ADIS16255PCBZ datasheet(13/20 Pages) AD

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Preliminary Technical Data

ADIS16255

Rev. PrA | Page 13 of 20

PROGRAMMING AND CONTROL

CONTROL REGISTER OVERVIEW

The ADIS16255 offers many programmable features that are

controlled by writing commands to the appropriate control

registers using the SPI. The following sections describe these

controls and specify each function and corresponding register

configuration. A list of features available for configuration in

this register space follows:

•

Calibration

•

Global commands

•

Operational Control

•

Sample rate

•

Power management

•

Digital filtering

•

Dynamic range

•

DAC output

•

Digital I/O

•

Operational Status and Diagnostics

•

Self test

•

Status conditions

•

Alarms

CONTROL REGISTER ACCESS

Table 8 displays the control register map for the ADIS16255,

including address, volatile status, basic function, and

accessibility (read/write). The following sections contain

detailed descriptions and configurations for each of these

registers.

The ADIS16255 is a flash-based device with the nonvolatile

functional registers implemented as flash registers. Take into

account the endurance limitation of 20,000 writes when

considering the system-level integration of these devices. The

ENDURANCE register (see Table 30) maintains a flash memory

write count, which provides a tool for keeping track of this

limit. The nonvolatile column in Table 8 indicates the registers

that are recovered on power-up. The user must use a manual flash

update command (using the command register) to store the

nonvolatile data registers once they are configured properly.

When performing a manual flash update command, the user

needs to ensure that the power supply remains within limits for

a minimum of 50 ms after the start of the update. This ensures

a successful write of the nonvolatile data.

Table 8. Control Register Mapping

Type

Volatility

Address

Bytes

Function

Reference Table

0x10

Reserved

GYRO_OFF

R/W

Nonvolatile

0x14

Gyroscope bias offset factor

Table 9, Table 10

GYRO_SCALE

R/W

Nonvolatile

0x16

Gyroscope scale factor

Table 11, Table 12

0x18 to to 0x1F

Reserved

ALM_MAG1

R/W

Nonvolatile

0x20

Alarm 1 amplitude threshold

Table 31, Table 32

ALM_MAG2

R/W

Nonvolatile

0x22

Alarm 2 amplitude threshold

Table 35, Table 36

ALM_SMPL1

R/W

Nonvolatile

0x24

Alarm 1 sample period

Table 33, Table 34

ALM_SMPL2

R/W

Nonvolatile

0x26

Alarm 2 sample period

Table 25, Table 26

ALM_CTRL

R/W

Nonvolatile

0x28

Alarm source control register

Table 37, Table 38

0x2A to 0x2F

Reserved

AUX_DAC

R/W

Volatile

0x30

Auxiliary DAC data

Table 21, Table 22

GPIO_CTRL

R/W

Volatile

0x32

Auxiliary digital I/O control register

Table 23, Table 24

MSC_CTRL

R/W

Nonvolatile1

0x34

Miscellaneous control register

Table 26, Table 27

SMPL_PRD

R/W

Nonvolatile

0x36

ADC sample period control

Table 15, Table 16

SENS/AVG

R/W

Nonvolatile

0x38

Defines the dynamic range (sensitivity setting)

and the number of taps for the digital filter

Table 19, Table 20

SLP_CNT

R/W

Volatile

0x3A

Counter used to determine length of power-

down mode

Table 17, Table 18

STATUS

Volatile

0x3C

System status register

Table 28, Table 29

COMMAND

N/A

0x3E

System command register

Table 13, Table 14

1 The contents of the upper byte are non-volatile and the contents of the lower byte are volatile

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