ADIS16IMU1SLASHPCBZ datasheet(15/38 Pages) AD

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Data Sheet

ADIS16486

Rev. 0 | Page 15 of 38

USER REGISTER DEFINITIONS

Page Number (PAGE_ID)

The contents in the PAGE_ID register (see Table 12 and Table 13)

contain the current page setting and provide a control for selecting

another page for SPI access. For example, set DIN = 0x8002 to

select Page 2 for SPI-based user access. See Table 10 for the page

assignments associated with each user accessible register.

Table 12. PAGE_ID Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x00

0x00, 0x01

0x0000

R/W

Table 13. PAGE_ID Bit Definition

Bits

Description (Default = 0x0000)

[15:0]

Page number, binary numerical format

Data and Sample Counter (DATA_CNT)

The DATA_CNT register (see Table 14 and Table 15) is a

continuous, real-time, sample counter. The counter starts at

0x0000, increments every time that the sensor output data

registers update, and wraps around from 0xFFFF to 0x0000.

Table 14. DATA_CNT Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x00

0x04, 0x05

Not applicable

Table 15. DATA_CNT Bit Definition

Bits

Description (No Default)

[15:0]

Data counter, binary format

Internal Power Supply Monitor (SENS_PWR)

The SENS_PWR register (see Table 16 and Table 17) is a read

only register that provides a measurement of the internal power

supply. Table 18 provides some examples of the data format.

Table 16. SENS_PWR Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x00

0x06, 0x07

Not applicable

Table 17. SENS_PWR Bit Definition

Bits

Description (No Default)

[15:0]

Relative power supply measurement, twos complement

(see Equation 1)

2.5 V

LSB

SENS PWR

Supply





×−









(1)

Table 18. SENS_PWR Data Format Examples

Supply Level (V)

Decimal

Hex

Binary

4.90

+669

0x029D

0000 0010 1001 1101

4.95

+331

0x014B

0000 0001 0100 1011

0x0000

0000 0000 0000 0000

5.05

−324

0xFEBC

1111 1110 1011 1100

5.10

−643

0xFD7D

1111 1101 0111 1101

Status and Error Flag Indicators (SYS_E_FLAG)

The SYS_E_FLAG register (see Table 19 and Table 20) provides

various error flags. Reading this register causes its bits to return

to 0, except for Bit 7. If an error condition persists, the flag (bit)

automatically returns an alarm value of 1.

Table 19. SYS_E_FLAG Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x00

0x08, 0x09

0x0000

Table 20. SYS_E_FLAG Bit Definitions

Bits

Description (Default = 0x0000)

Watch dog timer flag. A 1 indicates that the ADIS16486

automatically resets itself to clear an issue.

[14:9]

Not used.

Internal power supply monitor. A 1 indicates an issue

with the power supply for the sensors. Initiate a reset to

recover. Replace the ADIS16486 if this error persists.

Processing overrun. A 1 indicates the occurrence of a

processing overrun. Initiate a reset to recover. Replace

the ADIS16486 if this error persists. One potential source

of this error is not providing power to the VDDRTC pin.

Flash memory update failure. A 1 indicates that the

most recent flash memory update (GLOB_CMD, Bit 3, see

Table 141) failed. Repeat the test and replace the

ADIS16486 if this error persists.

Sensor failure. A 1 indicates the failure of at least one of

the self test processes: continuous or on demand. Run

the ODST (GLOB_CMD, Bit 1, see Table 141) when the

unit is in not in motion. Replace the ADIS16486 if the

error persists.

Overrange. A 1 indicates that the digital magnitude of at

least one sensor has reached 99% of its maximum value.

Initiate a reset to recover and replace the ADIS16486 if

this error persists.

SPI communication error. A 1 indicates that the total

number of SCLK cycles is not equal to an integer multiple

of 16. Repeat the previous communication sequence to

recover. Persistence in this error can indicate a weakness in

the SPI service from the master processor.

SRAM error condition. A 1 indicates a failure in the CRC

(period = 20 ms) between the SRAM and flash memory.

Initiate a reset to recover. Replace the ADIS16486 if this

error persists.

Boot memory failure. A 1 indicates that the CRC on the

primary flash memory bank did not match the reference

CRC value, and that the device automatically rebooted

using the backup memory bank in flash. Replace the

ADIS16486 if this error persists.

Alarm status flag. A 1 indicates that one of the user-

programmable alarms is active. See the ALM_STS

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