ASI4U datasheet(45/64 Pages) ETC2

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ASI4U / ASI4U-E / ASI4U-F

Spec. 3.0 Compliant Universal AS-I IC

Data Sheet

April 2, 2012

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

45 of 63

3.8. Fault Indication Input Pin FID

3.8.1.

Slave Mode

The fault indication input FID is provided for sensing a periphery fault-messaging signal in Slave Mode. It

contains a high voltage high impedance input stage that influences the status bit S1 of an AS-i Slave directly.

DC properties of the pin are specified at Table 14: DC Characteristics of digital high voltage input pins.

If the FID_Invert flag (Firmware Area of the E²PROM) is not set, a periphery fault is signaled by logic HIGH at

the FID input. In this case S1 and FID are logically equivalent, which is the default state. In the opposite case,

when FID_Invert = ‘1’, the FID input value is inverted before any further processing. The FID_Invert feature

was added to provide special support for certain fault conditions.

Signal transitions at the FID pin become visible in S1 with a slight delay, because a clock synchronizing circuit

is in between.

3.8.2.

Master- and Monitor Mode

In Master- and Monitor Mode the FID input provides a voltage sense comparator for power fail detection. Its

threshold voltage is set to 2.00 V +/-3%.

A power fail event is recognized and displayed at the Parameter Pin P1 if the input voltage falls below the

reference voltage for more than 0.7...0.9 ms. No power fail signal is generated while the IC is performing its

initialization procedure.

Table 26: Power Fail Detection at FID (Master Mode and Monitor Mode)

Symbol Parameter

Min

Max

Unit

Note

VFID-PF

FID reference voltage to detect power fail

1.94.

2.06

RIN-FID

Input resistance of FID input

2 Meg

Ohms

tLoff

Power supply break down time to generate a Power

Fail Signal

0.7

0.9

1 for the measurement for the AS-I-voltage an external voltage divider is necessary, see Application Notes.

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