MAX31328 datasheet(4/11 Pages) MAXIM

4 / 11 page

MAX31328 Shield

Evaluates: MAX31328

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Detailed Description of Software

Real Time Monitoring

To monitor the time and date, on Configuration & Time page, under RTC Configuration group box, enable Oscillator

Enable toggle button, and under Real Time Monitoring group box, check Auto Update checkbox for continuous reading.

Battery current draw in Time-Keeping Mode

To measure the battery current draw under normal real-time clock conditions, without any interrupt or CLKO output:

Remove the jumper from JU9.

Connect the negative terminal of the pico ammeter to the pin 3 of the JU9 (marked as a white dot) and the positive

terminal to pin 1 of JU9.

On the Configuration & Time tab, in the RTC Configuration group box, make sure interrupt pin INT is selected. In

the Real Time Monitoring group box, uncheck the Auto Update check box. In the Temperature Monitoring group

box, uncheck the Auto Update check box. In the Flags group box, click Disable 32kHz to disable the output 32kHz.

Remove the jumper from JU4, to disconnect the IC from VCC and connect to battery supplied mode.

The reading in the pico ammeter is the battery current consumed by the MAX31328 IC only. It should be around

660nA.

32kHz Output Frequency

On the Configuration & Time tab of the software, under the Flags group box, click the Enable 32kHz button. The

clock output can be monitored using an oscilloscope connected to 32kHz test point (TP8). A frequency counter can also

be used to measure the clock frequency accurately.

Alarm and Timer Configuration

Use the Alarm 1 Configuration and Alarm 2 Configuration to configure Alarm 1 and Alarm 2 (See Figure 2).

MAX31328 Datasheet(PDF) 4 Page - Maxim Integrated Products