LTC2947 datasheet(13/30 Pages) LINER

13 / 30 page

dc2334af

DEMO MANUAL DC2334A

Continuous, Shutdown and Register Auto Read are two-

state buttons; meaning, they change color if they are

enabled (highlighted, e.g. blue) or disabled (default e.g.

grey). Figure 15, right, shows this in the case of a running

continuousmeasurementandenabledRegisterAutoRead.

Shutdown will put the device into a low-power state. Any

serial transaction to the device will wake it up immediately.

Forthisreason,RegisterAutoReadwillalwaysbedisabled

before issuing the shutdown command to the device. The

GUI will report this as shown in Figure 18.

Most of the GUI controls will take effect immediately once

they are clicked or a value is entered. The only exception

is the Time Base Control. Any changed configuration and

entered value will only take effect after the Write button is

clicked. If Register Auto Read is enabled, the Time Base

Control values won’t be updated as long the user is making

changes to it. Any changed values will be discarded and

replaced by the current device values if the Write button

is not clicked. If Register Auto Read is disabled, a click on

the Read button will get the current values from the device.

By clicking on ARA within the Alert Response Protocol

section, the GUI will send the alert response address to

the I2C bus. All present slave devices that were issuing an

alert will respond with their slave address. If more than

one device is responding, the lowest slave address wins.

Figure 19 shows all responses the GUI may show after

clicking on the ARA button.

DC2334A SOFTWARE USER INTERFACE

Figure 17. Serial Interface and COM Connection Info

Figure 18. Shutdown Notice About Disabling the

Figure 19. Possible ARA Responses

configuration and slave address (for I2C only). In the

default setting the GUI will automatically try to determine

all the settings.

Once the connection is established all sub-windows are

enabled and the GUI will be ready to control the device.

The serial interface configuration will be reported in the

Status Bar of the GUI. As an example Figure 17 shows this

for I2C (upper) and SPI (lower) interface configuration.

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