EVAL-AD5755-1SDZ Просмотр технического описания (PDF) - Analog Devices

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EVAL-AD5755-1SDZ

Evaluation Board User Guide

Analog Devices 

UG-244

WRITING TO THE DC-TO-DC CONTROL REGISTER

This function allows you to write to and configure the dc-to-dc

control register. Select the required clamp voltage, switching

frequency, and phase from the pull-down menu and click WRITE

to write the selected data to the device. On the evaluation board,

the dc-to-dc converter perform best at a 410 kHz switching

frequency (see the DC-to-DC Boost section). See the appro-

priate data sheet for information on the DC-DC Comp bit. If

selecting an external compensation resistor, this can be placed

at R12, R13, R14, and R15.

WRITING TO THE MAIN CONTROL REGISTER

This function allows you to write to and configure the main

control register. After configuring the settings you require, click

WRITE to write to the device.

Evaluation Board User Guide

WRITING TO THE SLEW RATE CONTROL REGISTER

The slew rate control register can be accessed from the tab at

the bottom of the evaluation software window (see Figure 15).

The slew rate control functions (Slew Rate Clock and Slew

Rate Step) allow you to configure the slew rate on a per-

channel basis. After configuring the setting you require, click

WRITE to write to the device.

Table 10. Slew Rate Register Functions

Option

Description

SE

Enable/disable the slew rate control feature.

Slew Rate Clock Set the slew clock rate.

Slew Rate Step Set the step size when slewing.

Figure 13. Write to the DC-to-DC Control Register in the Evaluation Software

Figure 14. Write to the Main Control Register in the Evaluation Software

Table 11. Main Control Register Functions

Option

Description

POC

Determines the state of the VOUT channel when the voltage output channel is disabled during normal operation.

Disabled: disabled VOUT channels goes to the function set by the POC pin.

Enabled: disabled VOUT channels goes to the opposite function of the POC pin.

STATREAD

Enable/disable status readback during a write (see the Status Readback section for details about using this

feature).

EWD

Enable/disable the watchdog timer (see the Writing to the Main Control Register section for details about using

this feature).

Watchdog Timeout

Select timeout period for watchdog timer (using 100 ms or 200 ms with the evaluation software recommended).

ShtCctLim

Selects short-circuit current limit on the VOUT channels.

OUTEN ALL

Enables the output on all four DACs simultaneously.

Do not use OUTEN ALL when enabling channels via the DAC control registers.

DC-DC ALL

When set, powers up the dc-to-dc converter on all four channels simultaneously.

To power down the dc-to-dc converters, all channels outputs must first be disabled.

Do not use the DC-DC ALL option when enabling the dc-to-dc converters via the DAC control registers.

Figure 15. Write to the Slew Rate Control Register and Other Functions in the Evaluation Software

Rev. B | Page 8 of 16

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