ADIS16201/PCB AD [Analog Devices], ADIS16201/PCB Datasheet - Page 25

• Manufacturer Part Number: ADIS16201/PCB
• Description: Programmable Dual-Axis
• Manufacturer: AD [Analog Devices]

Once the ADIS16201 is placed into the power-down mode, it
can only return to normal operation by timing out, a reset
command (using the RST hardware control line), or by cycling
the power applied to the part. Once awake, the seven data
output registers can be scanned to determine what the state of
the output registers were prior to powering down. Once the
data is recovered, the device can be powered down again by
writing a non-zero value to the PWR_MDE control register and
starting the process over.
Once the power-down time is complete, the recovery time for
the ADIS16201 is approximately 2 ms. This recovery time is
implemented within the device to allow for recovery of the ADC
prior to performing the next data conversion. Note that the ND
data bit within the seven data output control registers is cleared
when the ADIS16201 is powered down. Likewise, the new data
hardware I/O line is placed into an inactive state prior to being
powered down. The DAC is placed into a power-down mode as
well, which results in the DAC output dropping to 0 V during
the power-down period. All control register settings are retained
while powered down with the exception of the PWR_MDE
control register, which is reset to 0 prior to power-down.
PWR_MDE Register Definition
Address
0x3B, 0x3A
1
The power-down period is determined by multiplying the
binary value represented by the data bits times the constant
0.5 seconds. This results in a variable power-down period of
0.5 seconds to 127.5 seconds with 0.5 seconds resolution in the
setting. A setting of 0 disables the power-down mode, whereas
any non-zero entry places the device in the power-down mode
at the next update of the data output registers. The power-down
register is volatile and is set to all 0s upon initial power-up and
recovery from the power-down mode.
Table 26. PWR_MDE Bit Descriptions
Bit
15:8
7:0
STATUS FEEDBACK
The status control register within the ADIS16201 is utilized in
determining the present state of the device. The ability to monitor
the device becomes necessary when and if the ADIS16201 has
registered an alarm or error condition as indicated by the “alarm
enable” (14) within the seven output data registers. The 16-bit
status register is broken into two bytes. The three lower bits of the
lower data byte are used to indicate which error condition exists,
while the two lower bits of the upper data byte are utilized in
indicating which alarm condition exists.
Default is valid only until the first register write cycle.
Description
Not used
Data bits
Default
0x0000
1
Format
Binary
Access
R/W
Rev. A | Page 25 of 32
STATUS Register Definition
Address
0x3D, 0x3C
1
The STATUS control register contains the alarm/error flags that
indicate abnormal operating conditions. See Table 27 for each
status bit definition. All flags are cleared upon the reading of the
status register. The flags are set on a continuing basis as long as
the error or alarm conditions persist.
Table 27. STATUS Bit Descriptions
Bit
15:10
9
8
7:4
3
2
1
0
COMMAND CONTROL
The COMMAND control register is utilized in sending global
commands to the ADIS16201 device. There are four separate
commands that act as global commands in the controlling of
the ADIS16201 operation. Any one of the four commands can
be implemented by writing 1 to its corresponding bit location.
The command control register has write-only capability and is
volatile. Table 28 describes each of these global commands.
COMMAND Register Definition
Address
0x3F, 0x3E
1
Default is valid only until the first register write cycle.
Default is valid only until the first register write cycle.
Description
Not used.
Alarm 2 status.
Alarm 1 status.
Not used.
SPI communications failure.
Control register update failed.
Power supply above 3.625 V.
Power supply below 2.975 V.
1: Error condition
0: Normal mode
1: Active
0: Normal mode
1: Active
0: Normal mode
1: Error condition
0: Normal mode
1: Error condition
0: Normal mode
1: Error condition
0: Normal mode
0x0000
Default
0x0000
Default
1
1
Format
Format
N/A
N/A
ADIS16201
Access
Read only
Access
Write only