WM8983GEFL/V Wolfson Microelectronics, WM8983GEFL/V Datasheet - Page 78

• Manufacturer Part Number: WM8983GEFL/V
• Description: Audio CODECs Mbl Multimedia CODEC w/ 1W Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8983GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8983
w
ENABLING THE OUTPUTS
Table 51 Output Stages Power Management Control
THERMAL SHUTDOWN
Table 52 Thermal Shutdown
Each analogue output of the WM8983 can be independently enabled or disabled. The analogue
mixer associated with each output has a separate enable bit. All outputs are disabled by default. To
save power, unused parts of the WM8983 should remain disabled.
Outputs can be enabled at any time, but it is not recommended to do so when BUFIO is disabled
(BUFIOEN=0), as this may cause pop noise (see “Power Management” and “Applications
Information” sections).
OUT1DEL and OUT2DEL enable lower pop noise power-up option. See start–up sequences. (in 2
stage enable method, normal enable bit is set, followed shortly later by the delayed enable DELEN)
To protect the WM8983 from overheating a thermal shutdown circuit is included. If the device
temperature reaches approximately 125
the L/ROUT2 amplifiers will be disabled. The thermal shutdown may also be configured to generate
an interrupt. See the GPIO and Interrupt Controller section for details.
R1
Power
Management
1
R2
Power
Management
2
R3
Power
Management
3
R42
Output ctrl1
Note: All “Enable” bits are 1 = ON, 0 = OFF
R49
Output Control
REGISTER
ADDRESS
REGISTER
ADDRESS
2
6
7
8
8
7
6
2
3
5
6
7
8
1
0
BIT
1
BIT
BUFIOEN
OUT3MIXEN
OUT4MIXEN
BUFDCOPEN
ROUT1EN
LOUT1EN
SLEEP
LMIXEN
RMIXEN
ROUT2EN
LOUT2EN
OUT3EN
OUT4EN
DELEN
OUT1DEL
TSDEN
LABEL
LABEL
0
C and the thermal shutdown circuit is enabled (TSDEN=1)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
DEFAULT
DEFAULT
Unused input/output bias buffer enable
OUT3 mixer enable
OUT4 mixer enable
Output stage 1.5xAVDD/2 driver enable
ROUT1 output enable
LOUT1 output enable
0 = Normal device operation
1 = Supply current reduced in device
standby mode if clocks are still running
Left mixer enable
Right mixer enable
ROUT2 output enable
LOUT2 output enable
OUT3 enable
OUT4 enable
2
2 stage enable for L/ROUT1
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
nd
enable bit for L/ROUT1
DESCRIPTION
DESCRIPTION
PD, Rev 4.3, May 2010
Production Data
78