PRELIMINARY DATA SHEET
4.3.3. Control Lines
I2CC
I2CD
SCL
SDA
IN/OUT
IN/OUT
4.3. Pin Descriptions
4.3.1. Power Supply Pins
Connection of all power supply pins is mandatory for
the function of the MAS 3506D.
VDD
VSS
SUPPLY
SUPPLY
Standard I
2
C control lines. Normally there are pull-up
resistors from each line to VDD.
4.3.4. Parallel Interface Control Lines
The VDD/VSS pair is internally connected with all digi-
tal modules of the MAS 3506D.
XVDD
XVSS
SUPPLY
SUPPLY
PR
PCS
RTR
RTW
EOD
IN
IN
OUT
OUT
OUT
The XVDD/XVSS pins are the supply lines for the pin
output buffers.
AVDD
AVSS
SUPPLY
SUPPLY
PIO handshake lines. Their use depends on the actual
firmware on the MAS 3506D. Usage of these lines in
the standard WorldSpace configuration is not planned.
4.3.5. Parallel Interface Data Lines
The AVDD/AVSS pair is internally connected with the
analog blocks of the MAS 3506D, i.e. clock synthe-
sizer and supply voltage supervision circuits.
General purpose Parallel IO pins. The information of
the input and output signals may also be read from
Register c8
hex
(please refer to Table 3–10 in Section
PI19
BC-FRAME-TOGGLE
OUT
4.3.2. DC/DC Converter Pins
DCEN
DC/DC ENABLE
IN
The DCEN input signal starts and enables the DC/DC
converter operation.
DCSG
SUPPLY
The BC-FRAME-TOGGLE output toggles its state after
each correctly decoded Broadcast Channel Frame
(432 ms). This pin can be used for monitor the proper
function of the system.
PI18
BCINENABLE
IN
The DC converter Signal Ground pin is used as a
basepoint for the internal switching transistor of the
DC/DC converter. It must always be connected to
ground.
DCSO
OUT
PI18 is used as input pin to sense the status of the
BCINENABLE line at the WorldSpace connector. On
low input level the alternative BC-input lines SIC*, SII*
and SID* are activated and SIC, SII, SID are deacti-
vated.
PI17
PI16
PI15
PI14
RESERVED
SIC*
SII*
SID*
IN/OUT
IN
IN
IN
DCSO is an open drain output and should be con-
nected with external circuitry (inductor/diode) to start
the DC/DC converter. When the DC/DC converter is
not used, it has to be connected to VSS.
VSENS
IN
The VSENS pin is the input for the DC/DC converter
feedback loop. It must be connected directly with the
Schottky diode and the capacitor as shown in Fig. 2–5
When the DC/DC converter is not used, it has to be
connected to VDD.
The SIC*, SID*, and SII* may be configured as alterna-
tive serial input lines in order to support alternative
serial digital sources. SID* (PI14) is used as Broadcast
Channel data input from the Broadcast Channel I/O
interface.
Micronas
33
MICRONAS [ MICRONAS ]
