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): 3C
FINAL
Register Name cnfg_nominal_frequency
[7:0]
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.
-
In order to program the ppm offset of the crystal
oscillator frequency, the value in Reg. 3C and
Reg. 3D hex 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.
Address (hex): 3E
Register Name cnfg_holdover_frequency
[7:0]
Description
(R/W) Bits [7:0] of the manual
Holdover frequency register.
Default Value 0000 0000
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
holdover_frequency_value[7:0]
Bit 2
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
[7:0]
holdover_frequency_value[7:0]
-
See Reg. 3F (cnfg_holdover_frequency) for details.
Revision 1.00/September 2007 © Semtech Corp.
Page 65
www.semtech.com
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