ADIS16201SLASHPCB datasheet(29/32 Pages) AD

29 / 32 page

Data Sheet

ADIS16201

Rev. C | Page 29 of 32

APPLICATIONS

SERIAL PERIPHERAL INTERFACE (SPI)

The ADIS16201 integrates a hardware SPI on-chip. SPI is an

industry-standard synchronous serial interface that allows data

to be transmitted and received simultaneously, that is, full duplex

up to a maximum bit rate of 2.5 Mbps depending upon the

sample period selection. The SPI port is configured for slave

operation and consists of four pins.

DOUT

The data out pin (DOUT) is an output pin used to transmit

data out of the ADIS16201. The data is transmitted in a 16-bit

(2–byte) format, MSB first.

DIN

The data-in pin (DIN) is an input pin that is used for the

reception of data from the master. The data is received in a

16-bit (2-byte) format with the W/R control bit and address

contained in the first data byte and the data contained within

the second data byte, MSB first.

SCLK

The serial clock pin (SCLK) is used to synchronize the data

being transmitted and received through the SCLK period.

Therefore, a 16-bit (2-byte) word is transmitted/received after

16 SCLK periods. The SCLK pin is configured as an input.

In the ADIS16201 a transfer is initiated by the assertion of the

chip select pin (CS), which is an active-low signal. The SPI port

then transmits and receives data in 16-bit blocks until the

transfer is concluded by de-assertion of CS.

The control registers within the ADIS16201 are based upon a

16-bit (2-byte) format. Data is loaded in from the DIN pin of

the ADIS16201 on the rising edge of SCLK. This requires 16

serial clocks for every data transfer framed by the low period of

the CS line. The part operates in full duplex mode with the data

clocked out of the DOUT pin, likewise on the rising edge of the

SCLK. For each read command received, the corresponding

output data is clocked out of the DOUT pin during the

following cycle, as defined by the CS line.

OUTPUT RESPONSE

Figure 39 displays the typical output response for the

ADIS16201 for several gravitational measurement orientations.

This is a convenient plot for understanding the basic orientation

of the inertial sensor measurement axes.

BOTTOM

VIEW

(Not to Scale)

X_ACCLOUT = 0LSB

Y_ACCLOUT = –2162LSB

NOTES

1. DATA SHOWN IN TWOS COMPLEMENT FORMAT.

X_ACCLOUT = 0LSB

Y_ACCLOUT = +2162LSB

X_ACCLOUT = –2162LSB

Y_ACCLOUT = 0LSB

X_ACCLOUT = +2162LSB

Y_ACCLOUT = 0LSB

EARTH’S SURFACE

Figure 39. Output Response vs. Orientation

HARDWARE CONSIDERATIONS

The ADIS16201 can be operated from a single 3.3 V (3.0 V to

3.6 V) power supply. The ADIS16201 integrates two decoupling

capacitors that are 1 μF and 0.1 μF in value. For the local

operation of the ADIS16201, no additional power supply

decoupling capacitance is required.

However, if the system power supply presents a substantial

amount of noise, additional filtering can be required. If

additional capacitors are required, connect the ground terminal

of each of these capacitors directly to the underlying ground

plane. Finally, note that all analog and digital grounds should be

referenced to the same system ground reference point.

GROUNDING AND BOARD LAYOUT RECOMENDATIONS

Maintaining low impedance signal return paths can be very

critical in managing system-level noise effects. For best results,

use a single, continuous ground plane that is tied to each

ADIS16201 ground pin via short via and trace lengths. In

addition to maintaining a low-impedance ground structure,

routing the SPI signals away from any sensitive analog circuits,

such as the ADC and DACs (if they are in use), can help

mitigate system-level noise risks.

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