U2739M-BFC ATMEL [ATMEL Corporation], U2739M-BFC Datasheet - Page 16

• Manufacturer Part Number: U2739M-BFC
• Description: DAB One-Chip Channel- and Source Decoder
• Manufacturer: ATMEL [ATMEL Corporation]

6.3
6.3.1
6.3.2
In order to implement a flexible AGC concept of a DAB
receiver the signals W_AGC and SLI can be used to
control the tuner IC U2731B. The influence of W_AGC
and SLI to the RF AGC voltage generation block is
described in the U2731B preliminary datasheet.
The WAGC signal must be controlled by the MC by using
6.4
6.4.1
6.4.2
The MC interface is used for data transmission between
the U2739M-B (slave) and an external microcontroller
(master). It can be configured for L3- or I2C protocol
depending on the status of the MC_MODE line during
reset (/RS = LOW):
MC_MODE = HIGH
MC_MODE = LOW
The MCM_TRIGGER line indicates the status of the
internal interface controller.
U2739M-B
16 (69)
QFP144 QFP100
QFP144 QFP100
27
28
72
73
74
75
Tuner Interface
MC Interface
Tuner Interface Signal Description
Tuner Interface Description
MC Interface Signal Description
MC Interface Description
19
20
50
51
52
53
MCM_TRIGGER
MC_MODE
MC_CLK
MC_DAT
Pin Name
W_AGC
V
V
Pin Name
SLI
L3 bus selected
I2C bus selected
Window AGC
0 during COFDM symbols
1 during the NULL symbol
Synchronization lock indicator
0 receiver synchronization not locked
1
receiver synchronization locked
MCM trigger signal
Microcontroller mode signal
0 I2C bus protocol
1 L3 bus protocol
Microcontroller clock signal
Microcontroller data signal
Signal Description
Signal Description
the set WAGC configuration MC command. The WAGC
signal does not follow the moving FFT window. The
rising and falling edge can be adjusted by the MC. The
MC can use the differential dT, which correspond to the
FFT window shift, from the read synchronization status
command to adjust the WAGC rising and falling edge.
The external MCU is able to communicate with the
U2739M-B during LOW phases of MCM_TRIGGER
only !
Further the MCM trigger signal indicates the synchro-
nization status. If the MCM trigger has period of 8 ms,
then the U2739M-B is not locked. In the synchronized
(‘locked’) state the MCM trigger period correspond to the
CIF frame, which is provided every 24 ms. The complete
FIC is processed at the beginning of the transmission
frame.
PRO04T
PRO04T
PRO04T
PDIZ
PDIZ
PRB04TZ
Pad Type
Pad Type
Rev. A1, 22-May-01
inout
Dir.
Dir.
out
out
out
in
in
5 V Tol.
5 V Tol.
x
x
x