AMC1304M05: About AMC1304M05 AND analog switch

WAYNEWU

Prodigy 170 points

Part Number: AMC1304M05
Other Parts Discussed in Thread: MPC507

after AC current senser ，before ACM1304， How do I add a 8 channel 8:2 analog switch circuit?

over 6 years ago

0 WAYNEWU over 6 years ago

Prodigy 170 points

The circuit, right?

0 Tom Hendrick over 6 years ago in reply to WAYNEWU

TI__Guru**** 168445 points

Hi Wayne,

C27 would have to refer to GND_USH1. Other than that, I don't see anything wrong with the circuit. How often do you intend to switch the MUX and what are you using to decode the AMC1304 output?

0 WAYNEWU over 6 years ago in reply to Tom Hendrick

Prodigy 170 points

Switch to one LIVE LINE per second, using STM32F101C8T6

0 WAYNEWU over 6 years ago in reply to WAYNEWU

Prodigy 170 points

Is it possible to add an 1M resistor to the analog switch at both ends of the sampling resistor?

0 Tom Hendrick over 6 years ago in reply to WAYNEWU

TI__Guru**** 168445 points

Hi Wayne,

Yes, you can add resistors.

0 WAYNEWU over 6 years ago

Prodigy 170 points

Part Number: AMC1304M05

Tool/software: Code Composer Studio

How does the AMC1304 AND MPC507AU GND connect? Does this diagram see this? Can GND_USH AND GND_USH1 be linked together?

0 WAYNEWU over 6 years ago in reply to Tom Hendrick

Prodigy 170 points

How does the AMC1304 AND MPC507AU GND connect? Does this diagram see this? Can GND_USH AND GND_USH1 be linked together?

0 WAYNEWU over 6 years ago in reply to WAYNEWU

Prodigy 170 points

0 Tom Hendrick over 6 years ago in reply to WAYNEWU

TI__Guru**** 168445 points

Hi Wayne,

As best I can tell from your schematic, the power rail connecting to the AMC1304 is +5V_USH, which is referenced to GND_USH on the output side of T1. The GND_USH1 net appears to be connected only to the AGND pin of the AMC1304, the nearby caps, U7 and FB4. You would need to tie that ground back to GND_USH somewhere to ensure you had the proper power supplied to the modulator.

0 WAYNEWU over 6 years ago in reply to Tom Hendrick

Prodigy 170 points

HI Tom Hendrick

Front end input AC LIVE and GND_USH1 are connected, can not be connected? If the connection to the live is only a single-phase be controlled , the three-phase connection cannot be controlled at the same time

0 Tom Hendrick over 6 years ago in reply to WAYNEWU

TI__Guru**** 168445 points

I'm sorry Wayne, but I don't understand the question, or maybe I am missing something.

You are creating a +5V_USH through T1, which powers the AMC1304 and the MPC507 - however, the return for that +5V_USH is GND_USH while the returns for the AMC and MPC are GND_USH1. If the grounds are not connected to the power source, what will the real supply voltage be?

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AMC1304M05: About AMC1304M05 AND analog switch