ADIS16203SLASHPCBZ datasheet(14/28 Pages) AD

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ADIS16203

Rev. 0 | Page 14 of 28

PROGRAMMING AND CONTROL

CONTROL REGISTER OVERVIEW

The ADIS16203 offers many programmable features that are

controlled by writing commands to the appropriate control registers

using the SPI. For added system flexibility and programmability,

the following sections describe these controls and specify each

configuration in this register space follows:

•

Calibration: Automatic offset null, manual offset adjustment,

factory reset

•

Rotational direction: clockwise or counter-clockwise

•

Sample rate adjustment

•

Filter response optimization

•

Alarm settings: threshold or rate of change, and comparison

with filtered or unfiltered data

•

I/O configuration: data ready, etc.

•

Power management: sleep mode, normal and high

performance modes

•

Auxiliary DAC level setting

•

Status checks: verify power supply, SPI communication,

package orientation

•

Flash™ updates to store configuration

CONTROL REGISTER ACCESS

Table 8 displays the control register map for the ADIS16203,

including address, volatile status, basic function, and accessibility

(read/write). The following sections contain detailed descriptions

and configurations for each of these registers.

The ADIS16203 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 consid-

ering the system-level integration of these devices. 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

Nonvolatile

Address

Bytes

Function

0x00 to 0x01

Reserved

INCL_NULL

R/W

0x18

Incline null calibration

ALM_MAG1

R/W

0x20

Alarm 1 amplitude threshold

ALM_MAG2

R/W

0x22

Alarm 2 amplitude threshold

ALM_SMPL1

R/W

0x24

Alarm 1 sample period

ALM_SMPL2

R/W

0x26

Alarm 2 sample period

ALM_CTRL

R/W

0x28

Alarm source control register

0x2A to 0x2F

Reserved

AUX_DAC

R/W

0x30

Auxiliary DAC data

GPIO_CTRL

R/W

0x32

Auxiliary digital I/O control register

MSC_CTRL

R/W

0x34

Miscellaneous control register

SMPL_TIME

R/W

0x36

ADC sample period control

AVG_CNT

R/W

0x38

Defines number of samples used by moving average filter

SLP_CNT

R/W

0x3A

Counter used to determine length of power-down mode

STATUS

0x3C

System status register

COMMAND

0x3E

System command register

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