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LTC2946 output questions

Question asked by greydesk on Jan 17, 2018
Latest reply on Jan 18, 2018 by greydesk

I am using an LTC2946 as part of a final year Electrical and Computer Engineering project. I am communicating with the chip over I2C using an ATMega 328P. I can talk to the chip and read values from it however, the following question remain:

1. How quickly should the Timer Counter value update? Mine updates about every 4 seconds. This seems low.

2. I have a separate 5V supply running into pins 1 and 2. I am trying to sense voltage between 20 and 40V at the sense+ pin. I don't seem to get any rational value. I can provide register settings and such if needed. Can someone point me to a simple voltage measurement setup for this chip?

 

Current pin connections:

1 - VDD - 5V

2 - IntVcc - 5V

3 - GPIO1 - GND

4 - GPIO2 - GND

5 - GPIO3 - Floating - will be used as ALERT pin in final design but not yet implemented.

6 - SDA0 - SDA

7 - SDA1 - SDA

8 - SCL - SCL

9 - CLKIN - Floating

10 - CLKOUT - Floating

11 - GND - GND

12 - ADR0 - GND

13 - ADIN - GND

14 - ADR1 - GND

15 - SENSE- - Floating

16 - SENSE+ - 20V

 

Thanks!

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