ADIS16448SLASHPCBZ datasheet(14/24 Pages) AD

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ADIS16448

Data Sheet

Rev. B | Page 14 of 24

SYSTEM FUNCTIONS

GLOBAL COMMANDS

The GLOB_CMD register in Table 25 provides trigger bits

for software reset, flash memory management, and calibration

control. Start each of these functions by writing a 1 to the assigned

bit in GLOB_CMD. After completing the task, the bit automati-

cally returns to 0. For example, set GLOB_CMD[7] = 1 (DIN =

0xBE80) to initiate a software reset. Set GLOB_CMD[3] = 1 (DIN

= 0xBE08) to back up the user register contents in nonvolatile

flash. This sequence includes loading the control registers with

the data in their respective flash memory locations prior to

producing new data.

Table 25. GLOB_CMD (Base Address = 0x3E), Write Only

Bits

Description (Default = 0x0000)

[15:8]

Not used

Software reset

[6:4]

Not used

Flash update

Not used

Factory calibration restore

Gyroscope bias correction

PRODUCT IDENTIFICATION

The PROD_ID register in Table 28 contains the binary equivalent

of 16,448. It provides a product specific variable for systems that

need to track this in their system software. The LOT_ID1 and

LOT_ID2 registers in Table 26 and Table 27 combine to provide

a unique, 32-bit lot identification code. The SERIAL_NUM

the serial number on the device label. The assigned serial

numbers in SERIAL_NUM are lot specific.

Table 26. LOT_ID1 (Base Address = 0x52), Read Only

Bits

Description

[15:0]

Lot identification, binary code

Table 27. LOT_ID2 (Base Address = 0x54), Read Only

Bits

Description

[15:0]

Lot identification, binary code

Table 28. PROD_ID (Base Address = 0x56), Read Only

Bits

Description (Default = 0x4040)

[15:0]

Product identification = 0x4040

Table 29. SERIAL_NUM (Base Address = 0x58), Read Only

Bits

Description

[15:12]

Reserved

[11:0]

Serial number, 1 to 4094 (0xFFE)

SELF-TEST FUNCTION

The MSC_CTRL register in Table 30 provides a self-test function

for the gyroscopes, accelerometers, magnetometers, and

barometers. Note that the magnetometer results assume that

the non-earth magnetic fields are low, in comparison to the

earth’s magnetic field. This function allows the user to verify

the mechanical integrity of each MEMS sensor. When enabled,

the self test applies an electrostatic force to each internal sensor

element, which causes them to move. The movement in each

element simulates its response to actual rotation/acceleration

and generates a predictable electrical response in the sensor outputs.

Set MSC_CTRL[10] = 1 (DIN = 0xB504) to activate the internal self

test routine, which compares the response to an expected range of

responses and reports a pass/fail response to DIAG_STAT[5]. If this

is high, review DIAG_STAT[15:10] to identify the failing sensor.

Table 30. MSC_CTRL (Base Address = 0x34), Read/Write

Bits

Description (Default = 0x0006)

[15:12]

Not used

Checksum memory test (cleared upon completion)1

1 = enabled, 0 = disabled

Internal self test (cleared upon completion)1

1 = enabled, 0 = disabled

[9:8]

Do not use, always set to 00

Not used

Point of percussion, see Figure 22

1 = enabled, 0 = disabled

[5:3]

Not used

Data ready enable

1 = enabled, 0 = disabled

Data ready polarity

1 = active high when data is valid

0 = active low when data is valid

Data ready line select

1 = DIO2, 0 = DIO1

The bit is automatically reset to 0 after finishing the test.

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