ADIS16505-2SLASHPCBZ datasheet(24/41 Pages) AD

24 / 41 page

ADIS16505

Data Sheet

Rev. C | Page 24 of 41

USER REGISTER DEFINTIONS

Status/Error Flag Indicators (DIAG_STAT)

Table 10. DIAG_STAT Register Definition

Addresses

Default

Access

Flash Backup

0x02, 0x03

0x0000

Table 11. DIAG_STAT Bit Assignments

Bits

Description

[15:11]

Reserved.

Accelerometer failure. A 1 indicates failure of the

accelerometer at the conclusion of the self test

(Register GLOB_CMD, Bit 2, see Table 112). If this error

occurs, repeat the same test. If this error persists,

replace the ADIS16507. Motion during this test may

cause a false failure.

Gyroscope 2 failure. A 1 indicates failure of Gyroscope 2 at

the conclusion of the self test (Register GLOB_CMD, Bit 2,

see Table 112). If this error occurs, repeat the same test.

If this error persists, replace the ADIS16507. Motion

during this test may cause a false failure.

Gyroscope 1 failure. A 1 indicates failure of Gyroscope 1 at

the conclusion of the self test (Register GLOB_CMD, Bit 2,

see Table 112). If this error occurs, repeat the same test.

If this error persists, replace the ADIS16507. Motion

during this test may cause a false failure.

Clock error. A 1 indicates that the internal data

sampling clock (fSM, see Figure 30) does not

synchronize with the external clock, which only applies

when using scaled sync mode (Register MSC_CTRL,

Bits[3:2] = 10, see Table 106). When this error occurs,

adjust the frequency of the clock signal on the SYNC pin

to operate within the appropriate range.

Memory failure. A 1 indicates a failure in the flash memory

test (Register GLOB_CMD, Bit 4, see Table 112), which

involves a comparison between a cyclic redundancy

check (CRC) calculation of the present flash memory

and a CRC calculation from the same memory locations at

the time of initial programming (during the production

process). If this error occurs, repeat the same test. If this

error persists, replace the ADIS16505.

Sensor failure. A 1 indicates failure of at least one

sensor, at the conclusion of the self test (Register

GLOB_CMD, Bit 2, see Table 112). If this error occurs,

repeat the same test. If this error persists, replace the

ADIS16505. Motion during this test may cause a false

failure.

Standby mode. A 1 indicates that the voltage across

VDD and GND is <2.8 V, which causes data processing

to stop. When VDD ≥ 2.8 V for 250 ms, the ADIS16505

reinitializes itself and starts producing data again.

SPI communication error. A 1 indicates that the total

number of SCLK cycles is not equal to an integer

multiple of 16. When this error occurs, repeat the

previous communication sequence. Persistence in this

error can indicate that the SPI connection between the

host and the ADIS16505 is not robust (for example,

marginal voltage levels, timing, or signal integrity).

Bits

Description

Flash memory update failure. A 1 indicates that the

most recent flash memory update (Register GLOB_CMD,

Bit 3, see Table 112) failed. If this error occurs, ensure that

VDD ≥ 3 V and repeat the update attempt. If this error

persists, replace the ADIS16505.

Data path overrun. A 1 indicates that one of the data

paths experienced an overrun condition. If this error

occurs, initiate a reset using the RST pin (see Table 5,

Pin F3) or Register GLOB_CMD, Bit 7 (see Table 112).

Reserved.

The DIAG_STAT register (see Table 10 and Table 11) provides

error flags for monitoring the integrity and operation of the

ADIS16505. Reading this register resets its bits to 0. The error

flags in DIAG_STAT are sticky, meaning that when they raise

to a 1, they remain there until a read request clears them. If an

error condition persists, the flag (bit) automatically returns to

an alarm value of 1.

GYROSCOPE DATA

The gyroscopes in the ADIS16505 measure the angular rate of

rotation around three orthogonal axes (x, y, and z). Figure 48

shows the orientation of each gyroscope axis along with the

direction of rotation that produces a positive response in each

of their measurements.

ωY

Y-AXIS

ωX

X-AXIS

A10

ωZ

Z-AXIS

Figure 48. Gyroscope Axis and Polarity Assignments

Each gyroscope has two output data registers. Figure 49 shows

how these two registers combine to support a 32-bit, twos

complement data format for the x-axis gyroscope measurements.

This format also applies to the y- and z-axes.

X-AXIS GYROSCOPE DATA

X_GYRO_OUT

X_GYRO_LOW

BIT 0 BIT 15

BIT 15

BIT 0

Figure 49. Gyroscope Output Data Structure

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