WM8945
Production Data
DESCRIPTION
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
R17 (11h)
15
TEMP_STS
0
Thermal Sensor status
0 = Normal
Status Flags
1 = Overtemperature
Thermal Shutdown enable
0 = Disabled
R42 (2Ah)
Output ctrl
THERR_ACT
15
1
1 = Enabled
When THERR_ACT = 1, then an
overtemperature condition will
cause the speaker outputs to be
disabled.
Table 69 Thermal Shutdown Control
POWER ON RESET
The WM8945 includes a Power-On Reset (POR) circuit, which is used to reset the digital logic into a
default state after power up. The POR circuit derives its output from LDOVDD and DCVDD. The
internal P¯O¯¯R signal is asserted low when either LDOVDD or DCVDD are below minimum thresholds.
The specific behaviour of the circuit will vary, depending on relative timing of the supply voltages.
Typical scenarios are illustrated in Figure 48 and Figure 49.
Figure 48 Power On Reset Timing – LDOVDD enabled first
PD, May 2011, Rev 4.1
104
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
