ADIS16445SLASHPCBZ datasheet(14/22 Pages) AD

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ADIS16445

Data Sheet

Rev. F | Page 14 of 22

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 re-

spective 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 num-

ber 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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