ACS8522A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8522A' PDF : 118 Pages View PDF
ACS8522A SETS LITE
ADVANCED COMMS & SENSING
Address (hex): 0D
FINAL
Register Name sts_current_DPLL_frequency
[15:8]
Description
(RO) Bits [15:8] of the current
DPLL frequency.
DATASHEET
Default Value 0000 0000
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
sts_current_DPLL_frequency[15:8]
Bit 2
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
[7:0]
sts_current_DPLL_frequency[15:8]
This value in this register is combined with the value
in Reg. 0C and Reg. 07 to represent the current
frequency offset of the DPLL.
When Bit 4 (T4_T0_select) of Reg. 4B
(cnfg_registers_source_select) = 0 the frequency
for the T0 path is reported.
When this Bit 4 = 1 the frequency for the T4 path is
reported.
-
In order to calculate the ppm offset of the DPLL with
respect to the crystal oscillator frequency, the value
in Reg. 07, Reg. 0D and Reg. 0C need to be
concatenated. This value is a 2’s complement
signed integer. The value multiplied by 0.0003068
dec. will give the value in ppm offset with respect to
the XO frequency, allowing for any crystal calibration
that has been performed, via
cnfg_nominal_frequency, Reg. 3C and 3D. The
value is actually the DPLL integral path value so it
can be viewed as an average frequency, where the
rate of change is related to the DPLL bandwidth. If
bit 3 of Reg. 3B is High then this value will freeze if
the DPLL has been pulled to its min. or max.
frequency.
Address (hex): 0E
Register Name sts_sources_valid
Description
(RO) 8 least significant bits of the Default Value 0000 0000
sts_sources_valid register.
Bit 7
SEC3
Bit 6
Bit 5
Bit 4
Bit 3
SEC2
Bit 2
SEC1
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
7
[6:4]
3
2
[1:0]
SEC3
Bit indicating if SEC3 is valid. The input is valid if
either it has no outstanding alarms, or it only has a
soft frequency alarm.
Not used.
SEC2
Bit indicating if SEC2 is valid. The input is valid if
either it has no outstanding alarms, or it only has a
soft frequency alarm.
SEC1
Bit indicating if SEC1 is valid. The input is valid if
either it has no outstanding alarms, or it only has a
soft frequency alarm.
Not used.
0
Input SEC3 is invalid.
1
Input SEC3 is valid.
-
-
0
Input SEC2 is invalid.
1
Input SEC2 is valid.
0
Input SEC1 is invalid.
1
Input SEC1 is valid.
-
-
Revision 1.00/September 2007 © Semtech Corp.
Page 54
www.semtech.com
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