ADG5436F datasheet(29/30 Pages) AD

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Data Sheet

ADG5436F

Rev. B | Page 29 of 30

INTELLIGENT FAULT DETECTION

The ADG5436F digital output pin, FF, can interface with a

microprocessor or control system and can be used as an

interrupt flag. This feature provides real-time diagnostic

information on the state of the device and the system to

which it connects.

The control system can use the digital interrupt, FF, to start a

variety of actions, as follows:

•

Initiating an investigation into the source of an overvoltage

fault.

•

Shutting down critical systems in response to the overvoltage

condition.

•

Using data recorders to mark data during these events as

unreliable or out of specification.

For systems sensitive during a start-up sequence, the active low

operation of the flag allows the system to ensure that the

ADG5436F is powered on and that all input voltages are within

the normal operating range before initiating operation.

The FF pin is a weak pull-up, which allows the signals to

combine into a single interrupt for larger modules that contain

multiple devices.

The recovery time, tDIGREC, can be decreased from a typical 60 µs

to 600 ns by using a 1 kΩ pull-up resistor.

The specific fault digital output, SF decodes which inputs are

experiencing a fault condition. The SF pin reduces to below

0.8 V when a fault condition is detected on a specific pin,

depending on the state of F1 and F2 (see Table 9). The specific

fault feature also works with the switches disabled (EN pin low),

which allows the user to cycle through and check the fault

conditions without connecting the fault to the drain output.

LARGE VOLTAGE, HIGH FREQUENCY SIGNALS

Figure 29 shows the voltage range and frequencies that the

ADG5436F can reliably convey. For signals extending across the

full signal range from VSS to VDD, keep the frequency below 3 MHz.

If the required frequency is greater than 3 MHz, decrease the signal

range appropriately to ensure signal integrity.

ADG5436F Datasheet(PDF) 29 Page - Analog Devices

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