ISZ-650 INVENSENSE, ISZ-650 Datasheet - Page 7
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ISZ-650
Manufacturer Part Number
ISZ-650
Description
GYRO, SINGLE (Z) AXIS, +/-2000 DEG/S
Manufacturer
INVENSENSE
Datasheet
1.ISZ-650.pdf
(24 pages)
Specifications of ISZ-650
No. Of Axes
1
Sensor Case Style
QFN
No. Of Pins
28
Supply Voltage Range
2.7V To 3.3V
Operating Temperature Range
-20°C To +85°C
Sensitivity Per Axis
0.5mV / ° / S
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ISZ-650
Manufacturer:
INVENSENSE
Quantity:
7 600
6.5
Rotating the sensor about the Z-axis results in a Coriolis force on the Z-rate sensor. The Coriolis force
causes the mechanical structure to vibrate in-plane. The resulting vibration is detected by measuring the
capacitance change between the mechanical structure and fixed electrodes. This signal is converted to a
voltage waveform by means of low-noise charge integrating amplifier and amplification stages.
6.6
The output of the Coriolis sense is an amplitude modulated waveform. The amplitude corresponds to the
rotation rate, and the carrier frequency is the mechanical drive frequency. The synchronous demodulator
converts the Coriolis sense waveform to the low-frequency, angular rate signal.
6.7
After the demodulation stage, there is a low-pass filter. This filter attenuates noise and high frequency
artifacts before final amplification.
6.8
The Auto Zero function is used to reduce DC offset caused by bias drift. The implementation of this function
will vary by application requirement. Pin 24 (AZ) is used to set the Auto Zero function, resetting the bias to
approximately VREF.
6.9
A built-in Proportional-To-Absolute-Temperature (PTAT) sensor provides temperature information on Pin 23.
6.10 Charge Pump
The on-chip charge pump generates the voltage required to oscillate the mechanical structure.
6.11 Memory Trim
The on-chip memory is used to select the gyro’s sensitivity, calibrate the sensitivity, null DC offsets and
select the low-pass filter option
6.12 Scale Factor
The Rate-Out of the gyro is not ratiometric to the supply voltage. The scale factor is calibrated at the factory
and is nominally independent of supply voltage.
6.13 Reference Voltage
The gyro includes a bandgap reference circuit. The output voltage is typically 1.35V and is nominally
independent of temperature. The zero-rate signal is nominally equal to the reference value.
6.14 Analog Outputs
The ISZ-650 gyro has two Z-outputs (Z-OUT and Z4.5OUT), with scale factors and full-scale sensitivities that
vary by a factor of 4.5, as detailed in Section 8.2.7.
Having two sensitivities and two full-scale ranges for the one axis allows the end user to have one output that
can be used for faster motions (over a full scale range of ±2000º/sec), and a second output that can be used
for slower motions (over a full scale range of ±440º/sec). Thus a lower-resolution analog-to-digital converter
(ADC) may be used to digitize the motion, with the gain of 4.5 in the Z4.5OUT output effectively giving the
user additional two-plus bits of resolution.
CONFIDENTIAL & PROPRIETARY
Coriolis Sense
Demodulator
Low-Pass Filter
Auto Zero
Temperature Sensor
ISZ-650 Single-Axis Z-Gyroscope
Product Specification
7 of 24
PS-ISZ-0650B-00-02
Release Date: 07/08/09