FXAS21002CQR1 データシートの表示（PDF） - Freescale Semiconductor

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FXAS21002CQR1

3-Axis Digital Angular Rate Gyroscope

Freescale Semiconductor 

Modes of Operation

• Active: All blocks are enabled (digital and analog); the device is actively

measuring the angular rate at the ODR specified in 0x13: CTRL_REG1. This is

the maximum power consumption state of the device.

• Ready: This mode is entered by setting CTRL_REG1[Ready] = 1. In this mode,

the drive circuits are running but no measurements are being made. This mode

offers the user the ability to significantly reduce the current draw of the device

while providing a fast transition into Active mode within 1/ODR + 5 ms.

NOTE

When CTRL_REG3[EXTCTRLEN] = 0, the Active mode

is entered/exited using the register interface

(CTRL_REG1[ACTIVE] bit). When

CTRL_REG3[EXTCTRLEN] = 1, the Active mode is

entered/exited via the logic state on the PWR_CTRL input

pin (pin 2).

The functional mode is selected using CTRL_REG1. After a POR (Power on Reset), a

boot sequence is performed by the device and the registers are loaded with their preset

values. After the boot sequence completes, the default operating mode of

FXAS21002C is Standby mode.

POR (VDD > 1.95 V)

Boot

Boot_end = 1

Standby

Start-up sequence

Functional modes

CTRL_REG1[ACTIVE] = 0

and

CTRL_REG1[READY] = 0

CTRL_REG1[ACTIVE] = 1

CTRL_REG1[ACTIVE] = 0

and

CTRL_REG1[READY] = 0

Active

CTRL_REG1[ACTIVE] =0

and

CTRL_REG1[READY] = 1

CTRL_REG1[ACTIVE] = 0

and

CTRL_REG1[READY] = 1

CTRL_REG1[ACTIVE] = 1

Ready

Figure 18. Functional mode transition diagram with CTRL_REG3[EXTCTRLEN] = 0

3-Axis Digital Angular Rate Gyroscope, Rev. 2.1, 5/2015

25

Freescale Semiconductor, Inc.

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