MLX75030 Datasheet, PDF (59/72 Pages) Melexis Microelectronic Systems – Universal ActiveLight Sensor Interface

MLX75030 Universal ActiveLight Sensor Interface
Datasheet
7.6. Reset Behaviour
Power-On Reset
After a Power-On Reset, the device is operating in Normal Running Mode. All internal data registers are set to their initial
state:
• the device state is Normal Running Mode
• the Watchdog counter is initialized to generate the initial window time
• all registers containing (diagnostic) measurement data are initialized to 0x00
• bits 7, 4, 3 of the Internal Status Flags are cleared
• the user settings registers are set to their initial values (see Section 7.4)
• the 'Err' register will initialize to 0x00. However, as some voltages are continuously measured, it will reflect
immediately if an error is detected or not.
The MR pin will be initialized to '1'. The DR pin will be initialized to '0', but after the time t_startup it will switch to '1' to indicate
that the device is ready to accept the first command (see also Section 7.9).
The output of the MISO pin is depending on the CS state: if CS is high, the MISO pin is in tri-state. If CS is low, the output of
the MISO pin is undefined.
CR Command
At every upload of the CR command, the device returns to the state like it is after a Power-On-Reset, except for the
Watchdog counter and the state of the MR line. The Watchdog counter and the state of the MR line will not be influenced by
uploading a CR command. Also, the CR command will not change the contents of the 'Rst' register.
After a CR command the DR pin will be kept low during a time t_startup.
Read-out
At the end of each read-out, all registers containing (diagnostic) measurement data are cleared to 0x00.
Watchdog time-out
When a reset occurs due to a watchdog time-out, the MR pin will go low for a time t_MR. The Watchdog counter will be
initialized with the window time t_{wdt_init}. All other states, lines and registers of the ASIC will not be affected.
Changing operation mode
When changing operation mode (RSLP, CSLP, RSTBY, CSTBY, NRM) the right status flags are set.
Changing operation mode will not affect the user settings registers and the (diagnostic) measurement data registers.
The DR pin will be set to '0' and after the time t_{wakeup_slp} resp. t_{wakeup_stby} it will be set to '1', when waking up from Sleep resp.
Standby Mode.
REVISION 005 – DECEMBER 2013
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