ITG3200 データシートの表示（PDF） - Unspecified

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ITG3200

The ITG-3200 triple-axis MEMS gyroscope

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ITG-3200 Product Specification

Document Number: PS-ITG-3200A-00-01.4

Revision: 1.4

Release Date: 03/30/2010

5.4 I2C Serial Communications Interface

The ITG-3200 communicates to a system processor using the I2C serial interface, and the device always acts as a slave

when communicating to the system processor. The logic level for communications to the master is set by the

voltage on the VLOGIC pin. The LSB of the of the I2C slave address is set by pin 9 (AD0).

5.5 Clocking

The ITG-3200 has a flexible clocking scheme, allowing for a variety of internal or external clock sources for the

internal synchronous circuitry. This synchronous circuitry includes the signal conditioning, ADCs, and various control

circuits and registers. An on-chip PLL provides flexibility in the allowable inputs for generating this clock.

Allowable internal sources for generating the internal clock are:

An internal relaxation oscillator (less accurate)

Any of the X, Y, or Z gyros’ MEMS oscillators (with an accuracy of ±2% over temperature)

Allowable external clocking sources are:

32.768kHz square wave

19.2MHz square wave

Which source to select for generating the internal synchronous clock depends on the availability of external sources and

the requirements for clock accuracy. There are also start-up conditions to consider. When the ITG-3200 first starts up,

the device operates off of its internal clock until programmed to operate from another source. This allows the user, for

example, to wait for the MEMS oscillators to stabilize before they are selected as the clock source.

5.6 Sensor Data Registers

The sensor data registers contain the latest gyro and temperature data. They are read-only registers, and are accessed

via the Serial Interface. Data from these registers may be read at any time, however, the interrupt function may be used

to determine when new data is available.

5.7 Interrupts

Interrupt functionality is configured via the Interrupt Configuration register. Items that are configurable include the INT

pin configuration, the interrupt latching and clearing method, and triggers for the interrupt. Items that can trigger an

interrupt are (1) Clock generator locked to new reference oscillator (used when switching clock sources); and (2) new

data is available to be read from the Data registers. The interrupt status can be read from the Interrupt Status register.

5.8 Digital-Output Temperature Sensor

An on-chip temperature sensor and ADC are used to measure the ITG-3200 die temperature. The readings from the

ADC can be read from the Sensor Data registers.

5.9 Bias and LDO

The bias and LDO sections take in an unregulated VDD supply from 2.1V to 3.6V and generate the internal supply and

the references voltages and currents required by the ITG-3200. The LDO output is bypassed by a capacitor at

REGOUT. Additionally, the part has a VLOGIC reference voltage which sets the logic levels for its I2C interface.

5.10 Charge Pump

An on-board charge pump generates the high voltage (25V) required to drive the MEMS oscillators. Its output is

bypassed by a capacitor at CPOUT.

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