ACS8525P datasheet(62/112 Pages) SEMTECH

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ADVANCED COMMUNICATIONS

FINAL

DATASHEET

Revision 3.01/August 2005 © Semtech Corp.

Page 62

www.semtech.com

ACS8525 LC/P

Address (hex):

[7:0]

Description

(R/W) Bits [7:0] of the register

used to calibrate the crystal

oscillator used to clock the

device.

Default Value

1001 1001

Bit 7Bit 6

Bit 5Bit 4

Bit 3

Bit 2Bit 1Bit 0

cnfg_nominal_frequency_value[7:0]

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):

[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 7Bit 6

Bit 5Bit 4

Bit 3

Bit 2Bit 1Bit 0

cnfg_nominal_frequency_value[15:8]

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.

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