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ADIS16485 Datasheet(PDF) 29 Page - Analog Devices

Part # ADIS16485
Description  Tactical Grade, Six Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16485 Datasheet(HTML) 29 Page - Analog Devices

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Data Sheet
ADIS16485
Table 91. SLP_CNT (Page 3, Base Address = 0x10)
Bits
Description
[15:10]
Not used
9
Power-down mode
8
Normal sleep mode
[7:0]
Programmable time bits; 1 sec/LSB; 0x00 = indefinite
If the sleep mode and power-down mode bits are both set high,
the normal sleep mode (SLP_CNT[8]) bit takes precedence.
General-Purpose Registers
The USER_SCR_x registers (see Table 92, Table 93, Table 94,
and Table 95) provide four 16-bit registers for storing data.
Table 92. USER_SCR_1 (Page 2, Base Address = 0x74)
Bits
Description
[15:0]
User-defined
Table 93. USER_SCR_2 (Page 2, Base Address = 0x76)
Bits
Description
[15:0]
User-defined
Table 94. USER_SCR_3 (Page 2, Base Address = 0x78)
Bits
Description
[15:0]
User-defined
Table 95. USER_SCR_4 (Page 2, Base Address = 0x7A)
Bits
Description
[15:0]
User-defined
Real-Time Clock Configuration/Data
The VDDRTC power supply pin (see Table 6, Pin 23) provides
a separate supply for the real-time clock (RTC) function. This
enables the RTC to keep track of time, even when the main supply
(VDD) is off. Configure the RTC function by selecting one of
two modes in CONFIG[0] (see Table 67). The real-time clock
data is available in the TIME_MS_OUT register (see Table 96),
TIME_DH_OUT register (see Table 97), and TIME_YM_OUT
register (see Table 98). 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
stopwatch. When using the clock/calendar mode, write the current
time to the real-time registers in the following sequence: 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]), and year (TIME_YM_OUT[14:8]).
The updates to the timer do not become active until there is a
successful write to the TIME_ YM_OUT[14:8] byte. The real-
time clock registers reflect the newly updated values only after
the next seconds tick of 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
not require 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 the CONFIG and TIME_xx_OUT registers are configured,
set GLOB_CMD[3] = 1 (DIN = 0x8003, DIN = 0x8208, DIN =
0x8300) to back up these settings up in flash, and use a separate
3.3 V source to supply power to the VDDRTC function. 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 only requires that VDDRTC = 3.3 V when the rest of
the ADIS16485 is turned off.
Table 96. 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 97. 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 98. 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
Rev. E | Page 29 of 32


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