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MAS35X9F View Datasheet(PDF) - Micronas

Part Name
Description
MFG CO.
'MAS35X9F' PDF : 92 Pages View PDF
DATA SHEET
2.11.2.1.Important Advice for Turn-on and Operat-
ing Voltage
Before the 2.2 V are programmed at the DCDC con-
verter, DSP+Codec must be enabled.
Operating and Turn-Off is possible down to 2.2 V.
The sequence should be similar to the following:
1. Start DCDC
2. Set DCDC to 2.5 V
Turn on DSP+Codec
Write App-Select memory cell
Read App-Running Mem cell
If okay: Set DCDC to 2.2 V
Set other mem cells
Set other codec registers
.....
3. Demute...send data
4. Mute...stop data.....loop "3)" "4)"...
5. Turn off DSP+Codec
goto "2)"
etc.....
The signal at pin PUP will return to low only when both
PUPn flags (I2C subaddress 76hex) have returned to
zero. Care must be taken when changing both DC/DC
output voltages to higher values. In this case, both out-
put voltages are momentarily insufficient to keep the
PUPn flags up; the resulting dip in the signal at the
PUP pin may, in turn, reset the microcontroller. To
avoid this condition, only one DC/DC output voltage
should be changed at a time. Before modifying the
second voltage, the microcontroller must wait for the
PUPn flag of the first voltage to be set again.
If only DC/DC converter 1 is used, the reference volt-
age of the second, unused converter should be set to
a lower value than that of converter 1, and its pin
VSENS2 should be connected to VDD.
The operating mode pulse width modulation, or pulse
frequency modulation, are controlled at I2C subad-
dress 76hex, the operating frequency at I2C subad-
dress 77hex.
MAS 35x9F
Micronas
June 30, 2004; 6251-505-1DS
19
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