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AFE4490 데이터시트(PDF) 37 Page - Texas Instruments

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부품명 AFE4490
상세설명  Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters
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AFE4490 데이터시트(HTML) 37 Page - Texas Instruments

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AFE4400
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SBAS601D – DECEMBER 2012 – REVISED MAY 2013
Diagnostics Module
The diagnostics module, when enabled, checks for nine types of faults sequentially. The results of all faults are latched in 11 separate flags. At the end of
the sequence, the state of the 11 flags are combined to generate two interrupt signals: PD_ALM for photodiode-related faults and LED_ALM for transmit-
related faults. The status of all flags can also be read using the SPI interface. Table 3 details each fault and flag used. Note that the diagnostics module
requires all AFE blocks to be enabled in order to function reliably.
Table 3. Fault and Flag Diagnostics(1)
MODULE
SEQ.
FAULT
FLAG1
FLAG2
FLAG3
FLAG4
FLAG5
FLAG6
FLAG7
FLAG8
FLAG9
FLAG10
FLAG11
—
—
No fault
0
0
0
0
0
0
0
0
0
0
0
Rx INP cable shorted to LED
1
1
cable
Rx INM cable shorted to LED
2
1
cable
PD
Rx INP cable shorted to GND
3
1
cable
Rx INM cable shorted to
4
1
GND cable
5
PD open or shorted
1
1
Tx OUTM line shorted to
6
1
GND cable
Tx OUTP line shorted to
7
1
LED
GND cable
8
LED open or shorted
1
1
9
LED open or shorted
1
(1)
Resistances below 10 k
Ω are considered to be shorted.
Copyright © 2012–2013, Texas Instruments Incorporated
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