MC44829D データシートの表示（PDF） - Motorola => Freescale

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MC44829D

PLL Tuning Circuit with I2C Bus

Motorola => Freescale 

MC44829

Figure 3. Typical HF Input Impedance

–j +j

0

0.5

0.5

1.3 GHz

ZO = 50 Ω

1

1

1.0 GHz

0.5

1

2

2

2

500 MHz

50 MHz

Data Format and Bus Receiver

The circuit receives the information for tuning and control

via the I2C bus. The incoming information, consisting of a

chip address byte followed by two or four data bytes, is

treated in the I2C bus receiver. The definition of the

permissible bus protocol is shown below:

1_STA CA

2_STA CA

3_STA CA

4_STA CA

CO BA

FM FL

CO BA

FM FL

STO

STO

FM FL

CO BA

STO

STO

STA = Start Condition

STO = Stop Condition

CA = Chip Address Byte

CO = Data Byte for Control Information

BA = Band Information

FM = Data Byte for Frequency Information (MSB’s)

FL = Data Byte for Frequency Information (LSB’s)

Figure 4. Complete Data Transfer Process

SDA

SCL

S

1–7

8

9

STA ADDRESS R/W ACK

CA

1–7

8

9

DATA

ACK

1–7

8

DATA

9

P

ACK STO

MOTOROLA ANALOG IC DEVICE DATA

5

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