TDA8261TW Philips Semiconductors, TDA8261TW Datasheet - Page 9

• Manufacturer Part Number: TDA8261TW
• Description: Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
I
If bit R/W = 1 the data can be read from the TDA8261TW
(see Table 7). After recognition of its slave address, the
TDA8261TW generates an acknowledge pulse and
transfers the status byte onto the SDA line (MSB first).
Data is valid on the SDA line when the SCL clock signal is
HIGH.
A second data byte can be read from the TDA8261TW if
the microcontroller generates an acknowledge on the SDA
line. End of transmission will occur if no acknowledge is
received from the microcontroller. The TDA8261TW will
Table 7 I
Notes
1. X can be 1 or 0 and needs to be masked in the microcontrollers’ software; MSB is transmitted first.
2. Acknowledge bit (A).
3. FL is valid only in normal mode.
P
At power-on (bit POR = 1) or when the supply voltage drops below 2.7 V, internal registers are set according to Table 8.
Table 8 Status at POR
Note
1. X = not set.
2004 Dec 02
2
Address
Status byte
Programmable divider 1 (PD1)
Programmable divider 2 (PD2)
Control data 1 (CD1)
Control data 1 (CD2)
C-bus read mode
OWER
Satellite Zero-IF QPSK/8PSK
downconverter with PLL synthesizer
-O
N
2
C-bus read data format
R
ESET
BYTE
BYTE
N7 = X
C1 = X
MSB
POR
MSB
1
0
1
N14 = X
FL
N6 = X
C0 = X
T2 = 0
1
(3)
N13 = X
N5 = X
T1 = 0
X
0
X
9
then release the data line to allow the microcontroller to
generate a STOP condition.
The POR flag is set to logic 1 at power-on and when
V
condition is detected by the TDA8261TW (end of a read
sequence).
The in-lock flag FL indicates that the loop is phase-locked
when set to logic 1.
When a read sequence is started, all eight bits of the status
byte must be read.
CC
X
0
N12 = X
< 2.7 V. It is reset to logic 0 when an end-of-data
N4 = X
T0 = 1
BITS
X
BITS
(1)
X
0
N11 = X
(1)
N3 = X
R2 = X
X
MA1
X
N10 = X
N12 = X
R1 = X
X
MA0
X
TDA8261TW
Product specification
N9 = X
N1 = X
R0 = X
X
LSB
X
1
N8 = X
N0 = X
ACK
LSB
X
X
A
(2)