MLX75031 Datasheet, PDF (58/67 Pages) Melexis Microelectronic Systems – Optical Gesture & Proximity Sensing IC

MLX75031
Optical Gesture & Proximity Sensing IC
with Integrated LED Drivers
Datasheet
8.15. 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 0)
• 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 0).
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, but either logic high or logic low.
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
bits 1 and 0 of the register 'Rst'.
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 001 – JANUARY, 2013
39010xxxxx
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