AMC1302 datasheet(21/36 Pages) TI1

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AMC1302-Q1

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SBAS920 – OCTOBER 2018

Product Folder Links: AMC1302-Q1

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Feature Description (continued)

7.3.3 Fail-Safe Output

The AMC1302-Q1 offers a fail-safe output that simplifies diagnostics on a system level. The fail-safe output is

active in two cases:

•

When the high-side supply VDD1 of the AMC1302-Q1 is missing, or

•

When the common-mode input voltage, that is VCM = (VINP + VINN) / 2, exceeds the minimum common-mode

overvoltage detection level VCMov of VDD1 – 2 V

Figure 50 and Figure 51 show the fail-safe output of the AMC1302-Q1 as a negative differential output voltage

value that does not occur under normal device operation. Use the VFAILSAFE voltage specified in the Electrical

Characteristics table as a reference value for the fail-safe detection on a system level.

Figure 50. Typical Negative Clipping Output of the

AMC1302-Q1

Figure 51. Typical Failsafe Output of the AMC1302-Q1

7.4 Device Functional Modes

The AMC1302-Q1 is operational when the power supplies VDD1 and VDD2 are applied, as specified in the

Recommended Operating Conditions table. The device does not require any specific power-supply sequence.

Consider the analog startup time tAS as defined in the Switching Characteristics table when the high-side power

supply VDD1 powers up with the low-side power supply VDD2 already operating in the specified range.

AMC1302 Datasheet(PDF) 21 Page - Texas Instruments