DocID024146 Rev 1

13/17

UM1599

Application work area

5.2

Calculated values

On the topmost section of the work area, all data, calculated from the device’s registers, are

available, such as:

•

Type0, Type1, reactive and apparent power values

•

RMS and instantaneous values of voltage and current

•

Line voltage frequency

All calculation formulas can be found in the AN2159: SPI protocol for the STPM01/STPM10

metering devices.

5.3

Status bits

There is a group-box (Status) showing the device status bits.

These bits are read-only and are automatically updated every time the device is read.

5.4

Mode signals

The mode signal group-box shows the device mode signals.

This is a read/write area: the mode signals are updated every time the device is read. To set

or clear these bits, the user should respectively check or unchecked the related check box,

then right-click and click on the “Write” button. One mode signal is written at a time.

The mode signal check boxes are automatically updated every time the device is read.

Note:

When the user selects “Write SHL” (write to shadow memory) or “Write OTP” (write

permanently to OTP memory) the software manages by itself the mode signals to perform

these operations.

5.5

Configurators

In the configurator area, divided into two tabs, all device configuration bits can be read and

written.

These bits are automatically updated every time the device is read. To set or clear a

configuration bit, the user should select the desired value from the check box or combo-box,

then use the button "Write SHL" or "Write OTP" from the command area to respectively

write temporarily or permanently all the configurators.

The TSTD bit is disabled and can be only set by the "Lock" button.

Note:

All the configuration bits are written at the same time.

5.6

Command area

The command buttons to read, write, reset and lock the device are in this area.

For details on these operations, please refer to each device datasheet.