ADIS16228SLASHPCBZ datasheet(23/28 Pages) AD

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Data Sheet

ADIS16228

Rev. B | Page 23 of 28

SYSTEM TOOLS

Table 63 provides an overview of the control registers that

provide support for system-level functions.

Table 63. System Tool Register Addresses

Address

Description

FLASH_CNT

0x00

Flash memory write cycle count

DIO_CTRL

0x36

Digital I/O configuration

GPIO_CTRL

0x38

General-purpose I/O control

DIAG_STAT

0x3C

Status/error flags

GLOB_CMD

0x3E

Global commands

LOT_ID1

0x52

Lot Identification Code 1

LOT_ID2

0x54

Lot Identification Code 2

PROD_ID

0x56

Product identification

SERIAL_NUM

0x58

Serial number

USER_ID

0x5C

User identification register

GLOBAL COMMANDS

The GLOB_CMD register (see Table 64) provides an array of

single-write commands for convenience. Setting the assigned bit

to 1 activates each function. When the function completes, the

bit restores itself to 0. For example, clear the capture buffers by

setting GLOB_CMD[8] = 1 (DIN = 0xBF01). All of the commands

in the GLOB_CMD register require that the power supply be

within normal limits for the execution times listed in Table 64.

Table 64. GLOB_CMD (Base Address = 0x3E), Write Only

Bits

Description

Execution Time

Clear autonull correction

35 µs

Retrieve spectral alarm band infor-

mation from the ALM_PNTR setting

40 µs

Retrieve record data from flash

memory

1.9 ms

Save spectral alarm band registers

to flash memory

461 µs

Record start/stop

N/A

Set BUF_PNTR = 0x0000

36 µs

Clear spectral alarm band

registers from flash memory

25.8 ms

Clear records

25.9 ms

Software reset

52 ms

Save registers to flash memory

29.3 ms

Flash test, compare sum of flash

memory with factory value

5 ms

Clear DIAG_STAT register

36 µs

Restore factory register settings

and clear the capture buffers

84 ms

Self-test, result in DIAG_STAT[5]

32.9 ms

Power-down

N/A

Autonull

822 ms

STATUS/ERROR FLAGS

The DIAG_STAT register (see Table 65) provides a number

of status/error flags that reflect the conditions observed in

a recording during SPI communication and diagnostic tests.

An error condition is indicated by a setting of 1; and all of the

error flags are sticky, which means that they remain until they

are reset by setting GLOB_CMD[4] = 1 (DIN = 0xBE10) or by

starting a new recording event. DIAG_STAT[14:8] indicates which

ALM_x_MAGx thresholds were exceeded during a recording

event. The flag in DIAG_STAT[3] indicates that the total number

of SCLK clocks is not a multiple of 16.

Table 65. DIAG_STAT (Base Address = 0x3C), Read Only

Bits

Description (Default = 0x0000)

Not used (don’t care)

System alarm flag

Z-axis, Spectral Alarm 2 flag

Y-axis, Spectral Alarm 2 flag

X-axis, Spectral Alarm 2 flag

Z-axis, Spectral Alarm 1 flag

Y-axis, Spectral Alarm 1 flag

X-axis, Spectral Alarm 1 flag

Data ready/busy indicator (0 = busy, 1 = data ready)

Flash test result, checksum flag

Self-test diagnostic error flag

Recording escape flag, indicates use of the SPI-driven

interruption command, 0xE8

SPI communication failure (SCLKs ≠ even multiple of 16)

Flash update failure

Power supply > 3.625 V

Power supply < 3.125 V

POWER-DOWN

To power down the ADIS16228, set GLOB_CMD[1] = 1 (DIN =

0xBE02). To reduce power consumption, set REC_CTRL1[7] = 1,

which automatically results in a power-down after a record is

complete. Toggle the CS line from high to low to wake up the

device and place it in an idle state, where it waits for the next

command. When DOI1 is configured as an external trigger,

toggling it can wake up the device, as well. Using DIO1 for this

purpose avoids the potential for multiple devices contending

for DOUT when waking up with the CS line approach. After

completing the record cycle, the device remains awake. Use

GLOB_CMD[1] to put it back to sleep after reading the

record data.

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