FXAS21002CQR1 Просмотр технического описания (PDF) - Freescale Semiconductor

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FXAS21002CQR1

3-Axis Digital Angular Rate Gyroscope

Freescale Semiconductor 

Digital Interfaces

3 Digital Interfaces

The registers embedded inside the device are accessed through either an I2C or an SPI

serial interface. To enable either interface, the VDDIO line must be connected to the

interface supply voltage. If VDD is not present and VDDIO is present, FXAS21002C is in

shutdown mode and communications on the interface are ignored. If VDDIO is

maintained, VDD can be powered off and the communications pins will be in a high

impedance state. This will allow communications to continue on the bus with other

devices.

Table 8. Serial interface pin descriptions

Pin name

VDDIO

SPI_CS_B

SCL/SCLK

SDA/MOSI/SPI Data

SA0/MISO

I2C_B/SPI

Pin description

Digital interface power

SPI chip select

I2C/SPI serial clock

I2C serial data/SPI master serial data out slave serial data in /SPI 3-wire data input/output

I2C least significant bit of the device address/SPI master serial data in slave serial data out

Digital interface mode selection pin

3.1 I²C Interface

To use the I2C interface, the I2C_B/SPI (pin 8) pin must be connected to GND

(logic low) and the SPI_CS_B (pin 17) must be made logic high (by providing it a

voltage equal to VDDIO). FXAS21002C's I2C interface is compliant with I2C interface

specification for Standard and Fast modes as outlined in the I2C-bus specification and

user manual - Rev 4, published by NXP Semiconductors. The 7-bit slave addresses that

may be assigned to the device are 0x20 (with SA0 = 0) and 0x21 (with SA0 = 1). When

I2C_B/SPI is held low, the SA0/MISO pin is used to define the LSB of this I2C address.

This part does not implement clock stretching. See Table 9 for the I2C slave addresses.

Table 9. I2C Slave Addresses

Command

Read

Write

Read

Write

Device Address Bit[0] (SA0

pin state)

0

0

1

1

Slave Address

Bits[6:0]

0x20

0x20

0x21

0x21

R/W Bit

1

0

1

0

Slave Address Byte Transmitted

by Master

0x41

0x40

0x43

0x42

12

Freescale Semiconductor, Inc.

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

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