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L2G2IS Datasheet(PDF) 8 Page - STMicroelectronics

Part # L2G2IS
Description  Embedded temperature sensor
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L2G2IS Datasheet(HTML) 8 Page - STMicroelectronics

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Terminology & functionality
L2G2IS
8/26
DocID027248 Rev 2
2
Terminology & functionality
2.1
Sensitivity
An angular rate gyroscope is a device that produces a positive-going digital output 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.
2.2
Zero-rate level
The zero-rate level describes the actual output signal if there is no angular rate present. The
zero-rate level of highly accurate MEMS sensors is, to some extent, a result of stress to the
sensor and therefore the zero-rate level can slightly change after mounting the sensor on a
printed circuit board or after exposing it to extensive mechanical stress. This value changes
very little over temperature and time.
2.3
Data-ready interrupt and synchronous reading
On the L2G2IS the angular rate data can be retrieved using a synchronous read. To perform
a synchronous read, CTRL_REG3 (0Dh) (DRDY_EN) has to be set to '1' in order to enable
the data-ready interrupt on the DRDY pin (refer to Figure 4). To properly perform a
synchronous read, the angular rate data have to be read every time the DRDY pin goes
high.
The DRDY signal can be latched (default condition) or pulsed if the CTRL_REG1 (0Bh)
(P_DRDY) is set to ‘1’. When a latched condition is selected, the interrupt goes low when
the high part of one of the output channels is read (OUT_X_H (04h) or OUT_Y_H (06h)) and
returns high when new data is generated. When a pulsed condition is selected, the interrupt
behavior is independent from the reading operations and remains high for 75 μsec every
time new data is generated. The DRDY pin is set by default as push-pull output, but it can
be configured as open-drain output by setting CTRL_REG3 (0Dh) (PP_OD) to ‘1’.
2.4
Temperature sensor
The temperature data can be retrieved from the TEMP_OUT_L (01h), TEMP_OUT_H (02h)
register, as two’s complement data in 12-bit format left-justified. The output of the
temperature sensor is 0 at 25 °C.


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