Datasheet > DS4000D0BGA

DS4000D0BGA

更新时间： 2023-02-15 00:00:00

品牌	Logo	应用领域
达拉斯 - DALLAS		/
页数	文件大小	规格书
14页	246K
描述
Oscillator, 10MHz Min, 19.44MHz Max, 13MHz Nom,

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DS4000D0BGA 数据手册

DS4000

Digital Tuning the Base Crystal Frequency

When using the 2-wire interface for tuning the base frequency, the frequency tuning register is used. The

frequency tuning register contains two’s complement data. The data is used to add or subtract an offset

from the crystal loading register. When the tuning register is programmed with a value, the next

temperature-update cycle sums the programmed value with the factory-compensated value. This allows

the user/system to digitally control the base frequency by a microcontroller using the 2-wire protocol.

FREQUENCY TUNING REGISTER (66h)

BIT 7

SIGN

BIT 6

FO6

BIT 5

FO5

BIT 4

FO4

BIT 3

FO3

BIT 2

FO2

BIT 1

FO1

BIT 0

FO0

FOS[6:0] – Frequency Offset. These bits are used to tune the base crystal frequency. Each bit represents

approximately 0.05ppm and, therefore, for a value of 07FH, pushes or pulls the base frequency by

approximately 6.35ppm.

SIGN – Sign Bit. This bit is used to determine whether to add or subtract the frequency offset from the

crystal loading.

Table 1. FREQUENCY TUNING RELATIONSHIP

CALCULATED

DIGITAL DATA

(Binary)

DIGITAL DATA

(hex)

FREQUENCY OFFSET

(ppm)

+6.35

+5.0

+3.3

+1.2

+0.05

0.0

0111 1111

0110 0100

0100 0010

0001 0111

0000 0001

0000 0000

1111 1111

1110 1000

1011 0011

1001 1100

1000 0000

7Fh

64h

42h

17h

01h

00h

FFh

E8h

B3h

9Ch

80h

-0.05

-1.2

-3.3

-5.0

-6.35

4 of 14

1 2 345 6 7...14

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