接口论坛 - 最近的话题

DS90UB981-Q1: DS90UB981-Q1 DSI fails to recognize the issue

Cindy Chen — Thu, 23 Jul 2026 11:33:50 GMT

DS90UB981-Q1 debugging issue:When using 1clk + 4lane at 1080P@30Hz, the device fails to recognize. The following phenomena occur: all DSI errors are 0, and MEAS_H_TOTAL0_VP0, MEAS_H_TOTAL1_VP0 are also 0. Only DPHY_STATUS can be recognized. When using 1clk + 2lane at 1080P@30Hz, there is an unstable recognition phenomenon. Sometimes it can be recognized during power-on/off, but sometimes it cannot. Only when 1clk + 1lane at 864X480@60Hz can be recognized, this is related to whether the 1 clock and 4 data streams are processed at the same length. Currently, only each differential pair is internally equal in length. Please help figure out the reason and suggest any improvements.

AM26LS32AM: AM26LS32AMFKB、AM26LS31MFKB

Niko Chao — Thu, 23 Jul 2026 11:29:22 GMT

Part Number: AM26LS32AM

缺貨，需要找尋替代產品，耐溫需相同

AM26LS32AM: AM26LS32AMFKB、AM26LS31MFKB

Niko Chao — Thu, 23 Jul 2026 11:28:02 GMT

Part Number: AM26LS32AM

缺貨，需要找尋替代產品，耐溫需相同

DS90UB981-Q1: dual channel DSI

SJ YOU — Thu, 23 Jul 2026 08:27:54 GMT

Part Number: DS90UB981-Q1

HI, TI

The DS90UB981-Q1 support dual-channel DSI (2clk+8lane) input ?

The datasheet only 4 lanes.

If support dual-channel DSI (2clk+8lanes) input, how to set the registers?
What are the recommended DSI (lanes number) settings when 3840x1080@30fps?

Thanks.

TLIN4029A-Q1: TLIN4029A-Q1可否用于48V系统

user4606857 — Thu, 23 Jul 2026 07:55:03 GMT

Part Number: TLIN4029A-Q1

Hello：

TLIN4029A-Q1可否用于48V系统呢？看手册上它的最大供电电压只有48V。

TUSB542: TX_CON_1+ 为什么要接到TXN1？

Liu Aiden — Wed, 22 Jul 2026 02:02:08 GMT

Part Number: TUSB542

手册Page 16 如下图：TX_CON_1+ 连接到TXN1，这是正确的吗？，第二张图中是demo原理图

TUSB542: TX_CON_1+ 为什么要接到TXN1？

Liu Aiden — Wed, 22 Jul 2026 01:58:43 GMT

Part Number: TUSB542

手册Page 16 如下图：TX_CON_1+ 连接到TXN1，这是正确的吗？，第二张图中是demo原理图

TPD4S480: 关于TPD4S480导通关断问题

Tian Roy — Wed, 22 Jul 2026 00:35:49 GMT

Part Number: TPD4S480

Dear TI buddy,

Could you please advise, when TPD4S480 has no VPWR, the CCx FET and FBUx FET will turn off. Is this FET turn-off bidirectional or unidirectional, and will there be any body diode reverse conduction?

Thanks，

Roy

TPD4S480: 关于TPD4S480导通关断问题

Tian Roy — Wed, 22 Jul 2026 00:31:37 GMT

Part Number: TPD4S480

Dear TI buddy,

Could you please advise, when TPD4S480 has no VPWR, the CCx FET and FBUx FET will turn off. Is this FET turn-off bidirectional or unidirectional, and will there be any body diode reverse conduction?

Thanks，

Roy

THVD2410: 防浪涌（冲击）抗扰度试验及保护电路选型问题

ED LAZY — Tue, 21 Jul 2026 02:53:40 GMT

Part Number: THVD2410

尊敬的 TI团队:

我使用的THVD2410 需要对AB口进行浪涌测试，测试内容为 600V 正负 5 次，测试时我以及搭好一个保护电路，如下图所示：

我参考了手册中对浪涌的瞬态保护，但是我不能确定的是这个在AB之间的 TVS继续使用同样的规格型号，因为我考虑的是运行条件下的任何总线端子上的输入电压的最小值和最大值为 -25V至25V，这块TVS的反向截止电压在 30V ，所以我考虑需不需要更换成 24V 的，更换后是否会对AB总线的电压有什么影响？因为我们需要大的电压来传输数据，因为总线很长以及所连接的设备比较多，目前针对于这套电路是能进行浪涌试验并保存正常的，所以我想知道并在AB端口处的那个TVS管需不需要重新选型，或者有什么好的建议，再或者可能我对手册中的“任何总线端子上的输入电压（独立或共模）(1)”这个条件没有理解到位。

感谢查阅

TPD2EUSB30: check COO and For Value-added Percentage After Local Processing

Ping Qian — Mon, 20 Jul 2026 01:06:11 GMT

Part Number: TPD2EUSB30

MPN: TPD2EUSB30DRTR COO and ACO, The place where the welding and packaging processes occur and For Value-added Percentage After Local Processing .Urgent

LP-MSPM0G3507: CCS cannot detect the board

Jiaqi Wu — Sun, 19 Jul 2026 04:25:09 GMT

Part Number: LP-MSPM0G3507
Other Parts Discussed in Thread: TMDSEMU110-U

Yesterday during development, I was using the original USB cable, but CCS couldn't connect to the board and I couldn't flash the program. The board itself is still working fine—it can control other peripherals and the old code runs without issues. But now I can't compile/flash anything and CCS won't connect. When I check Device Manager, the board doesn't show up at all. What could be causing this? Has the XDS fried? I already tried the DFU method yesterday.

SN75DP130: SN75DP130输出异常

HAISHENG HE — Sat, 18 Jul 2026 04:02:13 GMT

Part Number: SN75DP130

需要提供上面服务，我们每年采购量也比较多，我们想得到原厂的直供支持，请安排人员联系我

SN65HVD1780-Q1: RS485Design

qiuhua Chen — Fri, 17 Jul 2026 08:28:14 GMT

Part Number: SN65HVD1780-Q1

RS-485 Design

TUSB2046B: 6MHz无源晶体可以容忍的最大频偏是多大？

yin ricky — Thu, 16 Jul 2026 09:11:47 GMT

Part Number: TUSB2046B

Dear TI：

TUSB2046BIRHBR使用6MHz无源晶体，我们使用的是30ppm的晶体，但是点胶以后频偏会增大到70PPM，请帮忙确认可以容忍的最大频偏是多大？并且请给出计算公式或者依据，谢谢！

DLPC900: DLPC900 I2C Write to LED Pulse Width Has No Effect, USB Works Fine

bai bai — Thu, 16 Jul 2026 01:39:08 GMT

Part Number: DLPC900

System Info

Controller: DLPC900

Firmware:6.3.0

Interface: Linux (ARM), I2C bus 1, slave address 0x1A

Reference: DLPC900 Programmer's Guide (ZHCU950J – OCTOBER 2014 – REVISED JUNE 2024)

Problem Description

We are trying to set the Minimum LED Pulse Width (ns) via I2C, but the written value has no effect on the actual projection exposure time. The same operation works correctly via the official GUI tool over USB.

What We Have Confirmed

I2C communication is working

I2C bus scan shows device at address 0x1A responds correctly
We can successfully read registers via I2C
We can read back the value we wrote to 0x67, confirming the I2C write ACK is received

USB works correctly

The official GUI tool (USB HID) can successfully set LED Pulse Width and the projection changes accordingly
USB capture confirms the command sent is CMD2=0x1A, CMD3=0x43, with 4-byte LE payload

I2C write appears to succeed but has no effect

But by using USB to write and then I2C to read, the shortest exposure time set by USB can be read

So I would like to ask, is there a problem with the register I am writing to? I tried using i2cTransfer to write data to registers 0x62 and 0x67, but when I read the data using i2c, I found that it did not take effect. We have tried the following methods sudo i2ctransfer -y 1 w5@0x1A 0x62 0x88 0x13 0x00 0x00 sudo i2ctransfer -y 1 w5@0x1A 0x67 0x88 0x13 0x00 0x00 sudo i2ctransfer -y 1 w2@0x1A 0x62 0x88 sudo i2ctransfer -y 1 w2@0x1A 0x67 0x88 Then use sudo i2ctransfer -y 1 w1@0x1A 0x63 r16 sudo i2ctransfer -y 1 w1@0x1A 0x65 r16 After completing the USB settings, the above command is also used for reading.

SN75DP130: 不能输出DP信号

HAISHENG HE — Wed, 15 Jul 2026 06:52:22 GMT

Part Number: SN75DP130

SN75DP130这颗芯片输出不了DP信号，需要技术支持，我们公司年用量超过150万美金，希望能得到原厂的上门支持。

SN75DP130: 不能输出DP信号

HAISHENG HE — Wed, 15 Jul 2026 06:50:53 GMT

Part Number: SN75DP130

SN75DP130这颗芯片输出不了DP信号，需要技术支持，我们公司年用量超过150万美金，希望能得到原厂的上门支持。

AM26LV31E: AM26LV31E未使用的输入pin如何处理

user1359349 — Tue, 14 Jul 2026 12:02:41 GMT

Part Number: AM26LV31E

你好

请问，对于AM26LV31E 这个芯片，未用到的输入pin怎么处理，悬空，还是接地

如果是接地，可不可以先把输入接在一起，让后在统一接地，如下图，请帮忙看看，谢谢

ESD321: ESD321防静电时钳位电压对后级影响

ZXF ZXF — Mon, 13 Jul 2026 09:36:31 GMT

Part Number: ESD321

你好，我最近接触到esd防护相关的信息，现在我要给我的usb端口做esd防护，因为我的usb是直接连接到我的单片机io口，而我的单片机io口的耐压也就10v左右，但是我看ESD321器件的参数虽然在导通后钳位电压在10v以内，但是在最初的几纳秒时间电压高达50v，我很疑惑这样不会让我的io口烧坏吗，因为刚接触这一块不太懂，还有一个疑问针对于第二张图我是看到ti官方的帖子，图中我画绿色的地方，为什么是10v呢，不需要考虑最开始的尖峰电压吗？虽然我知道静电的能量很小但是如果esd管的钳位电压过高依旧会让我的后级芯片烧毁吧。希望给我一个解答，这一块我刚接触

TUSB9261: Cancel Request: Cadence Allegro design files for TUSB9261IPAPQ1

wang zehua — Mon, 13 Jul 2026 03:15:14 GMT

Hello TI team,

I’m writing to cancel my previous request for TUSB9261IPAPQ1 Cadence Allegro source files (.dsn/.brd).

We have obtained the required reference design and footprint library via other channels, so there is no need to send the design files to me anymore.

Sorry for the inconvenience caused. Thank you.

Best regards,

Mr.wang

LMH1228: LMH1228 and LMH1208 Programming Guide

dan wei — Fri, 10 Jul 2026 00:57:21 GMT

Part Number: LMH1228
Other Parts Discussed in Thread: LMH1208,

请帮忙提供一下LMH1228 and LMH1208 Programming Guide.

LMH1228: LMH1228 and LMH1208 Programming Guide

dan wei — Fri, 10 Jul 2026 00:55:18 GMT

Part Number: LMH1228
Other Parts Discussed in Thread: LMH1208,

请帮忙提供一下LMH1228 and LMH1208 Programming Guide.

TPD4E02B04: 能否用于THINE的V-BY-ONE接口的ESD保护？

? ? — Wed, 08 Jul 2026 01:24:12 GMT

Part Number: TPD4E02B04

你好，TI专家团队：

我司已将 TPD4E02B04用于HDMI2.0接口上TMDS的ESD保护，目前有THINE V-BY-ONE接口的ESD保护需求，请问 TPD4E02B04是否有用于V-BY-ONE接口ESD保护的可能？TI有眼图测试过吗？

DP83869HM: 关于DP83869的SGMII转RGMII桥接模式配置问题

? ? — Tue, 07 Jul 2026 03:04:17 GMT

Part Number: DP83869HM

我正在使用DP83869的SGMII转RGMII桥接模式，遇到了一些问题：
我使用时没有使用硬件自举功能，直接在1DF里写入0003配置成SGMII转RGMII，目前有关寄存器的值是：(1DF 0003) (0X00 1140) (0X31 0196) (0X11 在0002和0302跳动)
我需要怎么配置才能完成SGMII转RGMII功能