ULC1001-Q1: Questions about ULC1001-Q1

Hi Chase, 

The full data sheet can be requested here: https://www.ti.com/product/ULC1001-Q1

1. Could you recommend any piezo parts which performance is verified with ULC1001-Q1? (any vendor, any part number including Murata and TDK and so on)

ULC1001-Q1 is a DSP controller with PWM output and can drive the piezo as long as with the proper driver. The piezo parts for ULC are highly customized. You can talk to piezo vendors and ask them. We don't have the public info that can be revealed from Murata or TDK. 

2. What is the maximum and minimum size of piezo parts?

For ULC automotive applications, typically the inner diameter of piezo parts is 10-40mm.  

3. What is the difference between DRV2901 and DRV2911-Q1? Cause DRV2911-Q1 is automotive qualified and have better shutdown parameter but it is cheaper.

We highly recommend DRV2911Q1 to pair with ULC1001Q1 considering its footprint is much smaller than DRV2901. Automotive camera board has very limited size and a compact IC solution is very critical. 

3-1. Do you have any plan to release automotive version of DRV2901? No, we don't. 

3-2. What is the meaning of Vs(max)(V) = 3.6, 40 in DRV2911-Q1 parameters? Why does it have 2 parameters? It is a typo. The max should be 40. 

3-3. the difference between ULC1001-DRV290XEVM and ULC1001-DRV2911EVM is only the difference of piezoelectric transducer driver? Rest of EVM are same?

Yes, the key difference is the driver. The surrounding circuits are also different slightly. They cannot simply swap the driver. We recommend  ULC1001-DRV2911EVM for evaluation. 

4. I can see optional LC filter parts in the datasheet of DRV2911-Q1, figure 7.2.

the values of these LC filters are fixed values which depends on the piezo parts? or Can I change it for better performance? 

If I can change, Can I get more information about it? (Equation, or other information)

Also i want to know the values about pullups and pulldowns to ISNS_x and VSNS_x.(R1~R6)

Yes, the LC filter values depends on piezo parts. Please request the full data sheet for the related info. 

5. Could you check essential Vin for the system? My customer saw 35V and also 12V in old datasheet. Not sure which Vin it is about. We don't have a 35V vin for ULC1001 or DRV2911 in any data sheet. 

6. What is the maximum output power(W) from DRV2911-Q1 or DRV2901? It can support up to 8A. The MAX PVDD is 50V for DRV2901  and 40V for DRV2911, meaning the outpower can be over 200W.    

7. What is the data format of output of DRV2911-Q1 or DRV2901? (PWM, sine wave, or etc) The output is square wave. After the LC filter, it is close to a sine wave. 

8. My customer wants to use 3 ultracleaning systems in one MCU. Is it possible to control separately through I2C? ULC is a single channel DSP. To drive 3 ULC systems, basically 3 ULC1001Q1 and 3 drivers are needed. 

9. About calculation tool, Should my customer calibrate every single modules for better performance? or Can I use only one set of parameters for every modules? One set of parameters for all modules is possible. 

10. Do you have any standards about thickness and hardness of piezo parts? We don't have the standards. Piezo vendors should have a better answer about their piezo properties. 

Please check these issues. Thanks.

Hi Chase, 

The patents are to protect TI's rights to play in the field. TI does not charge anything as long as the customer uses TI ULC solution.