AS3543_11 Datasheet, PDF (47/92 Pages) ams AG – High End Stereo Audio Codec wi th System PMU

AS3543 3v2
Data Sheet - Detailed Description - SYSTEM Functions
10.3 Supervisor
10.3.1 General
This supervisor function can be used for automatic detection of BVDD brown out or junction over-temperature condi-
tion.
10.3.2 BVDD Supervision
The BVDD supervision interrupt level is set to 175mV above regulator output AVDD27. When BVDD reaches this level
an interrupt can be generated.
lid ^{If AVDD27 reaches the “programmed level of AVDD27” -10% for more than 680us, the AFE shuts down automatically,}
if the shutdown is not disabled.
10.3.3 Junction Temperature Supervision
a _{The temperature supervision level can also be set by 5 bits (120 to –15ºC). If the temperature reaches this level, an}
interrupt can be generated. The over-temperature shutdown level is always 20ºC higher.
v _{10.3.4 Power Rail Monitoring}
ill ^{The 4 main regulators as well as the DCDC15 booster and the system supply AVDD27 have an extra monitor which}
observes the output voltage of the regulators. This power rail monitors are independent from the 10bit ADC. To activate
these please see related registers. For a shut down the voltage of the regulator has to be 10% or more below the pro-
t _{grammed value for more than 680us.}
G _{s 10.3.5 Register Description}
Table 34. Supervisor Related Register
A ^t _Name
Base
s ^{n SUPERVISOR}
2-wire serial
e _{IRQENRD_0}
m ^{t IRQENRD_1}
a ^{n IRQENRD_2}
IRQENRD_3
o _{IRQENRD_4}
2-wire serial
2-wire serial
2-wire serial
2-wire serial
2-wire serial
Offset
21h
23h
24h
25h
26h
27h
Description
Low battery shutdown disable and junction temperature
supervision threshold levels
Enable/disable PVDD/CVDD monitoring interrupt and shutdown
Enable/disable PVDD/CVDD monitoring interrupt and shutdown
Enable/disable battery brown out interrupt
Enable/disable junction temperature interrupt
Enable/disable AVDD27 and DCDC15 monitoring interrupt
c _{10.4 Interrupt Generation}
l _{10.4.1 General}
a _{All interrupt sources can get enabled or disabled by corresponding bits in the 5 IRQ-bytes. By default no interrupt}
source is enabled.
ic The XIRQ output can be configured to operate in push/pull (2 different driver strengths), open-drain mode or to be tri-
state. The signal polarity can be defined as active-low or active-high. Default state is open-drain active-low. For a more
n ^{detailed description of the GPIO functionality of this pin please refer to chapter GPIO Pins on page 50.}
10.4.2 IRQ Source Interpretation
h _{There are 3 different modules to process interrupt sources:}
c _LEVEL
e The IRQ output is kept active as long as the interrupt source is present and this IRQ-Bit is enabled
T^EDGE
The IRQ gets active with a high going edge of this source. The IRQ stays active until the corresponding IRQ-Register
gets read.
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