TCA9849
- 1-to-4 Bidirectional translating multiplexer 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 TCA9849 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 (A114A)
- ±500V Charged-device model (C101)
The TCA9849 device is an 4-channel, bidirectional translating multiplexer that can be controlled through 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. These downstream channels can be used to resolve I2C target address conflicts. For example, if four identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-3.
The system controller can reset the TCA9849 in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.
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 TCA9849. 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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| 應用說明 | Multiplexer/Switch Solutions for Fast Mode Plus I2C Applications | PDF | HTML | 2026/1/14 |
設計與開發
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