MC44829 Datasheet, PDF (6/10 Pages) Motorola, Inc – TV AND VCR I2C PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND MIX/OSC DECODER

MC44829
Figure 5 shows the five bytes of information that are
needed for circuit operation: there is the chip address, two
bytes of control and band information and two bytes of
frequency information.
After the chip address, two or four data bytes may be
received: if three data bytes are received the third data byte
is ignored.
If five or more data bytes are received the fifth and
following data bytes are ignored and the last acknowledge
pulse is sent at the end of the fourth data byte.
The first and the third data bytes contain a function bit
which allows the IC to distinguish between frequency
information and control plus band information.
Frequency information is preceded by a Logic “0”. If the
function bit is Logic “1” the two following bytes contain control
and band information. The first data byte, shifted after the
chip address, may be byte CO or byte FM.
The two permissible bus protocols with five bytes are
shown in Figure 5.
The Data and Clock inputs (Pins 10 and 11) are high
impedance when the supply voltage VCC1 is between 0 and
5.5 V.
Chip Address
The chip address is programmable by Pin 9 (CA – Address
Select).
CA – Pin 9
Address (HEX.)
–0.04 VCC1 to 0.1 VCC1
C0
Open or 0.2 VCC1 to 0.3 VCC1
C2
0.42 VCC1 to 0.75 VCC1
C4
0.9 VCC1 to 1.2 VCC1
C6
CA_Chip Address
CO_Information
BA_Band Information
FM_Frequency Information
FL_Frequency Information
CA_Chip Address
FM_Frequency Information
FL_Frequency Information
CO_Information
BA_Band Information
Figure 5. Definition of Bytes
ÉÉÉɹ ÉÉÉɹÉÉÉÉÉÉ⁰ ÉÉÉÉ⁰ÉÉÉÉÉÉ⁰ ÉÉÉÉ^0/1ÉÉÉÉ⁰ÉÉ^/1 ÉÉÉÉ⁰ÉÉÉÉ^AÉÉ^CK ÉÉ
ÉÉÉÉ^1X ÉÉÉÉ^TB1ÉÉ⁶⁴ ÉÉÉÉ^TB153ÉÉÉÉ^TB1ÉÉ⁴² ÉÉÉÉ^TX11ÉÉÉÉ^TX1ÉÉ⁰ ÉÉÉÉ^TX9 ÉÉÉÉ^TX8ÉÉÉÉ^AAÉÉ^CCKK ÉÉ
0
N14
N13
N12
N11
N10
N9
N8
ACK
N7
N6
N5
N4
N3
N2
N1
N0
ACK
ÉÉÉɹ ÉÉÉɹÉÉÉÉÉÉ⁰ ÉÉÉÉ⁰ÉÉÉÉÉÉ⁰ ÉÉÉÉ^0/1ÉÉÉÉ⁰ÉÉ^/1 ÉÉÉÉ⁰ÉÉÉÉ^AÉÉ^CK ÉÉ
0
N14
N13
N12
N11
N10
N9
N7
N6
N5
N4
N3
N2
N1
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ ¹
T14
T13
T12
T11
T10
T9
N8
ACK
N0
ACK
T8
ACK
X
B6
B5
B4
X
X
X
X
ACK
6
MOTOROLA ANALOG IC DEVICE DATA