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MCP3464 데이터시트(PDF) 75 Page - Microchip Technology

부품명 MCP3464
상세설명  Two/Four/Eight-Channel, 153.6 ksps, Low Noise, 16-Bit Delta-Sigma ADC
PDF  108 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3464 데이터시트(HTML) 75 Page - Microchip Technology

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 2019-2021 Microchip Technology Inc.
DS20006180D-page 75
MCP3461/2/4
6.8.3.3
IRQ Pin State
A logic low state is generated on the IRQ pin as soon
as the AVDD or DVDD monitoring circuits detect a power
supply drop below their specified threshold.
This POR interrupt can only be cleared when both
AVDD and DVDD are above their monitoring voltage
thresholds. When this condition is met, the POR
threshold is cleared by the CS falling edge. This means
that if a CS falling edge does not clear the IRQ pin
state, the POR event is still in effect.
This feature can be used by the user to know exactly
when the chip has powered up by polling with the CS
pin and checking the IRQ pin state at power-up. See
Figure 6-16 for more details.
Since this is a high-level priority interrupt, this POR
interrupt can happen at all times, even when MDAT is
enabled. In this case, having a constant logic low bit
stream can indicate in this case a probable POR event
(or a fully negative ADC saturation output code induced
by a large negative input voltage).
FIGURE 6-16:
POR IRQ Timing Diagram.
IRQ
High-Z
0
DVDD
AVDD
tPOR
V POR_A,
CS
Clears POR Interrupt
Chip Select
Starts Low
POR
Internal State
Don’t Care
tCSIRQ
V POR_D



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