ACS8525AT Semtech, ACS8525AT Datasheet - Page 62

• Manufacturer Part Number: ACS8525AT
• Manufacturer: Semtech

Specifications of ACS8525AT

• Lead Free Status / RoHS Status: Compliant

Address (hex):
Address (hex):
Revision 1.00/September 2007 © Semtech Corp.
ADVANCED COMMS & SENSING
Register Name
Register Name
Bit No.
Bit No.
Bit 7
[7:0]
Bit 7
[7:0]
3C
3D
cnfg_nominal_frequency
[7:0]
Description
cnfg_nominal_frequency_value[7:0].
cnfg_nominal_frequency
[15:8]
Description
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 .
Bit 6
Bit 6
Bit 5
Bit 5
cnfg_nominal_frequency_value[15:8]
cnfg_nominal_frequency_value[7:0]
Description
Description
Bit 4
Bit 4
FINAL
Page 62
(R/W) Bits [7:0] of the register
used to calibrate the crystal
oscillator used to clock the
device.
(R/W) Bits [15:8] of the register
used to calibrate the crystal
oscillator used to clock the
device.
Bit Value
Bit Value
Bit 3
Bit 3
-
-
Value Description
See register description of Reg. 3D
(cnfg_nominal_frequency_value[15:8]).
Value Description
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.
Bit 2
Bit 2
ACS8525A LC/P
Default Value
Default Value
Bit 1
Bit 1
DATASHEET
www.semtech.com
1001 1001
1001 1001
Bit 0
Bit 0