ADIS16445SLASHPCBZ datasheet(14/24 Pages) AD

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ADIS16445

Data Sheet

Rev. A | Page 14 of 24

SYSTEM FUNCTIONS

GLOBAL COMMANDS

The GLOB_CMD register in Table 19 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 19. 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 22 contains the binary equivalent

of 16,445. 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 20 and Table 21, respectively, combine

to provide a unique, 32-bit lot identification code.

The SERIAL_NUM register in Table 23 contains a binary

number that represents the serial number on the device label.

The assigned serial numbers in SERIAL_NUM are lot specific.

Table 20. LOT_ID1 (Base Address = 0x52), Read Only

Bits

Description

[15:0]

Lot identification, binary code

Table 21. LOT_ID2 (Base Address = 0x54), Read Only

Bits

Description

[15:0]

Lot identification, binary code

Table 22. PROD_ID (Base Address = 0x56), Read Only

Bits

Description (Default = 0x403D)

[15:0]

Product identification = 0x403D (16,445)

Table 23. 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 24 provides a self-test function

for the gyroscopes and accelerometers. 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 move-

ment 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 bit is high, review DIAG_STAT[15:10] to

identify the failing sensor.

Table 24. 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 21

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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