WM8321 Datasheet, PDF (189/253 Pages) Wolfson Microelectronics plc – Processor Power Management Subsystem

Production Data
WM8321
REGISTER
ADDRESS
R16470
(4056h) DC1
Control 1
BIT
15:14
12
9:8
7
5:4
1:0
LABEL
DEFAULT
DESCRIPTION
DC1_RATE
[1:0]
10
DC-DC1 Voltage Ramp rate
00 = 1 step every 32us
01 = 1 step every 16us
10 = 1 step every 8us
11 = Immediate voltage change
DC1_PHASE
0
DC-DC1 Clock Phase Control
0 = Normal
1 = Inverted
DC1_FREQ
[1:0]
00
DC-DC1 Switching Frequency
00 = Reserved
01 = 2.0MHz (2.2uH output inductor)
10 = 4.0MHz (1uH output inductor)
11 = 4.0MHz (0.5uH output inductor)
This field can only be written to by loading configuration
settings from OTP/ICE. In all other cases, this field is
Read Only.
DC1_FLT
0
DC-DC1 Output float
0 = DC-DC1 output discharged when disabled
1 = DC-DC1 output floating when disabled
DC1_SOFT_ST
00
DC-DC1 Soft-Start Control
ART [1:0]
(Duration in each of the 8 startup current limiting steps.)
00 = 32us steps
01 = 64us steps
10 = 128us steps
11 = 256us steps
DC1_CAP [1:0]
00
DC-DC1 Output Capacitor
00 = 4.7uF to 20uF
01 = Reserved
10 = 22uF to 47uF
11 = Reserved
This field can only be written to by loading configuration
settings from OTP/ICE. In all other cases, this field is
Read Only.
REFER TO
Register 4056h DC1 Control 1
REGISTER
ADDRESS
R16471
(4057h) DC1
Control 2
BIT
15:14
12:11
10
9:8
LABEL
DC1_ERR_AC
T [1:0]
DC1_HWC_SR
C [1:0]
DC1_HWC_VS
EL
DC1_HWC_M
ODE [1:0]
DEFAULT
DESCRIPTION
00
DC-DC1 Error Action (Undervoltage)
00 = Ignore
01 = Shut down converter
10 = Shut down system (Device Reset)
11 = Reserved
Note that an Interrupt is always raised.
00
DC-DC1 Hardware Control Source
00 = Disabled
01 = Hardware Control 1
10 = Hardware Control 2
11 = Hardware Control 1 or 2
0
DC-DC1 Hardware Control Voltage select
0 = Set by DC1_ON_VSEL
1 = Set by DC1_SLP_VSEL
11
DC-DC1 Hardware Control Operating Mode
00 = Forced Continuous Conduction Mode
01 = Disabled
10 = LDO Mode
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REFER TO
PD, February 2012, Rev 4.0
189