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| 型号： | L3G3250ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA16 |
| 封装： | 3.50 X 3.00 MM, 1.00 MM HEIGHT, GREEN, PLASTIC, LGA-16 |
| 文件页数： | 11/12页 |
| 文件大小： | 257K |
| 代理商： | L3G3250ATR |
Mechanical and electrical specifications
L3G3250A
8/12
Doc ID 022118 Rev 1
2.4
Terminology
2.4.1
Sensitivity
An angular rate gyroscope is a device that produces a positive-going digital output for
counter-clockwise 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.
2.4.2
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.
2.4.3
Self-test (ST)
Self-test allows the testing of the mechanical and electric parts of the sensor, allowing the
seismic mass to be moved by means of an electrostatic test-force. When the ST is activated
by the IC, an actuation force is applied to the sensor, emulating a definite Coriolis force. In
this case the sensor output will exhibit a change in the output. When ST is active, the device
output is given by the algebraic sum of the signals produced by the velocity acting on the
sensor and by the electrostatic test-force.
2.5
Sleep mode, self-test and power-down
The L3G3250A enables advanced power saving functionality thanks to the different
operating modes available. When the device is set in the Sleep mode configuration, the
reading chain is completely turned off, allowing lower power consumption. In this condition,
the device turn-on time is significantly reduced permitting simpler external power cycling.
The user can select the desired operating mode through two dedicated pins.
2.6
Soldering information
The LGA package is compliant with the ECOPACK, RoHS and “Green” standard.
It is qualified for soldering heat resistance according to JEDEC J-STD-020.
Leave “Pin 1 Indicator” unconnected during soldering.
Land pattern and soldering recommendations are available at www.st.com/mems.
Table 6.
Sleep mode, self-test and power-down mode configuration
Operating mode
ST pin
Sleep pin
Normal mode
0
Power-down
0
1
Self-test
1
0
Sleep mode
1
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