Interface forum - Recent Threads

TCAN4550: TCAN4550 with 3.3VIO and 5V Supply In Test Mode 1

Robert Mazzamauro — Wed, 08 Apr 2026 16:35:22 GMT

Part Number: TCAN4550

In reading the datasheet, and using the TCAN4550 in SPI and M_CAN Core Test Mode with an external transceiver, 5VDC on Vsup will not allow the device to participate in SPI and CAN commnication. Is this a correct assumption?

Thanks,

Bob M.

ESD1LIN24-Q1: Part on VW approval list

Carsten Rieger — Wed, 08 Apr 2026 16:08:14 GMT

Part Number: ESD1LIN24-Q1

Hi support team,

I recently got the info from a colleague, that your LIN ESD protection diode may not be part of the VW LIN component approval list. Is this true?

I mean it's a dedicated LIN protection for automotive, I can't believe it's not on the list.

If it's not, are you planning to get in contact with the VW network team to get it on?

Thanks for your help,

Regards,

Carsten

SN65LVDT14: SN65LVDT14 unclear layout

Mostafa Hegazi — Wed, 08 Apr 2026 12:42:35 GMT

Part Number: SN65LVDT14

I am trying to use the SN65LVDT14 for SPI over LVDS. The datasheet shows a layout of the chip in the attached image, but it does not specify the nets or values for the resistors. I want to know how to use these resistors in my design and what their values are.

DS90UB971-Q1: Request full datasheet for DS90UB971-Q1, DS90UB9722-Q1, start NDA process

Marius Pfeffer — Wed, 08 Apr 2026 12:32:51 GMT

Part Number: DS90UB971-Q1
Other Parts Discussed in Thread: DS90UB9722-Q1,

Hello,

We would like to get access to the following full datasheets; DS90UB971-Q1, DS90UB9722-Q1
And data of the
They seem to be only available with NDA, we would like to start the NDA process.

Best Regards,
Marius Pfeffer

LM61495: Design Query

Vaishnavi P — Wed, 08 Apr 2026 10:12:16 GMT

Part Number: LM61495

I am planning to use LM61495RPHR IC in one of my design.
And, i want to set delay to turn ON this IC. If i Need to set delay, i have to give previous regulator PGOOD to LM61495RPHR IC Enable Pin, that i will give. Apart from that, if any Resister divider circuit is required to add it in the enable pin of LM61495RPHR this IC., If yes, what will be the resister value, has to mount. Please suggest.
And mention waht would be the delay timing also.

TM4C129DNCPDT: not getting the desired output

Shreya DG — Wed, 08 Apr 2026 10:11:38 GMT

Part Number: TM4C129DNCPDT

#include <stdint.h>
#include <stdbool.h>

#include "inc/hw_memmap.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "driverlib/uart.h"
#include "driverlib/pin_map.h"

int main(void)
{
uint32_t sysClock;

// Set system clock to 120 MHz
sysClock = SysCtlClockFreqSet(
SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480,
120000000
);

// Enable GPIOA
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOA));

// Enable UART0
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_UART0));

// Configure PA0 (RX) and PA1 (TX) for UART0
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

// Configure UART0: 9600 baud, 8 data bits, no parity, 1 stop bit
UARTConfigSetExpClk(
UART0_BASE,
sysClock,
9600,
UART_CONFIG_WLEN_8 |
UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE
);

// Enable UART0
UARTEnable(UART0_BASE);

// Main loop
while(1)
{
UARTCharPut(UART0_BASE, 'H');
UARTCharPut(UART0_BASE, 'i');
UARTCharPut(UART0_BASE, '\r');
UARTCharPut(UART0_BASE, '\n');

SysCtlDelay(sysClock / 3); // ~1 second delay
}
}

this is the code i am using for uart communication, i am using ttl to usb converter and putty for terminal , i have used the other uart ports also the receiver part is working completely fine but transmitter part is not working so guide me to get the desired utput when i debug the code i see blank screen in putty

TUSB212: Can pin1/2,7/8 support crossing connect with USB?

Kailun Liu — Wed, 08 Apr 2026 08:58:41 GMT

Part Number: TUSB212

Hi Team,

I would like to check with you does TUSB212 support pin1 and pin8 connect to USB DP, while PIN2 and PIN7 connect to USB DM?

DS90UB925Q-Q1: How to calculate device bandwidth

JH Shin — Wed, 08 Apr 2026 03:39:08 GMT

Part Number: DS90UB925Q-Q1

Hello,

My customer wants to know the calculation method for the LVDS line bandwidth of the DS90UB925Q-Q1 for their usage

If they are using only 17 bits (data lines 0~16) + 4 bits (GPIO) and the PCLK is 80MHz, is it correct to calculate the bandwidth as follows?

* 80MHz * 21bits = 1.68Gbps

Thank you.

HD3SS3212: HD3SS3212 VBIAS

user4497266 — Wed, 08 Apr 2026 00:16:24 GMT

Part Number: HD3SS3212

Hi.

The datasheet for HD3SS3212 is a bit vague on the BIAS voltage requirements. My application uses LVDS. The LVDS is AC-coupled on both sides of the HD3SS3212, this is not something that I can change.

In the HD3SS3212's datasheet it says "VBIAS can be GND". The values for the VBIAS resistors are not mentioned.

Can you clarify that it is it ok to connect as Figure 6, with 100 kOhm resistors and using ground as VBIAS?

Regards, Jovnas

DP83869EVM: Issue with setting up 100Mbps

Fnu Premsagar — Tue, 07 Apr 2026 18:44:40 GMT

Part Number: DP83869EVM

Hi,

I have config LED[2:0] = 000 and OP_MODE[2:0] = 100 and have connected the AM62b-P1 board.

Hardware connection looks something like this -
PC>UMC-GA1F1T>DP83869EVM>AM62b-P1 board.

In this case LED0 & 1 are on, and LED2 is blinking. It works perfectly; I was able to ping the board, but when I connect the BeagleBone Industrial, only the LED2 will blink for 5-10 sec, and then it will turn off.

I thought maybe Beaglebone needed 100 Mbps, so I have set OP_MODE[2:0] = 101: LED0 was on for 3-5 sec and turned off, LED1 was off, and LED2 was blinking for 10 sec and then turned off.

It wasn't able to connect to the BeagleBone at all. Can you help me with this issue?

Thank you.

UC2901-EP: Thermal resistance from junction to the board/mount

Yoon Lee — Tue, 07 Apr 2026 16:56:42 GMT

Part Number: UC2901-EP
Other Parts Discussed in Thread: UC1901

Needing thermal resistance from junction to the board/mount, Rthjb, for component.

THVD4411: THVD4411 Shutdown Pin Function

Gabriel Melendez — Tue, 07 Apr 2026 15:41:49 GMT

Part Number: THVD4411

Hello,

I am interested in using the THVD441 in an upcoming RS-485 application. One feature that makes this device particularly appealing is the ability to fully disable it via the Shutdown (SHDN) pin.

I would like to confirm the following behavior when the SHDN pin is asserted:

All outputs are placed into a high-impedance state.
The state of the Direction (DIR) pin has no effect on the outputs while the device is shutdown.

Could you please confirm that this is the expected behavior? I want to ensure this aligns with my design requirements before selecting this component.

Thank you for your assistance!

ESD204: Design inquiry

Abhishek Manoj — Tue, 07 Apr 2026 15:15:49 GMT

Part Number: ESD204
Other Parts Discussed in Thread: TPD4E02B04,

Hi team,

I'm planning to the ESD ESD204DQAR for my USB 3.0 signals and DP interface.

For USB 3.0 interface, can i use connect the RX and TX of the USB signals in the same IC. Does it cause any issues.

Regards,

Abhishek

TXS0108E: Design Inquiry

Abhishek Manoj — Tue, 07 Apr 2026 15:13:17 GMT

Part Number: TXS0108E

Hi Team,

For the level translator TXS0108EPWR and TXS0104EPWR, for the unused channel, can it be left floating or any termination is required.

Regards,

Abhishek

TXB0102: Footprint compatibility

Shifali N — Tue, 07 Apr 2026 14:13:19 GMT

Part Number: TXB0102

Hi Team,

Please confirm whether TXB, TXS and TXU are pin to pin compatible.

Thanks,

Shifali

TXS0102: Design Inquiry

Abhishek Manoj — Tue, 07 Apr 2026 14:03:31 GMT

Part Number: TXS0102

Hi Team,

I was planning to use the 2 channel level translator TXS0102DCUR for converting my UART signals from 3.3V to 1.8V.

I have used the same level translator for UART in my other projects, it was working fine.

Does using TXS0x for UART signal will cause any issue to the signal.

Can I proceed with this level translator for my UART signals.

Regards,

Abhishek

TUSB1104: Clarification on Flip Control via MCU/host for TUSB1104 in I²C Mode with TUSB321

Nilay Patel1 — Tue, 07 Apr 2026 11:51:12 GMT

Part Number: TUSB1104
Other Parts Discussed in Thread: TUSB321, , TUSB320, , TUSB320EVM

Dear TI E2E Support Team,

I hope you are doing well.

We are currently working on a USB Type-C design using the TUSB1104RNQR in I²C mode along with the TUSB321, and would like to confirm our understanding regarding flip (orientation) control.

As per the TUSB1104 datasheet (Section 7.5 – Programming), we understand that in I²C mode the FLIP function is controlled via register writes (e.g., register 0x0A with values such as 0x11 for normal and 0x15 for flipped orientation), rather than using the FLIP pin.

From the TUSB321 side, we understand that:

The device detects cable orientation using CC1/CC2.
The orientation information is provided through the DIR pin of TUSB321.

Based on this, our current understanding is as follows:

The MCU/Host reads the DIR pin status from TUSB321 to determine cable orientation.
Based on DIR (normal/flip), the MCU/Host writes the corresponding value to the TUSB1104 over I²C (e.g., 0x0A register).
This enables proper lane mapping (normal vs flipped) inside the TUSB1104.

We would like to request your confirmation on the following points:

Is the above understanding correct for implementing flip control in I²C mode?
⁠Are there any best practices or reference designs available for this specific combination (TUSB321 + TUSB1104 in I²C mode)?

Any guidance or reference documentation would be greatly appreciated to ensure correct implementation.

Thank you for your support.

THVD1400: Bus input current

FZ — Tue, 07 Apr 2026 11:33:23 GMT

Part Number: THVD1400

Hello, I am interested in using the THVD1400 in a system with multiple modules The application is a bit specific and requires a very low bus input current when the transceiver is not used.

The datasheet specifies the maximum bus input current as 100µA when the driver is disabled.

These numbers relate to the case when the input voltage is 12V. In my use case there are several transceivers powered by 3.3V within a closed system. Therefore, the input voltage is limited to much lower levels by design.

Additionally, the low bus input current is only needed for the case when the transceiver is not used (both, driver and receiver disabled). I assume the numbers from the datasheet show the case when the receiver is enabled.

Is it possible to get the maximum bus input current for my use case when:

driver is disabled,
receiver is disabled, and
the bus input voltage is <3.3V

Thank you in advance for your assistance

TCAL9539R: Need IBIS model

Sai Chandu — Tue, 07 Apr 2026 11:17:27 GMT

Part Number: TCAL9539R
Other Parts Discussed in Thread: TCAL9539

Need IBIS Model for the above mentioned part

PCA9555: Inquiry on Supply Stability of TCA9555RGER as Replacement for PCA9555RGER

Fatjona Bilalli — Tue, 07 Apr 2026 10:01:17 GMT

Part Number: PCA9555

Hello,

We are currently using PCA9555RGER in our product; however, we are experiencing ongoing supply challenges, and it has become increasingly difficult for us to source this part through official distributors.

We understand that TCA9555RGER is a drop-in replacement for PCA9555RGER, and we are planning to evaluate it as an alternative. Before proceeding, we would like to ask if you could kindly share your input on the following:

Is TCA9555RGER expected to have a more stable supply situation compared to PCA9555RGER?
Are there any known or anticipated sourcing constraints, allocation risks, or long lead times associated with TCA9555RGER?
In general, how does TI assess the current and near-term supply outlook for this device?
Is there any plan to make it EOL in the near future?

Your guidance will help us assess the risk and make an informed decision for our product planning and continuity.

Thank you very much for your support. We look forward to your response.

THVD1426: How to use automatic-direction function

Gary Zeng — Tue, 07 Apr 2026 09:59:11 GMT

Part Number: THVD1426
Other Parts Discussed in Thread: THVD1406

Hi team,

My customer wants to use THVD1426 in DOBOT.

Now they don't have enough GPIO to control REn so they plan to use auto-direct function.

Datasheet said user needs to connect both REn and SDn to high and when D's status changes, Receive will work even REn is high.

But when D is from L to H, THVD1426 will keep Z for 8us and then receive signal from BUS.

Customer don't want to receive signals what they send by D.

How about customer send continue high high high signal by D.

TCAN1463-Q1: TCAN1463-Q1: TXD Dominant but No CAN Bus Drive (No Differential Output, nFAULT = High, Normal Mode)

Vaishak C — Tue, 07 Apr 2026 09:33:50 GMT

Part Number: TCAN1463-Q1

I am using TCAN1463-Q1 with an STM32 MCU. The device is confirmed in Normal mode and nFAULT is HIGH, but the transceiver does not drive the CAN bus when TXD is asserted dominant.

Is there any condition where the TX driver remains disabled even when EN=HIGH and nSTB=HIGH?

MCU side:
MCU: STM32C092CCT6
TXD -> PB1 (FDCAN1_TX)
RXD -> PB0 (FDCAN1_RX)
EN -> HIGH
nSTB -> HIGH (via inverter, verified)

Power:
VSUP = 5V
VIO = 3.3V

Bus:
Proper 120 ohm termination verified
Connected to a second node (CM4 + MCP2518FD + TCAN1463)

Observed Behavior:
TXD is driven LOW (dominant) by MCU
RXD remains HIGH (recessive)
CANH/CANL show no differential output (both below 1.8V on scope)
No frames observed on the bus

CAN Controller Behavior:
STM32 reports Bit0 Error on every transmission
TEC increments to Bus-Off
REC remains 0

Mode / Status:
EN = HIGH
nSTB = HIGH -> Normal mode confirmed
nFAULT = HIGH (no fault reported)

What Has Been Verified:
STB polarity (inverter present and validated)
Device enters Normal mode
nFAULT is not asserted
Bitrate and timing correct (tested also in Classic CAN 1 Mbps)
Second node confirmed working
Power rails stable

Key Observation:
Even with TXD = LOW, Normal mode active, and no faults, the transceiver does not drive dominant on CANH/CANL.

Questions:
Are there any additional internal conditions that gate the TX driver in TCAN1463?
Can the device report nFAULT = HIGH while the TX driver is internally disabled?
Does this behavior indicate a damaged TX stage?
Any recommended debug checks for TXD to bus path validation?

Additional Info:
Issue is reproducible across resets
No intermittent behavior
Scope confirms absence of dominant drive

Thanks in advance for your support.

DS90UH948-Q1: what's the min/max capacitance requirement for DS90UH948TNKDRQ1 power pins?

Pingjiang He — Tue, 07 Apr 2026 07:53:59 GMT

Part Number: DS90UH948-Q1

Hello,

DS90UH948TNKDRQ1 datasheet show the capacitors for VDD33 and VDD12, it’s the nominal value, what’s the required min. and max. value?

It needs to consider DC bias and temperature derating during WCCA.

TCAN2411-Q1: Efficiency vs. Temperature

Jay Yoo — Tue, 07 Apr 2026 07:43:34 GMT

Part Number: TCAN2411-Q1

Hi team,

Can you pls help check if there are any data or plots showing power consumption / effeciency changes with temperature for the TCAN2411-Q1 product?
For example, current consumption changes during CAN communication according to temperature.

Thanks,

Jay

TUSB8041EVM: TUSB8041 HUB design

Fhamitha M — Tue, 07 Apr 2026 06:42:18 GMT

Part Number: TUSB8041EVM
Other Parts Discussed in Thread: TUSB8041,

Hi,

We are referring to the TUSB8041 USB 3.0 hub in our design and have reviewed the TUSB8041EVM for reference.We noticed that an EEPROM is used in the EVM design. Could you please confirm whether the EEPROM is mandatory for operation, or if the hub can function without it?Additionally, the EEPROM part used in the EVM (AT24C04A-10PI-1.8) appears to be obsolete. Could you kindly suggest a suitable alternate component?

Regards,

Fhamitha M