Maxim-integrated MAXQ7667 Manual de usuario descargar pdf (Pagina 280)

16.5.2 Digital I/O Supply (DVDDIO) Monitor

The DVDDIO monitor detects a brownout condition on the +5V digital I/O supply. The DVDDIO supply monitor can be independently

activated by setting to 1 the VIBE bit in the APE register. A brownout is detected when the DVDDIO supply voltage falls below the pro-

grammed DVDDIO brownout detection threshold (see Figure 16-8). When using the internal voltage regulators, the DVDDIO brownout

interrupt provides the earliest warning of a loss of power event. If enabled, a DVDDIO brownout interrupt can be generated. When using

the internal voltage regulators, the DVDDIO brownout interrupt provides the earliest warning of a loss of power event. A DVDDIO

brownout interrupt is generated only if the interrupt enable bit (VIBIE) in the AIE register is set. Also, global interrupt mask bits IM5 (in

the IMR register) and IGE (in the IC register) must be enabled.

16.5.3 Analog Supply Voltage (AVDD) Monitor

The AVDD monitor detects a brownout condition on the +3.3V analog I/O supply. The AVDD supply monitor can be independently acti-

vated by setting the VABE bit in the APE register. A brownout is detected when the AVDD supply voltage falls in the programmed AVDD

brownout detection threshold (Figure 16-9). An AVDD brownout interrupt is generated only if the interrupt enable bit (VABIE) in the AIE

register is set. Also, global interrupt mask bits IM5 (in the IMR register) and IGE (in the IC register) must be enabled.

_________________________________________________________________________________________________________ 16-14

MAXQ7667 User’s Guide

Figure 16-9. AVDD Brownout Interrupt Threshold Detection

NOMINAL AVDD

(+3.3V)

AVDD

BROWNOUT

INTERRUPT

AVDD INTERRUPT

THRESHOLD

(3.0V TO 3.15V)



AVLVL

Figure 16-8. DVDDIO Brownout Interrupt Threshold Detection

NOMINAL DVDDIO

(+5.0V)

DVDDIO

BROWNOUT

INTERRUPT

VIOLVL

DVDDIO INTERRUPT

THRESHOLD

(4.5V TO 4.75V)

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Maxim-integrated MAXQ7667 Manual de usuario Pagina 280