STEVAL-MKI037V1

LPY530AL

Terminology

Doc ID 15807 Rev 2

7/12

   

   

   

3 Terminology

3.1 Sensitivity

An angular rate gyroscope is a device that produces a positive-going output voltage for 
counterclockwise rotation around the sensible axis considered. Sensitivity describes the 
gain of the sensor and can be determined by applying a defined angular velocity to it. This 
value changes very little over temperature and time.

3.2 Zero-rate 

level

Zero-rate level describes the actual output signal if there is no angular rate present. Zero-
rate level of precise MEMS sensors is, to some extent, a result of stress to the sensor and
therefore zero-rate level can slightly change after mounting the sensor onto a printed circuit
board or after exposing it to extensive mechanical stress. This value changes very little over
temperature and time.

3.3 Self-test

Self-test allows testing the mechanical and electrical part of the sensor, allowing the seismic 
mass to be moved by means of an electrostatic test-force. The Self-test function is off when 
the ST pin is connected to GND. When the ST pin is tied to Vdd, an actuation force is 
applied to the sensor, emulating a definite Coriolis force. In this case the sensor output will 
exhibit a voltage change in its DC level which is also dependent on the supply voltage. 
When ST is active, the device output level is given by the algebraic sum of the signals 
produced by the velocity acting on the sensor and by the electrostatic test-force. If the output 
signals change within the amplitude specified in 

Table 3

, then the mechanical element is 

working properly and the parameters of the interface chip are within the defined 
specification.

3.4 

High pass filter reset (HP)

LPY530AL provides the possibility to reset the optional external high pass filter by applying 
high logic value to HP pad. This procedure ensures faster response expecially during 
overload conditions. Moreover, this operation is suggested each time the device is powered.

      Obsolete Product(s) - Obsolete Product(s)

STEVAL-MKI037V1 Datasheet Related Products:
STEVAL-MKI037V1 Information:
Part No.
STEVAL-MKI037V1
Description
EVAL BOARD FOR LPY530AL
File Size
231560 bytes
Page Size
595 x 842 pts (A4)
All Pages
12
Manufacturer
STMicroelectronics
Homepage
http://www.st.com/web/en/home.html
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