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ADXL313 数据表(PDF) 10 Page - Analog Devices

部件名 ADXL313
功能描述  3-Axis, 짹0.5 g/짹1 g/짹2 g/짹4 g Digital Accelerometer
Download  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADXL313 数据表(HTML) 10 Page - Analog Devices

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ADXL313
Data Sheet
Rev. 0 | Page 10 of 28
SERIAL COMMUNICATIONS
I2C and SPI digital communications are available. In both cases,
the ADXL313 operates as a slave. I2C mode is enabled if the CS pin
is tied high to VDD I/O. The CS pin must always be tied high to
VDD I/O or be driven by an external controller because there is no
default mode if the CS pin is left unconnected. Therefore, not
taking these precautions may result in an inability to communicate
with the part. In SPI mode, the CS pin is controlled by the bus
master. In both SPI and I2C modes of operation, ignore data
transmitted from the ADXL313 to the master device during
writes to the ADXL313.
SPI
For SPI communication, either 3- or 4-wire configuration is
possible, as shown in the connection diagrams in Figure 15 and
Figure 16. Clearing the SPI bit in the DATA_FORMAT register
(Address 0x31) selects 4-wire mode, whereas setting the SPI bit
selects 3-wire mode. The maximum SPI clock speed is 5 MHz
with 100 pF maximum loading, and the timing scheme follows
clock polarity (CPOL) = 1 and clock phase (CPHA) = 1. If power
is applied to the ADXL313 before the clock polarity and phase
of the host processor are configured, the CS pin must be brought
high before changing the clock polarity and phase. When using
the 3-wire SPI configuration, it is recommended that the SDO
pin be either pulled up to VDD I/O or pulled down to GND via a
10 kΩ resistor.
Figure 15. 3-Wire SPI Connection Diagram
Figure 16. 4-Wire SPI Connection Diagram
CS is the serial port enable line and is controlled by the SPI master.
This line must go low at the start of a transmission and high at
the end of a transmission, as shown in Figure 17 to Figure 19.
SCLK is the serial port clock and is supplied by the SPI master.
SCLK idles high during a period of no transmission. SDI and
SDO are the serial data input and output, respectively. Data is
updated on the falling edge of SCLK and sampled on the rising
edge of SCLK.
To read or write multiple bytes in a single transmission, the
multiple-byte bit, located after the R/W bit in the first byte transfer
(MB in Figure 17 to Figure 19), must be set. After the register
addressing and the first byte of data, each subsequent set of
clock pulses (eight clock pulses) causes the ADXL313 to point
to the next register for a read or write. This shifting continues
until the clock pulses cease and CS is deasserted. To perform reads
or writes on different, nonsequential registers, CS must be
deasserted between transmissions, and the new register must be
addressed separately.
The timing diagram for 3-wire SPI reads or writes is shown in
Figure 17. The 4-wire equivalents for SPI reads and writes are
shown in Figure 18 and Figure 19, respectively. For correct
operation of the part, the logic thresholds and timing parameters
in Table 8 and Table 9 must be met at all times.
Use of the 3200 Hz and 1600 Hz output data rates is recommended
only with SPI communication rates greater than or equal to 2
MHz. The 800 Hz output data rate is recommended only for
communication speeds greater than or equal to 400 kHz, and
the remaining data rates scale proportionally. For example, the
minimum recommended communication speed for a 200 Hz
output data rate is 100 kHz. Operation at an output data rate
below the recommended minimum may result in undesirable
effects on the acceleration data, including missing samples or
additional noise.
PROCESSOR
D OUT
D IN/OUT
D OUT
ADXL313
CS
SDIO
SDO
SCLK
PROCESSOR
D OUT
D OUT
D IN
D OUT
ADXL313
CS
SDI
SDIO
SCLK


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