ADXL326
Rev. 0 | Page 12 of 16
Self test response in g is roughly proportional to the square of
the supply voltage. However, when ratiometricity of sensitivity
is factored in with supply voltage, the self test response in volts
is roughly proportional to the cube of the supply voltage.
For example, at V
S
= 3.6 V, the self test response for the
ADXL326 is approximately −107 mV for the X axis, +107 mV
for the Y axis, and +181 mV for the Z axis. At V
S
= 2 V, the self
test response is approximately −18 mV for the X axis, +18 mV
for the Y axis, and −31 mV for the Z axis.
The supply current decreases as the supply voltage decreases.
Typical current consumption at V
S
= 3.6 V is 375 µA, and
typical current consumption at V
S
= 2 V is 200 µA.
AXES OF ACCELERATION SENSITIVITY
07948-025
Z
A
Y
A
X
T
O
P
Figure 23. Axes of Acceleration Sensitivity (Corresponding Output Voltage
Increases When Accelerated Along the Sensitive Axis)
07948-026
X
OUT
= –1g
Y
OUT
= 0g
Z
OUT
= 0g
GRAVITY
OUT
= 0g
OUT
= 1g
OUT
= 0g
X
OUT
= 0g
Y
OUT
= –1g
Z
OUT
= 0g
X
OUT
= 1g
Y
OUT
= 0g
Z
OUT
= 0g
X
OUT
= 0g
Y
OUT
= 0g
Z
OUT
= 1g
X
OUT
= 0g
Y
OUT
= 0g
Z
OUT
= –1g
TOP
TOP
TOP
TOP
T
O
P
Figure 24. Output Response vs. Orientation to Gravity
