ADIS16250

Rev. 0 | Page 14 of 20

PROGRAMMING AND CONTROL

CONTROL REGISTER OVERVIEW

The ADIS16250 offers many programmable features 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. The

features available for configuration in this register space are as

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 ADIS16250,

including address, volatile status, basic function, and

accessibility (read/write). The following sections contain

detailed descriptions and configurations for each of these

registers.

The ADIS16250 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

the limit. The nonvolatile column in Table 8 indicates the registers

that are recovered on power-up. 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, make sure 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

Register Name

Type

Volatility

Address

Bytes

Function

Reference Table

0x10

4

Reserved

GYRO_OFF

R/W

Nonvolatile

0x14

2

Gyroscope bias offset factor

Table 9, Table 10

GYRO_SCALE

R/W

Nonvolatile

0x16

2

Gyroscope scale factor

Table 11, Table 12

0x18 to to 0x1F

8

Reserved

ALM_MAG1

R/W

Nonvolatile

0x20

2

Alarm 1 amplitude threshold

Table 31, Table 32

ALM_MAG2

R/W

Nonvolatile

0x22

2

Alarm 2 amplitude threshold

Table 35, Table 36

ALM_SMPL1

R/W

Nonvolatile

0x24

2

Alarm 1 sample period

Table 33, Table 34

ALM_SMPL2

R/W

Nonvolatile

0x26

2

Alarm 2 sample period

Table 37, Table 38

ALM_CTRL

R/W

Nonvolatile

0x28

2

Alarm source control register

Table 39, Table 40

0x2A to 0x2F

6

Reserved

AUX_DAC

R/W

Volatile

0x30

2

Auxiliary DAC data

Table 21, Table 22

GPIO_CTRL

R/W

Volatile

0x32

2

Auxiliary digital I/O control register

Table 23, Table 24

MSC_CTRL

R/W

0x34

2

Miscellaneous control register

Table 26, Table 27

SMPL_PRD

R/W

Nonvolatile

0x36

2

ADC sample period control

Table 15, Table 16

SENS/AVG

R/W

Nonvolatile

0x38

2

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

2

Counter used to determine length of power-

down mode

Table 17, Table 18

STATUS

R

Volatile

0x3C

2

System status register

Table 28, Table 29

COMMAND

W

N/A

0x3E

2

System command register

Table 13, Table 14