5.6.4.18 DCDC4 Register (subaddress = 0x19) [reset = 0xB2]
DCDC4 is shown in Figure 5-53 and described in Table 5-25.
Return to Summary Table.
Note 1: This register is password protected. For more information, see Section 5.6.1.
Note 2: A 5-ms blanking time of the overvoltage and undervoltage monitoring occurs when a write is performed on the DCDC4 register.
NOTE
Power-up default may differ depending on RSEL value. See Section 5.3.1.13 for details. The Reserved setting should not be selected and the output voltage settings should not be modified while the converter is operating.
Figure 5-53 DCDC4 Register
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
PFM |
RESERVED |
DCDC4 |
R/W-1b |
R-0b |
R/W-32h |
Table 5-25 DCDC4 Register Field Descriptions
Bit |
Field |
Type |
Reset |
Description |
7 |
PFM |
R/W |
1b |
Pulse Frequency Modulation (PFM, also known as pulse-skip-mode) enable. PFM mode improves light-load efficiency. Actual PFM mode operation depends on load condition.
0b = Disabled (forced PWM)
1b = Enabled
|
6 |
RESERVED |
R |
0b |
|
5-0 |
DCDC4 |
R/W, E2 |
32h |
DCDC4 output voltage setting
0h = 1.175
1h = 1.200
2h = 1.225
3h = 1.250
4h = 1.275
5h = 1.300
6h = 1.325
7h = 1.350
8h = 1.375
9h = 1.400
Ah = 1.425
Bh = 1.450
Ch = 1.475
Dh = 1.500
Eh = 1.525
Fh = 1.550
10h = 1.600
11h = 1.650
12h = 1.700
13h = 1.750
14h = 1.800
15h = 1.850
16h = 1.900
17h = 1.950
18h = 2.000
19h = 2.050
1Ah = 2.100
1Bh = 2.150
1Ch = 2.200
1Dh = 2.250
1Eh = 2.300
1Fh = 2.3500
20h = 2.400
21h = 2.450
22h = 2.500
23h = 2.550
|
|
|
|
|
24h = 2.600
25h = 2.650
26h = 2.700
27h = 2.750
28h = 2.800
29h = 2.850
2Ah = 2.900
2Bh = 2.950
2Ch = 3.000
2Dh = 3.050
2Eh = 3.100
2Fh = 3.150
30h = 3.200
31h = 3.250
32h = 3.300
33h = 3.350
34h = 3.400
35h = reserved
36h = reserved
37h = reserved
38h = reserved
39h = reserved
3Ah = reserved
3Bh = reserved
3Ch = reserved
3Dh = reserved
3Eh = reserved
3Fh = reserved
|