ACS8525T View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8525T' PDF : 112 Pages View PDF
ACS8525 LC/P
ADVANCED COMMUNICATIONS
Address (hex): 3C
Register Name cnfg_nominal_frequency
[7:0]
FINAL
Description
(R/W) Bits [7:0] of the register
used to calibrate the crystal
oscillator used to clock the
device.
DATASHEET
Default Value 1001 1001
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
cnfg_nominal_frequency_value[7:0]
Bit 2
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
[7:0]
cnfg_nominal_frequency_value[7:0].
-
See register description of Reg. 3D
(cnfg_nominal_frequency_value[15:8]).
Address (hex): 3D
Register Name cnfg_nominal_frequency
[15:8]
Description
(R/W) Bits [15:8] of the register
used to calibrate the crystal
oscillator used to clock the
device.
Default Value
1001 1001
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
cnfg_nominal_frequency_value[15:8]
Bit 2
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
[7:0]
cnfg_nominal_frequency_value[15:8]
This register is used in conjunction with Reg. 3C
(cnfg_nominal_frequency_value[7:0].) to be able to
offset the frequency of the crystal oscillator by up to
+514 ppm and –771 ppm. The default value
represents 0 ppm offset from 12.800 MHz.
This value is an unsigned integer.
The value in Reg. 3C/3D is used within the DPLL to
offset the frequency value used in the DPLL only.
This means that the value programmed will affect
the value reported in the
sts_current_DPLL_frequency (Reg. 07/0D/0C). IIt
will also affect the value programmed into the DPLL
frequency offset limit .
-
In order to program the ppm offset of the crystal
oscillator frequency, the value in Reg. 3C and
Reg. 3D need to be concatenated. This value is an
unsigned integer. The value multiplied by
0.0196229 dec will give the value in ppm. To
calculate the absolute value, the default 39321
(9999 hex) needs to be subtracted.
Revision 3.01/August 2005 © Semtech Corp.
Page 62
www.semtech.com
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