ADIS16505-2SLASHPCBZ datasheet(19/41 Pages) AD

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Data Sheet

ADIS16505

Rev. C | Page 19 of 41

BURST READ FUNCTION

The burst read function provides a way to read a batch of output

data registers, using a continuous stream of bits, at a rate of up

to 1 MHz (SCLK). This method does not require a stall time

between each 16-bit segment (see Figure 3). As shown in Figure 42,

start this mode by setting DIN = 0x6800, and then read each of

the registers in the sequence out of DOUT while keeping CS

low for the entire data transfer sequence. However, keeping the

CS pin low after a burst transfer is complete may delay the next

data ready pulse and may potentially interfere with the

processing of the next IMU sample.

The three options for burst mode include: scaled sync mode on

or off, BURST32 enabled and disabled, and BURST_SEL = 0 or

BURSET_SEL = 1. This results in eight possible burst data formats.

Scaled Sync Mode Enabled vs. Disabled

The only differences in the burst data format between these two

modes are the final two bytes in a burst. In scaled sync mode,

the final two bytes are the values of the TIME_STAMP registers.

When scaled sync mode is disabled, the final two bytes are the

values in the DATA_CNTR registers. As always, Bits[15:8]

appear before Bits[7:0] in both modes.

For the rest of this section, it is assumed that scaled sync mode

is disabled.

16-Bit Burst Mode with BURST_SEL = 0

In 16-bit burst mode with BURST_SEL = 0, a burst contains

calibrated gyroscope and accelerometer data in 16-bit format.

This mode is particularly appropriate for cases where there is

no decimation nor filtering. Not only is the sample rate high

(~2 kSPS), the lower 16 bits are not used unless the user is

averaging or filtering.

SCLK

DIN

DOUT

0x6800

DIAG_STAT

X_GYRO_OUT

CHECKSUM

Figure 42. Burst Read Sequence with BURST_SEL = 0

The sequence of registers (and checksum value) in the burst

read includes the following registers and value: DIAG_STAT,

X_GYRO_OUT, Y_GYRO_OUT, Z_GYRO_OUT, X_ACCL_

OUT, Y_ACCL_OUT, Z_ACCL_OUT, TEMP_OUT, DATA_

CNTR, and the checksum value.

In these cases, use the following formula to verify the 16-bit

checksum value, treating each byte in the formula as an

independent, unsigned, 8-bit number:

Checksum = DIAG_STAT, Bits[15:8] + DIAG_STAT, Bits[7:0] +

X_GYRO_OUT, Bits[15:8] + X_GYRO_OUT, Bits[7:0] +

Y_GYRO_OUT, Bits[15:8] + Y_GYRO_OUT, Bits[7:0] +

Z_GYRO_OUT, Bits[15:8] + Z_GYRO_OUT, Bits[7:0] +

X_ACCL_OUT, Bits[15:8] + X_ACCL_OUT, Bits[7:0] +

Y_ACCL_OUT, Bits[15:8] + Y_ACCL_OUT, Bits[7:0] +

Z_ACCL_OUT, Bits[15:8] + Z_ACCL_OUT, Bits[7:0] +

TEMP_OUT, Bits[15:8] + TEMP_OUT, Bits[7:0] +

DATA_CNTR, Bits[15:8] + DATA_CNTR, Bits[7:0]

16-Bit Burst Mode with BURST_SEL = 1

In 16-bit burst mode with BURST_SEL = 1, a burst contains

calibrated delta angle and delta velocity data in 16-bit format.

This mode is particularly appropriate for cases where there is

no decimation nor filtering. Not only is the sample rate high

(~2 kSPS), the lower 16 bits are not used.

SCLK

DIN

DOUT

0x6800

DIAG_STAT

X_DELTANG_

OUT

CHECKSUM

Figure 43. Burst Read Sequence with BURST_SEL = 1

The sequence of registers (and checksum value) in the burst

read includes the following registers and value: DIAG_STAT,

X_DELTANG_OUT, Y_DELTANG_OUT, Z_DELTANG_OUT,

X_DELTVEL_OUT, Y_DELTVEL_OUT, Z_DELTVEL_OUT,

TEMP_OUT, DATA_ CNTR, and the checksum value.

In these cases, use the following formula to verify the 16-bit

checksum value, treating each byte in the formula as an

independent, unsigned, 8-bit number:

Checksum = DIAG_STAT, Bits[15:8] + DIAG_STAT, Bits[7:0] +

X_DELTANG_OUT, Bits[15:8] + X_DELTANG_OUT, Bits[7:0] +

Y_DELTANG_OUT, Bits[15:8] + Y_DELTANG_OUT, Bits[7:0] +

Z_DELTANG_OUT, Bits[15:8] + Z_DELTANG_OUT, Bits[7:0] +

X_DELTVEL_OUT, Bits[15:8] + X_DELTVEL_OUT, Bits[7:0] +

Y_DELTVEL_OUT, Bits[15:8] + Y_DELTVEL_OUT, Bits[7:0] +

Z_DELTVEL_OUT, Bits[15:8] + Z_DELTVEL_OUT, Bits[7:0] +

TEMP_OUT, Bits[15:8] + TEMP_OUT, Bits[7:0] +

DATA_CNTR, Bits[15:8] + DATA_CNTR, Bits[7:0]

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