MAS3549F View Datasheet(PDF) - Micronas
Part Name
Description
MFG CO.
MAS3549F Datasheet PDF : 92 Pages
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DATA SHEET
MAS 35x9F
Table 3–3: Direct configuration registers, continued
I2C Sub-
address
(hex)
76
Function
DCCF Register (reset = 5050hex)
DC/DC Converter 2
bit[15]
PUP2: Voltage monitor 2 flag (readback)
bit[14:11] Converter 2 output voltage with respect to VREF2)
Code
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
01001)
00111)
00101)
Nominal set level
output volt. of PUP2
3.5 V
3.4 V
3.4 V
3.3 V
3.3 V
3.2 V
3.2 V
3.1 V
3.1 V
3.0 V
3.0 V
2.9 V
2.9 V
2.8 V
2.8 V
2.7 V
2.7 V
2.6 V
2.6 V
2.5 V
2.5 V
2.4 V
2.4 V
2.3 V
2.3 V
2.2 V
2.2 V
2.1 V
reset level
of PUP2
3.3 V
3.2 V
3.1 V
3.0 V
2.9 V
2.8 V (reset)
2.7 V
2.6 V
2.5 V
2.4 V
2.3 V
2.2 V
2.1 V
2.0 V
bit[10]
Mode
1
0
pulse frequency modulation (PFM)
pulse width modulation (PWM) (reset)
bit[9:8]
Reserved, must be set to zero
The DC/DC converters are up-converters only. Thus, if the battery voltage is
higher than the selected nominal voltage, the output voltage will exceed the
nominal voltage.
Name
DCCF
DC/DC Converter 1
bit[7]
PUP1: Voltage monitor 1 flag (readback)
bit[6:3]
Converter 1 output voltage at VSENS1 with respect to VREF
(see bits 14 to 11)2)
bit[2]
Mode
1
0
pulse frequency modulation (PFM)
pulse width modulation (PWM) (reset)
bit[1:0]
Reserved, must be set to zero
Note, that the reference voltage for DC/DC converter 1 is derived from the
main reference source supplied via pin AVDD1. Therefore, if this DC/DC con-
verter is used, its output must be connected to the analog supply.
The DC/DC converters are up-converters only. Thus, if the battery voltage is
higher than the selected nominal voltage, the output voltage will exceed the
nominal voltage.
1) refer to Section 4.3.3. on page 60
2) refer to Section 2.11.2.1.
Micronas
June 30, 2004; 6251-505-1DS
25
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