Activity for newbie
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #296357 | Initial revision | — | 2 months ago |
| Question | — |
Measuring the peak voltage of a 1 kHz PWM/square wave using ESP32 ADC without peak detector I need to measure the positive peak of a 1 kHz PWM/square wave using an ESP32 ADC. The waveform has variable duty cycle; the minimum positive pulse width is about 100 µs. After scaling, the ADC input positive levels are approximately 2.2 V, 1.65 V, 0.68 V, and 0.30 V. I only need to classif... (more) |
— | 2 months ago |
| Comment | Post #296303 |
My firmware engineer told me that he is able to toggle GIPIO via a sync register. (more) |
— | 3 months ago |
| Comment | Post #296294 |
Hii.. Olin, My firmware engineer told me that he is able to toggle GIPIO via a sync register. (more) |
— | 3 months ago |
| Comment | Post #296294 |
AD5941 has 3 GPIO's. AD5940 has 8 GPIO's. The datasheet is same for both the IC's. For my board I used AD5941 with 3 GPIO's. (more) |
— | 3 months ago |
| Edit | Post #296293 | Initial revision | — | 3 months ago |
| Question | — |
AD5941 GPIO2 cannot act as general-purpose output — any workaround without a board respin? I'm using the AD5941 (CPZ-RL7) and driving 3 external mux address lines from its GPIO0, GPIO1, and GPIO2 pins. This IC has only 3 GPIO's. Firmware engineer reported that GPIO2 cannot act as general-purpose output. I also did not check the datasheet in detail while doing the schematic. Now board f... (more) |
— | 3 months ago |
| Comment | Post #296050 |
Thank you. For IC's also I can see IPC-A, IPC-B, IPC-C and Manufacturer part numbers. May I know which one you will suggest for IC's (more) |
— | 5 months ago |
| Edit | Post #296042 | Initial revision | — | 5 months ago |
| Question | — |
Altium IPC Footprint Options: Which One Should I Choose for Best DFA and Assembly Yield? When downloading a Manufacturer Part Number (MPN) directly from Altium Manufacturer Part Search, I often see multiple footprint options available for the same component: IPCA IPCB IPCC MFG (manufacturer-recommended footprint) Imagealttext I understand that IPCA/B/C correspond to... (more) |
— | 5 months ago |
| Edit | Post #296036 |
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— | 5 months ago |
| Edit | Post #296036 | Initial revision | — | 5 months ago |
| Question | — |
Guarding high-impedance AD8244 input traces from a fine-pitch connector — how much is really needed? I have 4 very high-impedance analog signals coming from a fine-pitch 100-pin connector to AD8244 buffer inputs. An electrochemical biosensor IC will be mouted on this connector. Its reference electrode pin is connected to buffer. The buffer output is connectes to AD5941. The board stack-up is: ... (more) |
— | 5 months ago |
| Edit | Post #296030 | Initial revision | — | 5 months ago |
| Question | — |
Using one shared reset signal across two rigid boards connected by flex PCB — good practice or risky? I am working on a rigid-flex design with two ICs placed on different rigid sections: an MCU on one board an AD5941 on another board The two rigid sections are connected by a flex PCB. This is a 4 layer board. This is the stack-up. Imagealttext I am considering using one shared system ... (more) |
— | 5 months ago |
| Edit | Post #295752 | Initial revision | — | 6 months ago |
| Question | — |
Need Clarification on Op‑Amp Selection and Direct ADC Input Drive Requirements In my circuit, I am using an OPA333 op‑amp to buffer a sensor signal before it goes through a two‑stage RC low‑pass filter (R13–C44 and R14–C45). My simulation shows the overall filter bandwidth is around 45 kHz. The microcontroller I’m using is a Microchip SAM‑D5x/E5x device, which has a... (more) |
— | 6 months ago |
| Comment | Post #295552 |
I talked to vendor. What they told is that I can edit the stack-up. Create a 4 layer stack-up for flex pcb. The thickness must be less than 0.24mm. (more) |
— | 7 months ago |
| Comment | Post #295552 |
Yes I am in touch with him, will update you once I receive the update. (more) |
— | 7 months ago |
| Edit | Post #295552 | Initial revision | — | 7 months ago |
| Question | — |
Altium pure flex pcb design I’m designing a 100% flexible PCB (no rigid FR-4 regions in the construction). The board is a wearable strap and we want a 4-layer flex stack. My PCB supplier (Würth “SLIM.flex 4F”) sent me an Altium stackup file (.stackup). When I open it in Altium Layer Stack Manager, it shows two regions: ... (more) |
— | 7 months ago |
| Edit | Post #295516 |
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— | 7 months ago |
| Edit | Post #295516 | Initial revision | — | 7 months ago |
| Question | — |
Integrator saturating I am trying to simulate a leaky integrator in LTspice using an AD8603 op‑amp. My long‑term goal is to model slow‑changing outputs from MOX gas sensors, but the gas sensor itself is not important for this problem — the issue happens even with a simple test signal. To design the integrator, I fo... (more) |
— | 7 months ago |
| Comment | Post #295446 |
Thanks again for the detailed explanation — it really helped clarify things. I now understand that both the diode idea and the transistor circuit solve the same issue of keeping the MCU TX from ever driving the DCDI line HIGH. Since the TLE4973 uses a low‑value pull‑up, your transistor solution s... (more) |
— | 7 months ago |
| Edit | Post #295444 | Initial revision | — | 7 months ago |
| Question | — |
Single wire UART to Microcontroller I’m using an Infineon TLE4973 current sensor. It has a DCDI pin, which the datasheet describes as a single‑wire, open‑drain, UART‑based interface (master–slave). It specifies logic thresholds (LOW ≤ 1.0 V, HIGH ≥ 1.6 V) and recommends a pull‑up resistor between 433 Ω and 1320 Ω on the DCDI line. ... (more) |
— | 7 months ago |
| Edit | Post #295414 |
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— | 7 months ago |
| Comment | Post #295414 |
Updated the question (more) |
— | 7 months ago |
| Edit | Post #295414 |
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— | 7 months ago |
| Edit | Post #295414 | Initial revision | — | 7 months ago |
| Question | — |
ENOB vs Resolution I'm trying to clarify my understanding of the relationship between ADC resolution and ENOB (Effective Number of Bits), particularly when it comes to practical calculations. From what I understand, ENOB represents the actual performance of an ADC accounting for real-world imperfections like noise... (more) |
— | 7 months ago |
| Comment | Post #295313 |
Thans of the detailed answer. Can I follow 3W rule for the spacing between SWD and SWCLK. (more) |
— | 8 months ago |
| Comment | Post #295302 |
Thank you for your time and concern. I will take care of it next time. (more) |
— | 8 months ago |
| Comment | Post #295302 |
Thanks, I’ve updated the question to include the relevant schematic excerpt and quotes from the documentation (more) |
— | 8 months ago |
| Edit | Post #295302 |
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— | 8 months ago |
| Edit | Post #295302 |
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— | 8 months ago |
| Edit | Post #295302 |
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— | 8 months ago |
| Edit | Post #295302 | Initial revision | — | 8 months ago |
| Question | — |
Need clarification on SWDIO/SWCLK length‑matching and “shielding” for STM32WBA5MMG debug connector I am using the STM32WBA5MMG module in my design. The reference design is the MB2131 STM32WBA5M M.2 expansion board from ST (schematic), and the external debug connector sheet contains the note: > Specific constraints for SWDIO and SWCLK (must have same length and must be shielded). p.5 in ... (more) |
— | 8 months ago |
| Comment | Post #295265 |
I never see pull-up on all SPI lines. Some boards I have seen pull-up in CS lines. SPI is push-pull so I am confused why we need pull up resistors on SPI lines. I thought of asking experts. That is why I posted here. (more) |
— | 8 months ago |
| Comment | Post #295265 |
Maximum 15cm. Speed I need to check with firmware team. (more) |
— | 8 months ago |
| Edit | Post #295265 |
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— | 8 months ago |
| Edit | Post #295265 | Initial revision | — | 8 months ago |
| Question | — |
Do we need to use pull up resistors in SPI lines when the ADC and Microcontroller are far apart I have an ADC board. This board will communicate with a STM32 develoment board via SPI interface. I am using jumper cables for connecting the ADC SPI lines to ST32 evaluation board. Below is my ADC schematic. I gave the ADC schematic for review to the concerned analog devices team. The respons... (more) |
— | 8 months ago |
| Comment | Post #295259 |
Thanks for the detailed response. I think there may be a misunderstanding of my intent.
I am not trying to encode 13 output states using a single digital line. The address lines are already shared and are used only to select channels within each MUX.
My requirement is simply mutual exclusion be... (more) |
— | 8 months ago |
| Edit | Post #295252 | Initial revision | — | 8 months ago |
| Question | — |
Mutually exclusive enable for TMUX1108 (8:1) and TMUX1104 (4:1) using SN74LVC1G240 — safe POR and logic review I have two analog multiplexers on the same net (WORKELEC): TMUX1108 (8:1) TMUX1104 (4:1) For 4:1 MUX Enabled is going through an Inverter . They must be mutually exclusive (never enabled at the same time). Additionally, I want both MUXes disabled at power‑on (POR). Control Signal... (more) |
— | 8 months ago |
| Comment | Post #295191 |
Another issue is do you really need 16 bits? --> Frankly speaking I don't know that, I am tasked to do the hardware. I am designing assuming 16 bit is needed, will check with the sensor team and update here.
What are you trying to measure? -->Biopotential This is a sweat sensor.
What are o... (more) |
— | 9 months ago |
| Comment | Post #295191 |
"I did not say to filter the output directly from the buck/boost converter, only to the A/D" . I am making a board for real testing. I did not understand those words. You mean the filtered output should only be provided to AVDD? (more) |
— | 9 months ago |