when waking up from Sleep
- the device changes to Normal Running Mode, enabling the appropriate blocks
POR
WAKE-UP
NRM Mode
STBY Mode
SLP Mode
DR
Level depending
on CR /SM/ SD
tstartup
Watchdog
Active
Level
depending on
CR/SM/SD
twakeup_stby
Level depending
on CR /SM/SD
twakeup_slp
Active
Figure 18 : Behaviour of DR and Watchdog when switching mode
REVISION 005 – DECEMBER 2013
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