LY3100ALH STMicroelectronics, LY3100ALH Datasheet - Page 8

• Manufacturer Part Number: LY3100ALH
• Description: Gyroscopes MEMS Motion Sensor 1000 Dps Analog Yaw
• Manufacturer: STMicroelectronics

Specifications of LY3100ALH

• Sensing Axis: Single
• Supply Current: 4.2 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Sensitivity: 1.1 mV/deg/s
• Package / Case: LGA-10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Terminology
4
4.1
4.2
4.3
4.4
8/13
Terminology
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.
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.
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
exhibits 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
working properly and the parameters of the interface chip are within the defined
specifications.
Sleep mode, self test and power down
The LY3100ALH enables advanced power-saving features thanks to the availability of three
different operating modes. When the device is set in a Sleep mode configuration, the
reading chain is completely turned off, resulting in low power consumption. In this condition
the device turn-on time is significantly reduced, allowing simple external power cycling.
In accordance with the table below, the user can select the desired operating mode using
two dedicated pins (ST and SLEEP/PD).
Table 6.
Operating mode
Normal mode
Power-down
Sleep mode
Self-test
Sleep mode and Power-down mode configuration
Doc ID 16570 Rev 1
ST pin
0
0
1
1
Table
3, then the mechanical element is
SLEEP/PD pin
0
1
0
1
LY3100ALH