Vicor PI33XX-XX Multi-Phase Design Guide Manual de usuario descargar pdf (Pagina 3)

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Multi-Phase Design Guide

Programming Synchronization Delay

The PI33XX-2X provides an I

Standard Mode

digital interface that enables the user to

program phase delays. This is a one-time

programmable option to the device. To set a

delay, the user needs to assign a unique Device

Address (see Table 2) to wake up the device

during programming. Then send the

synchronization delay address (21h) and the

delay data (OEh) while adhering to I

C protocols

and Figure 4 sequencing.

The following figure demonstrates the proper

steps to program a single phase-delay. The

device address is determined by the user and

the synchronization delay is provided in Table 1.

The device address is represented as XXh (Bold)

in Figure 6. Because this process in not

reversible, it is important to follow all steps in

Figure 4.

1) Clear all Registers to 00h with the device enabled

Start

Addr.

Device

Ack

Addr.

Reg

Ack

Data

Ack

Stop

XXh

20h

00h

XXh

21h

00h

XXh

22h

00h

2) Enter Test Mode 5

Start

Adr.

Device

Ack

Adr.

Reg

Ack

Data

Ack

Stop

XXh

18h

05h

3) Disable then Re-enable the Device (Enable Pin)

4) Set Desired Delay

Start

Adr.

Device

Ack

Adr.

Reg

Ack

Data

Delay

Ack

Stop

XXh

21h

0Eh

5) Disable Device (Enable Pin)

6) Return to Test Mode 0

Start

Adr.

Device

Ack

Adr.

Reg

Ack

Data

Ack

Stop

XXh

18h

00h

7) Repeat 1); Clearing all Registers

8) Enable Device (Enable Pin); Programming is Complete

Figure 4 - Showing the 8 Steps Required to Program a Single 1/3 Phase Delay

1 2 3 4

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