L
linnix
- Jan 1, 1970
- 0
I am runing a sensor (1.5mA),
op amp lm/lmv/lpv358 (1/0.2/0.1mA)
and µC (0.5mA) on two button cells
The batteries range from 4V to 6V.
The sensor needs at least 4V.
The µC can have at most 3.3V.
The op amp is a sigma-delta A2D from sensor to µC.
So, I am thinking about a 4V zener to the sensor,
minus diode drop to the µC.
Should I power the op amp before or after the diode?
Also, 4V zener is hard to get.
Should I use 5V plus two more diodes?
I have to commit to PCB in a few days,
no time for more prototype/testing.
op amp lm/lmv/lpv358 (1/0.2/0.1mA)
and µC (0.5mA) on two button cells
The batteries range from 4V to 6V.
The sensor needs at least 4V.
The µC can have at most 3.3V.
The op amp is a sigma-delta A2D from sensor to µC.
So, I am thinking about a 4V zener to the sensor,
minus diode drop to the µC.
Should I power the op amp before or after the diode?
Also, 4V zener is hard to get.
Should I use 5V plus two more diodes?
I have to commit to PCB in a few days,
no time for more prototype/testing.