LM3560TLXSLASHNOPB datasheet(21/48 Pages) TI1

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tBLANK

(15.24s)

tPERIOD

(1.016s)

tACTIVE

(3.048s)

tPERIOD

tBLANK

(5.08s)

(1.016s)

IIND

tBLANK

tPULSE

tPERIOD

tPULSE

tPERIOD

LM3560

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SNOSB43B – SEPTEMBER 2011 – REVISED AUGUST 2013

Figure 32. Message Indicator Timing Diagram

MESSAGE INDICATOR EXAMPLE 1 (Single Pulse with Dead Time):

As an example, to set up the message indicator for a 312 ms ramp-up and ramp-down, 192 ms pulse width, and

1 pulse followed by a 5s delay. The indicator settings will be as follows. tR = tF = 312 ms, tWIDTH = 192 ms (tPERIOD

= 312 ms x 2 + 192 ms x 2 = 1016 ms). BLANK# setting will be: 5s/1016 ms x 1 (PERIOD# = 1). Giving a

BLANK# setting of 5. The resulting waveform will appear as:

Figure 33. Message Indicator Example 1

MESSAGE INDICATOR EXAMPLE 2 (Multiple Pulses with Dead Time):

Another example has the same tR, tF, tPULSE, and tBLANK times as before, but this time the PERIOD# is set to 3.

Now the tACTIVE time is tPERIOD × 3 = 1016 ms × 3 = 3048 ms. This results in a blank time of tBLANK = tACTIVE ×

BLANK# = 3.048s × 5 = 15.24s

Figure 34. Message Indicator Example 2

UPDATING THE MESSAGE INDICATOR

The best way to update the message indicator is to disable the Message Indicator output via the Enable Register

bit [6], then write the new sequence to the Indicator Register and/or Indicator Blinking Register, and then re-

enable the Message Indicator. Updating the Indicator Registers while it is active can lead to long delays between

pattern changes. This is especially true if the PERIOD#, or BLANK# setting is changed from a high setting to a

lower setting.

NTC MODE

Writing a (1) to Configuration Register 1 bit [4] configures the LEDI/NTC pin for NTC mode. In this mode the

indicator current source is disabled, and LEDI/NTC becomes the positive input to the an internal comparator.

NTC mode operates as a LED current interrupt that is triggered when the voltage at LEDI/NTC goes below 1V.

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