MLX75031 Datasheet, PDF (25/67 Pages) Melexis Microelectronic Systems – Optical Gesture & Proximity Sensing IC

MLX75031
Optical Gesture & Proximity Sensing IC
with Integrated LED Drivers
Datasheet
Besides this continuous monitoring, it is possible to do a VSUP voltage measurement on request.
This is included in the Measurement Sequence 1 of the Start Measurement command.
Please refer to Section 8.11.4 for more information.
The overall transfer function for the VSUP measurement is defined by following formula :
V_SUP
=
16.6 ×
ADC _VSUP
13107
• V_SUP: the voltage on the pin VSUP (in V)
• ADC_VSUP: the decimal value of the VSUP measurement (see Output Data Frame of read-out)
8.6. Power-On Reset
The Power On Reset (POR) is connected to voltage supply.
At power-on the POR cell generates a reset signal before the supply voltage exceeds a level of V_POR-ON.
The cell contains a hysteresis of 100mV.
VPOR
VPOR-ON
VPOR-OFF
hysteresis
Figure 7 : POR sequence
VDD
8.7. Oscillator (RC)
The integrated oscillator has to provide a clock signal to the digital control logic, the watchdog timer and the
ADC. The oscillator will run with a frequency at 2.5MHz, all other components with 1.25MHz.
The drift of f_osc over temperature and supply voltage is smaller than 8%.
The oscillator can be enabled and disabled when changing the modes (NRM/STBY –SLP). It is active in
normal mode and in standby mode. In sleep mode, it is disabled.
8.8. ADC MUX
The ADC multiplexer transfers the various voltages of interest to the AD converter.
REVISION 001 – JANUARY, 2013
39010xxxxx
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