Fend, Matthias wrote:
i'm using a MSP430F1232 in a battery powered enviroment.
In LPM4 the complete circuit normally draws about 2uA, but if i apply
about vdd/2 to the analog input (i'm using P2.1/INCLK/A1) the current
consumption raises
to about 9uA. The current strongly depends from the applied voltage (0V ~ 2uA,
0.7V ~ 2uA, 1.5V ~9.5uA).
my configuation:
-P2.1 is GP digital input and AE is set for A1
-ADC and Ref. (int. 2.5V) both are off
-A1 is routed through the input mux
as i read in some docs the digital I/O circuit should be disconnected if AE is
set - but
if i change P2.1 to a digital output, current consumption will be about 30uA...
so i think there is something strange...
did i something wrong ? any ideas ?
thanks for any suggestions,
matthias
You haven't turned off the digital I/O function on that pin. It is still
acting as a digital input in its linear region. If you get the voltage
just right you can draw 120uA :-).
Regards,
Steve
