WEBVTT

00:00:00.000 --> 00:00:00.500 align:middle line:90%


00:00:00.500 --> 00:00:03.970 align:middle line:84%
本影片將重點介紹
何謂 I2C 設計工具

00:00:03.970 --> 00:00:07.350 align:middle line:84%
以及它如何協助使用者
設計 I2C 匯流排

00:00:07.350 --> 00:00:10.530 align:middle line:84%
針對剛開始接觸
設計 I2C 匯流排的使用者

00:00:10.530 --> 00:00:12.840 align:middle line:84%
本工具提供許多
系統檢查功能

00:00:12.840 --> 00:00:16.350 align:middle line:84%
可協助避免潛在問題
並節省時間

00:00:16.350 --> 00:00:18.960 align:middle line:84%
針對較有經驗的
I2C 使用者而言

00:00:18.960 --> 00:00:21.240 align:middle line:90%
本工具仍十分實用

00:00:21.240 --> 00:00:24.480 align:middle line:84%
可在 PCB 匯流排中
協助提供容量與評估

00:00:24.480 --> 00:00:26.910 align:middle line:84%
並快速進行上拉
電阻器計算

00:00:26.910 --> 00:00:29.730 align:middle line:84%
I2C 設計工具
是一款線上工具

00:00:29.730 --> 00:00:33.390 align:middle line:84%
專為協助使用者解決
潛在 I2C 挑戰而打造

00:00:33.390 --> 00:00:37.950 align:middle line:84%
這些挑戰包括位址衝突
VCC 衝突、匯流排電容限制

00:00:37.950 --> 00:00:42.390 align:middle line:90%
零件選擇、上拉電阻器計算

00:00:42.390 --> 00:00:46.260 align:middle line:90%
速度衝突、相對於 VCC 的緩衝器放置

00:00:46.260 --> 00:00:50.460 align:middle line:84%
以及有關靜態電壓偏差
的緩衝器放置

00:00:50.460 --> 00:00:53.790 align:middle line:84%
第一個設計挑戰
是要確保 I2C 匯流排

00:00:53.790 --> 00:00:57.750 align:middle line:84%
不會遭遇位址衝突
因為 I2C 標準規定

00:00:57.750 --> 00:01:00.420 align:middle line:90%
從屬位址必須是唯一的

00:01:00.420 --> 00:01:03.960 align:middle line:84%
以防止重新異動期間
資料損毀

00:01:03.960 --> 00:01:07.650 align:middle line:84%
I2C 設計工具會尋找
任何位址衝突

00:01:07.650 --> 00:01:10.830 align:middle line:84%
並在使用 I2C 交換器或 Mox
產生位址衝突時

00:01:10.830 --> 00:01:14.930 align:middle line:90%
提供解決方法

00:01:14.930 --> 00:01:18.660 align:middle line:90%
VCC 衝突可能導致

00:01:18.660 --> 00:01:21.630 align:middle line:84%
無法承受更高
偏壓電壓的裝置損壞

00:01:21.630 --> 00:01:24.390 align:middle line:84%
I2C 設計工具
將提供解決方案

00:01:24.390 --> 00:01:27.270 align:middle line:90%
以使用 I2C 位準移位器

00:01:27.270 --> 00:01:30.810 align:middle line:90%
或具有位準轉換的 I2C 開關

00:01:30.810 --> 00:01:33.229 align:middle line:90%
來解決

00:01:33.229 --> 00:01:35.030 align:middle line:90%
匯流排電容

00:01:35.030 --> 00:01:38.960 align:middle line:90%
是較大負載 I2C 匯流排的常見問題

00:01:38.960 --> 00:01:40.910 align:middle line:90%
因為 I2C 規範規定

00:01:40.910 --> 00:01:44.360 align:middle line:90%
標準模式和快速模式的匯流排電容

00:01:44.360 --> 00:01:45.350 align:middle line:90%
必須小於 400 皮法拉以下

00:01:45.350 --> 00:01:48.020 align:middle line:90%
I2C 設計工具

00:01:48.020 --> 00:01:51.710 align:middle line:84%
擁有以 PCP 寄生為基礎的
內建電容估計功能

00:01:51.710 --> 00:01:54.979 align:middle line:84%
電容值超過
400 皮法拉限制時

00:01:54.979 --> 00:01:58.220 align:middle line:84%
該工具將對 I2C 緩衝器
區段、電容等提出建議

00:01:58.220 --> 00:02:00.725 align:middle line:90%
以符合 I2C 標準

00:02:00.725 --> 00:02:05.990 align:middle line:90%


00:02:05.990 --> 00:02:09.620 align:middle line:90%
E2E 論壇上最常見的問題之一

00:02:09.620 --> 00:02:13.760 align:middle line:84%
是特定 I2C 匯流排
要使用哪個上拉電阻器？

00:02:13.760 --> 00:02:16.310 align:middle line:90%
I2C 設計工具

00:02:16.310 --> 00:02:18.110 align:middle line:84%
根據預估的匯流排電容
和最大 I2C 頻率

00:02:18.110 --> 00:02:21.320 align:middle line:90%
為 I2C 匯流排的每個區段

00:02:21.320 --> 00:02:25.640 align:middle line:90%
提供最大和最小上拉電阻值

00:02:25.640 --> 00:02:31.730 align:middle line:90%


00:02:31.730 --> 00:02:34.329 align:middle line:90%
為避免訊號完整性問題

00:02:34.329 --> 00:02:36.710 align:middle line:90%
以不同速度運轉的 I2C 從屬裝置

00:02:36.710 --> 00:02:39.770 align:middle line:84%
不應共存於
相同 I2C 匯流排上

00:02:39.770 --> 00:02:42.079 align:middle line:90%
I2C 設計工具

00:02:42.079 --> 00:02:44.180 align:middle line:90%
將考量到這一點

00:02:44.180 --> 00:02:47.000 align:middle line:84%
並使用具有停用功能的
I2C 開關或 I2C 中繼器

00:02:47.000 --> 00:02:51.320 align:middle line:84%
來分離最大運轉速度
不同的從屬裝置。

00:02:51.320 --> 00:03:02.250 align:middle line:90%


00:03:02.250 --> 00:03:05.190 align:middle line:90%
當存在 I2C 潛在衝突時

00:03:05.190 --> 00:03:08.160 align:middle line:84%
I2C 設計工具
將提供潛在解決方案

00:03:08.160 --> 00:03:10.830 align:middle line:90%
供使用者選擇以解決問題

00:03:10.830 --> 00:03:21.470 align:middle line:90%


00:03:21.470 --> 00:03:23.930 align:middle line:90%
有些 I2C 緩衝器

00:03:23.930 --> 00:03:26.930 align:middle line:84%
對如何與其他緩衝器連接
有嚴格的規定

00:03:26.930 --> 00:03:30.500 align:middle line:84%
I2C 設計工具將確保
任何靜態電壓偏差緩衝器

00:03:30.500 --> 00:03:33.500 align:middle line:90%
在其靜態電壓偏差端

00:03:33.500 --> 00:03:35.300 align:middle line:90%
都不會相互連接

00:03:35.300 --> 00:03:44.230 align:middle line:90%


00:03:44.230 --> 00:03:48.400 align:middle line:84%
I2C 設計工具
目前確實有一些限制

00:03:48.400 --> 00:03:50.590 align:middle line:90%
它並不支援多個主要裝置

00:03:50.590 --> 00:03:53.620 align:middle line:84%
從屬裝置不包括
介面代表產品以外的裝置

00:03:53.620 --> 00:03:57.100 align:middle line:90%
例如溫度感測器馬達驅動器、加速計等

00:03:57.100 --> 00:03:59.470 align:middle line:90%


00:03:59.470 --> 00:04:01.870 align:middle line:84%
此工具也不支援
任何電路板外的通訊檢查

00:04:01.870 --> 00:04:03.460 align:middle line:90%
通訊.

00:04:03.460 --> 00:04:05.860 align:middle line:90%
最後，本工具也沒有考量

00:04:05.860 --> 00:04:08.470 align:middle line:90%
電源供應排序

00:04:08.470 --> 00:04:11.140 align:middle line:90%
I2C 設計工具

00:04:11.140 --> 00:04:13.360 align:middle line:90%
可快速產生匯流排設計

00:04:13.360 --> 00:04:14.950 align:middle line:90%
並自動解決常見問題

00:04:14.950 --> 00:04:18.279 align:middle line:84%
內建匯流排電容估算值
和上拉電阻值檢查器

00:04:18.279 --> 00:04:20.890 align:middle line:90%
使本工具成為

00:04:20.890 --> 00:04:23.350 align:middle line:90%
經驗豐富的 I2C 設計人員

00:04:23.350 --> 00:04:25.580 align:middle line:90%
和通訊協定新手的實用工具

00:04:25.580 --> 00:04:29.440 align:middle line:84%
因此，請至 ti.com
試用我們免費的 I2C 設計工具

00:04:29.440 --> 00:04:32.670 align:middle line:90%
to help simplify your I2C tree.