AS3543-ECTP datasheet(47/92 Pages) AMSCO

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AS3543 3v2

Data Sheet - D e t a i l e d D e s c r i p t i o n - S Y S T E M F u n c t i o n s

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.

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

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.

10.3.4 Power Rail Monitoring

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-

grammed value for more than 680us.

10.3.5 Register Description

10.4

Interrupt Generation

10.4.1 General

All interrupt sources can get enabled or disabled by corresponding bits in the 5 IRQ-bytes. By default no interrupt

source is enabled.

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

detailed description of the GPIO functionality of this pin please refer to chapter GPIO Pins on page 50.

10.4.2 IRQ Source Interpretation

There are 3 different modules to process interrupt sources:

LEVEL

The IRQ output is kept active as long as the interrupt source is present and this IRQ-Bit is enabled

EDGE

The IRQ gets active with a high going edge of this source. The IRQ stays active until the corresponding IRQ-Register

gets read.

Table 34. Supervisor Related Register

Name

Base

Offset

Description

SUPERVISOR

2-wire serial

21h

Low battery shutdown disable and junction temperature

supervision threshold levels

IRQENRD_0

2-wire serial

23h

Enable/disable PVDD/CVDD monitoring interrupt and shutdown

IRQENRD_1

2-wire serial

24h

Enable/disable PVDD/CVDD monitoring interrupt and shutdown

IRQENRD_2

2-wire serial

25h

Enable/disable battery brown out interrupt

IRQENRD_3

2-wire serial

26h

Enable/disable junction temperature interrupt

IRQENRD_4

2-wire serial

27h

Enable/disable AVDD27 and DCDC15 monitoring interrupt

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