ISZ-500 Datasheet, PDF (14/24 Pages) List of Unclassifed Manufacturers – ISZ-500 Single-Axis Z-Gyro Product Specification

ISZ-500 Single-Axis Z-Gyroscope
Product Specification
PS-ISZ-0500B-00-03
Release Date: 07/08/09
When activated, the Auto Zero circuit internally nulls the ZRO to approximately VREF. The typical
usage of Auto Zero is in conditions where:
1. The gyro’s motion is known, such as when:
a. The gyro is stationary.
b. Other sensors can report angular rotation rate.
2. The DC value of the gyro output is not important, but only the AC value is. In this case, a digital
ac filter may be used to extract the gyro data, which provides a higher-quality output than is
possible with an analog R-C filter.
The Auto Zero function is initiated on the rising edge of the AZ pin. The Auto Zero settling time is
typically 7ms. This time includes the time required for nulling the ZRO and for the settling of the
internal low pass filter (LPF). If the external LPF bandwidth is less than 200Hz, the Auto Zero settling
time will be longer than specified.
The AZ pulse width should meet the specified minimum time requirement of 2µs to start the Auto Zero
function, and should be shorter than the maximum specified time of 1,500µs. The Auto Zero pulse
should occur after the start-up period to cancel any initial calibration error.
8.2.9 High Impedance Nodes
The ZAGC pin is a high impedance node (>1Mohm). Any coating, glue or epoxy on this pin or on the
capacitor connected to this pin, will affect part performance and should be avoided.
8.2.10 Charge Pump
The on-chip charge pump requires a capacitor for stable operation. This capacitor should be 0.1µF and
rated for 25V.
8.2.11 Proper Interface Cleaning
Proper cleaning of PCB solder pads prior to assembly is recommended. PCB surface contaminants at
pin 15 may affect part performance.
8.2.12 Acoustic Noise Sensitivity
The ISZ-500 gyroscope is insensitive to vibration except for a narrow frequency range near the gyro’s
resonant frequency and at odd multiples of the resonant frequency. The typical bandwidth of the
acoustic sensitivity is 200Hz. It is recommended that products using the ISZ-500 gyroscope along with
mechanical actuators be designed such that the acoustic noise in the 20kHz to 31kHz range be
attenuated by the product’s enclosure avoids these frequency ranges.
8.2.13 Electrostatic Discharge Sensitivity
The ISZ-500 gyroscope can be permanently damaged by an electrostatic discharge. ESD precautions
for handling and storage are recommended.
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