MAS 35x9F
DATA SHEET
4.3. Pin Descriptions
VSENS1/VSENS2
IN
Sense input and power output of DC/DC converters. If
the respective DC/DC converter is not used, this pin
should be connected to a supply to enable proper
function of the PUP-signals.
4.3.1. Power Supply Pins
The use of all power supply pins is mandatory to
achieve correct function of the MAS 35x9F.
DCEN
IN
VDD, VSS
Digital supply pins.
SUPPLY
SUPPLY
SUPPLY
Enable signal for both DC/DC converters. If none of
the DC/DC converters is used, this pin must be con-
nected to VSS.
XVDD, XVSS
Supply for digital output pins.
PUP
OUT
Power-up. This signal is set when the required volt-
ages are available at both DC/DC converter output
pins VSENS1 and VSENS2. The signal is cleared
when both voltages have dropped below the reset
level in the DCCF Register.
I2CVDD
2
Supply for I C interface circuitry. This net uses VSS or
XVSS as the ground return line.
PVDD
SUPPLY
Auxiliary pin for analog circuitry. This pin has to be
connected via a 3 nF capacitor to AVDD1. Extra care
should be taken to achieve a low-inductance PCB line.
VBAT
IN
Analog input for battery voltage supervision.
AVDD0/AVSS0
SUPPLY
4.3.4. Oscillator Pins and Clocking
Supply for analog output amplifier.
XTI
XTO
IN
OUT
AVDD1/AVSS1
SUPPLY
Supply for internal analog circuits (A/D, D/A convert-
ers, clock, PLL, S/PDIF input).
The XTI pin is connected to the input of the internal
crystal oscillator, the XTO pin to its output. Each pin
should be directly connected to the crystal and to a
ground-connected capacitor (see application diagram,
Fig. 5–1 on page 89).
AVDD0/AVSS0 and AVDD1/AVSS1 should receive the
same supply voltages.
CLKO
OUT
4.3.2. Analog Reference Pins
The CLKO can drive an output clock line.
AGNDC
Internal analog reference voltage. This pin serves as
the internal ground connection for the analog circuitry.
4.3.5. Control Lines
I2CC
I2CD
SCL
SDA
IN/OUT
IN/OUT
VREF
2
Analog reference ground. All analog inputs and out-
puts should drive their return currents using separate
traces to a ground starpoint close to this pin. Connect
to AVSS1. This reference pin should be as noise-free
as possible.
Standard I C control lines.
DVS
IN
2
I C device address selector. Connect this pin either to
2
2
VDD (I C device address: 3E/3F ) or VSS (I C
device address: 3C/3D ) to select a proper I C
hex
2
hex
device address (see also Table 3–2 on page 23).
4.3.3. DC/DC Converters and
Battery Voltage Supervision
4.3.6. Parallel Interface Lines
DCSG1/DCSG2
SUPPLY
DC/DC converters switch ground. Connect using sep-
arate wide trace to negative pole of battery cell. Con-
nect also to AVSS0/1 and VSS/XVSS, VREF.
PI12..PI19
IN/OUT
The PIO input pins PI12..PI19 are used as 8-bit I/O
interface to a microcontroller in order to transfer com-
pressed and uncompressed data. PI12 is the LSB,
PI19 the MSB.
DCSO1/DCSO2
SUPPLY
DC/DC converter switch connection. If the respective
DC/DC converter is not used, this pin must be left
vacant.
60
June 30, 2004; 6251-505-1DS
Micronas
MICRONAS [ MICRONAS ]
