LY510ALHTR

LY510ALH

Terminology

Doc ID 15800 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 sensitive 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. The 
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 of 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 
specifications.

3.4 

High pass filter reset (HP)

The LY510ALH provides the possibility to reset the optional external high pass filter by 
applying a high logic value to the HP pad. This procedure ensures faster response, 
especially during overload conditions. Moreover, this operation is suggested each time the 
device is powered.

      Obsolete Product(s) - Obsolete Product(s)

LY510ALHTR Datasheet Related Products:
LY510ALHTR Information:
Part No.
LY510ALHTR
Description
GYROSCOPE MEMS SGL AXIS 16-LGA
File Size
220966 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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