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ADIS16488A Datasheet(PDF) 32 Page - Analog Devices

Part # ADIS16488A
Description  Tactical Grade, Ten Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADIS16488A Datasheet(HTML) 32 Page - Analog Devices

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ADIS16488A
Data Sheet
Rev. C | Page 32 of 35
General-Purpose Registers
The USER_SCR_x registers(see Table 121, Table 122, Table 123,
and Table 124)provide four 16-bit registersfor storing data.
Table 121. USER_SCR_1(Page 2, Base Address = 0x74)
Bits
Description
[15:0]
User defined
Table 122. USER_SCR_2(Page 2, Base Address = 0x76)
Bits
Description
[15:0]
User defined
Table 123. USER_SCR_3(Page 2, Base Address = 0x78)
Bits
Description
[15:0]
User defined
Table 124. USER_SCR_4(Page 2, Base Address = 0x7A)
Bits
Description
[15:0]
User defined
Real-Time Clock Configuration/Data
The VDDRTC powersupply pin (see Table 6, Pin 23) provides
a separate supply forthe real-time clock(RTC)function. This
enablestheRTCtokeeptrackoftime,even when themainsupply
(VDD)is off.
Configure the RTC function by selecting one of two modesin
CONFIG[0](see Table 75). The real-time clockdata is available
in the TIME_MS_OUTregister (seeTable125), TIME_DH_OUT
register (see Table 126), and TIME_YM_OUT register(see
Table 127). When using the elapsed timer mode, the time data
registers start at 0x0000 when the device starts up (or resets)
and begin keeping time in a manner that is similar to a stop-
watch.
When using the clock/calendar mode, write the current time to
the real-timeregistersin thefollowingsequence: seconds(TIME_
MS_OUT[5:0]), minutes (TIME_MS_OUT[13:8]), hours
(TIME_DH_OUT[5:0]), day (TIME_DH_OUT[12:8]), month
(TIME_YM_OUT[3:0]), andyear(TIME_YM_OUT[14:8]). The
updatesto thetimer onlybecomeactiveaftera write is completed
correctlyto theTIME_YM_OUT[14:8]byte.
The real-time clockregisters reflect the newly updated
values only after the next secondstickof the clock that
follows the write to TIME_YM_OUT[14:8](year). Writing to
TIME_YM_OUT[14:8]activates all timing values; therefore,
always write to this location last when updating the timer, even
if the year information does notrequire updating.
Write the current time to each time data register after setting
CONFIG[0]= 1 (DIN = 0x8003, DIN = 0x8A01). Note that
CONFIG[1]provides a bit for managing daylight savings time.
After theCONFIG andTIME_xx_OUTregistersareconfigured,
set GLOB_CMD[3]= 1 (DIN = 0x8003, DIN = 0x8204, DIN =
0x8300) to backup these settings in flash, and use a separate
3.3 V source to supply power to the VDDRTCfunction. Note
that access to time data in the TIME_xx_OUT registers requires
normal operation (VDD = 3.3 V and full startup), but the timer
function onlyrequires that VDDRTC= 3.3V when theremainder
of the ADIS16488A is turned off.
Table 125. TIME_MS_OUT (Page 0, Base Address = 0x78)
Bits
Description
[15:14]
Not used
[13:8]
Minutes, binary data, range = 0 to 59
[7:6]
Not used
[5:0]
Seconds, binary data, range = 0 to 59
Table 126. TIME_DH_OUT (Page 0, Base Address = 0x7A)
Bits
Description
[15:13]
Not used
[12:8]
Day, binary data, range = 1 to 31
[7:6]
Not used
[5:0]
Hours, binary data, range = 0 to 23
Table 127. TIME_YM_OUT (Page 0, Base Address = 0x7C)
Bits
Description
[15]
Not used
[14:8]
Year, binary data, range = 0 to 99, relative to 2000 A.D.
[7:4]
Not used
[3:0]
Month, binary data, range = 1 to 12


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