商品簡介 |
TCA9548A具有八個雙向可以通過以下方式控制開關的翻譯I2C匯流排。 SCL / SDA上游對散開到八個下游對或通道。 任何 SCn / SDn通道或通道組合是可以選擇,由內容決定可編程控制暫存器。 這些下游通道可用於解析I2C從站地址衝突問題。 例如,如果八個相同的數字應用中需要溫度感測器,每個通道可以連接一個感測器:0-7。
系統主控器可以將TCA9548A重置為發生超時或其他不當操作斷言RESET輸入為低電壓。同樣,上電複位取消選擇所有通道並初始化 I2C / SMBus狀態。 斷言復位導致相同的重置和初始化發生無需關閉部分電源。 這樣可以恢復下游I2C匯流排之一是否應在低狀態。
開關的通過構造如下:VCC引腳可用於限制最大值,TCA9548A通過的高電壓。 限制最大高壓允許使用每對上的匯流排電壓不同,因此1.8V,2.5- V或3.3V元件可以與5V元件通信,沒有任何其他保護。 外部上拉電阻將匯流排上拉至所需的電壓水平每個頻道。所有 I/O 引腳均允許5V電壓。
商品規格 |
PIN | TYPE | Description | ||
NAME | TSSOP (PW) |
QFN (RGE) |
||
A0 | 1 | 22 | I | Address input 0. Connect directly to VCC or ground |
A1 | 2 | 23 | I | Address input 1. Connect directly to VCC or ground |
A2 | 21 | 18 | I | Address input 2. Connect directly to VCC or ground |
GND | 12 | 9 | - | Ground |
RESET | 3 | 24 | I | Active-low reset input. Connect to VCC or VDPUM (1) through a pull-up resistor, if not used |
SD0 | 4 | 1 | I/O | Serial data 0. Connect to VDPU0 (1) through a pull-up resistor |
SC0 | 5 | 2 | I/O | Serial clock 0. Connect to VDPU0 (1) through a pull-up resistor |
SD1 | 6 | 3 | I/O | Serial data 1. Connect to VDPU1 (1) through a pull-up resistor |
SC1 | 7 | 4 | I/O | Serial clock 1. Connect to VDPU1 (1) through a pull-up resistor |
SD2 | 8 | 5 | I/O | Serial data 2. Connect to VDPU2 (1) through a pull-up resistor |
SC2 | 9 | 6 | I/O | Serial clock 2. Connect to VDPU2 (1) through a pull-up resistor |
SD3 | 10 | 7 | I/O | Serial data 3. Connect to VDPU3 (1) through a pull-up resistor |
SC3 | 11 | 8 | I/O | Serial clock 3. Connect to VDPU3 (1) through a pull-up resistor |
SD4 | 13 | 10 | I/O | Serial data 4. Connect to VDPU4 (1) through a pull-up resistor |
SC4 | 14 | 11 | I/O | Serial clock 4. Connect to VDPU4 (1) through a pull-up resistor |
SD5 | 15 | 12 | I/O | Serial data 5. Connect to VDPU5 (1) through a pull-up resistor |
SC5 | 16 | 13 | I/O | Serial clock 5. Connect to VDPU5 (1) through a pull-up resistor |
SD6 | 17 | 14 | I/O | Serial data 6. Connect to VDPU6 (1) through a pull-up resistor |
SC6 | 18 | 15 | I/O | Serial clock 6. Connect to VDPU6 (1) through a pull-up resistor |
SD7 | 19 | 16 | I/O | Serial data 7. Connect to VDPU7 (1) through a pull-up resistor |
SC7 | 20 | 17 | I/O | Serial clock 7. Connect to VDPU7 (1) through a pull-up resistor |
SCL | 22 | 19 | I/O | Serial clock bus. Connect to VDPUM (1) through a pull-up resistor |
SDA | 23 | 20 | I/O | Serial data bus. Connect to VDPUM (1) through a pull-up resistor |
VCC | 24 | 21 | Power | Supply voltage |
(1) VDPUX is the pull-up reference voltage for the associated data line. VDPUM is the master I2C reference voltage and VDPU0-VDPU7 are the slave channel reference voltages.
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