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MC44864M Datasheet(PDF) 8 Page - Motorola, Inc |
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MC44864M Datasheet(HTML) 8 Page - Motorola, Inc |
8 / 12 page MC44864 8 MOTOROLA ANALOG IC DEVICE DATA Figure 5. TV Tuner for Automatic Alignment VHF UHF 12 V AGC DA1 Mixer Filter Filter Local Oscillator IF 33 V 5.0 V SCL MC44864 PLL–D/A IC Band Buffers BIII SDA DA2 DA3 VCC3 Antenna HF Input XTAL VCC2 VCC1 Clock Data D–to–A Converters NVM Phase Cmp Amp In VTUN Figure 6. Definition of Bytes CA1_PLL Chip Address 1 1 0 0 A3 A2 A1 A0 = 0 ACK CO_Control Information 1 R6 T P R3 R2 R1 R0 ACK BA_Band Information B7 X B5 X B3 X B1 X ACK FM_Frequency Information (with MSB) 0 N14 N13 N12 N11 N10 N9 N8 ACK FL_Frequency Information (with LSB) N7 N6 N5 N4 N3 N2 N1 N0 ACK Chip Addresses The chip address is programmable by Pin CA. The PLL addresses C0, C2, C4, C6 are officially allocated to PLL–IC’s. The addresses C8, CA, CC, CE are not officially allocated. Care has to be taken in the application that no conflict occurs with other devices on the same I2C Bus when using the addresses C8 to CE. CA Pin (13) A3 A2 A1 A0 Address Function –0.04 VCC1 to 0.1 VCC1 0 0 0 0 0 1 0 0 C0 C2 1st PLL 1st DAC Open or 0.2 VCC1to0.3VCC1 0 0 1 1 0 1 0 0 C4 C6 2nd PLL 2nd DAC 0.42 VCC1 to 0.75 VCC1 1 1 0 0 0 1 0 0 C8 CA 3rd PLL 3rd DAC 0.9 VCC1 to 1.2 VCC1 1 1 1 1 0 1 0 0 CC CE 4th PLL 4th DAC PLL SECTION Data Format and Bus Receiver The circuit receives the information for tuning and control via I2C Bus. The incoming information is treated in the bus receiver. The definition of the permissible bus protocol is shown in the four examples below: Ex. 1 STA CA1 CO BA STO Ex. 2 STA CA1 FM FL STO Ex. 3 STA CA1 CO BA FM FL STO Ex. 4 STA CA1 FM FL CO BA STO STA = Start Condition STO = Stop Condition CA1 = Chip Address Byte of the PLL Section 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 6 shows the five bytes of information that are needed for circuit operation: there is a chip address, two bytes of control and band information and two bytes of frequency information. |
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