SA2005P datasheet(6/16 Pages) SAMES

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Figure 6: Multiplexing of the LED Drivers

DIR1

DIR2

VFAIL2

VFAIL1

DIR3

VFAIL3

R10

R11

PH/DIR

PH1

PH2

PH3

DIR 1

DIR 2

DIR 3

DIR (Drive)

PH (Sink)

VFAIL 1

VFAIL 2

VFAIL 3

Channel 1

Channel 2

Channel 3

dr-01603

The PH/Dir output is used in conjunction with the LED driver

outputs to display information about each individual phase, see

figure 6.

Phase LED Drivers (PH1, PH2, PH3)

The LED driver outputs present either direction information or

voltage information. The three LED driver outputs are used in

conjunction with the PH/DIR output to display information

about each individual phase (refer to figure 6) as follows:

PH/DIR = 1 (Direction indication)

When PH/DIR is high (logic 1) energy direction information for

each individual phase is available on PH1, PH2 and PH3. A

logic 0 indicates reverse energy flow and a logic 1 indicates

positive energy flow. Reverse energy flow is defined as the

condition where the voltage sense input and the current sense

inputs are out of phase (greater than 90 degrees). Positive

energy flow is defined as the condition where the voltage

sense and current sense inputs are in phase.

PH/DIR = 0 (Voltage fail / phase sequence error)

When PH/DIR is low (logic 0) voltage information is available

on PH1, PH2 and PH3. A logic 0 on any of these pins indicates

a voltage failure, the SA2005P does not detect a zero crossing

on the applicable voltage sense input. Referring to figure 6 the

voltage fail LED will be on when the voltage phase is present

and off when the voltage phase is missing.

In the case of a phase sequence error all three LED driver

outputs PH1, PH2 and PH3 will pulse with a repetition rate of

approximately 1Hz.

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