TCA9846
- 1-to-4 bidirectional translating switches with ultra low voltage translation down to 0.65V
- I2C bus and SMBus compatible
- Active-low reset input
- 2 address pins, allowing up to 16 TCA9846 devices on the I2C bus
- Channel selection through an I2C Bus, in any combination
- Power up with all switch channels deselected
- Low RON switches
- Allows voltage-level translation between 0.65V, 0.8, 1.2V, 1.8V, 2.5V, and 3.3V
- No glitch on power up
- Supports hot insertion
- Low standby current
- Operating power-supply VDD2 voltage range of 1.65V to 3.6V
- Operating power-supply voltage VDD1 range of 0.65V to 3.6V
- 3.6V tolerant inputs
- 0 to 1MHz clock frequency
- Latch-up performance exceeds 100mA per JESD 78, class II
- ESD protection exceeds JESD 22
- ±2000V human-body model (A114-A)
- ±500V charged-device model (C101)
The TCA9846 is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active-low reset (RESET) input allows the TCA9846 to recover from a situation in which one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed so that VDD1/VDD2 pins can be used to limit the maximum high voltage, which is passed by the TCA9846. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 0.65V, 0.8V, 1.2V, or 1.8V parts can communicate with 3.3V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6V tolerant.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | TCA9846 Ultra Low-Voltage 4-Channel 1MHz Capable I2 C Switch 数据表 (Rev. B) | PDF | HTML | 2026-9-8 | ||
| 应用手册 | 适用于快速模式 + I2C 应用的多路复用器和开关 | PDF | HTML | PDF | HTML | 2026-3-16 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
TCA984649-EVM — TCA984649 评估模块
TCA984649-EVM 用于评估 TCA9846 和 TCA9849 的性能。该评估模块 (EVM) 未随附焊接的单元。可以在产品页面底部在线订购样片。该 EVM 可让工程师评估 TCA9846 和 TCA9849 I2C 信号功能。该 EVM 具有一个 USB2ANY 公连接器，可通过 DUT 发送 I2C 信号。USB2ANY 微控制器必须单独购买，此 EVM 未随附。如果使用 USB2ANY 进行通信，则必须以凹口朝上的方式连接电缆。每个引脚的测试点都有多个接地点，以便于使用。负载电容器封装和上拉电阻器等其他功能可用于简化评估和测试。
TMUX-24PW-EVM — 适用于 16 引脚、20 引脚和 24 引脚 PW 薄型紧缩小外形封装 (TSSOP) 的 TMUX 通用评估模块
TMUX-24PW-EVM 评估模块支持对 TI TMUX 产品系列进行快速原型设计和直流表征，该产品系列采用 16、20 或 24 引脚 TSSOP 封装 (PW)，并适用于在高电压下运行。
TMUXBQB-DYYEVM — 采用 16 引脚 BQB、DYY 和 PW 封装的通用 TMUX 评估模块
TMUXBQB-DYYEVM 支持对采用 16 引脚 TSSOP (PW)、WQFN (BQB) 和 SOT-23 THIN (DYY) 封装的 TMUX 产品系列进行快速原型设计和直流表征。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |
订购和质量
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