电平转换I²C总线/SMBus中继器
设计文件
收到完整的详细信息。 请参阅产品足迹及更多信息 电子CAD文件.
Eight-Channel Ultra-Low Voltage, Fm+ I²C-Bus Switch with Reset
The PCA9848 is an ultra-low voltage, octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any or all SCx/SDx channels can be selected, determined by the programmable control register. This feature allows multiple devices with the same I²C-bus address to reside on the same bus. The switch device can also separate a heavily loaded I²C-bus into separate bus segments, eliminating the need for a bus buffer.
An active LOW reset input allows the PCA9848 to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and deselects all the channels, as does the internal Power-On Reset (POR) function.
The pass gates of the switches are constructed such that the VDD1 pin is used to limit the maximum high voltage which is passed by the PCA9848. This allows the use of different bus voltages on each channel, so that 0.8 V, 1.8 V, 2.5 V or 3.3 V parts can communicate without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6 V tolerant.
产品详情
Features
Octal I²C Bidirectional Switch
- Multiple target devices can be selected or one at a time
- Enables multiple devices with same I²C bus address on same bus
- Isolates heavily loaded I²C into separate bus segments
- Reset by pin or I²C command
- Two address pins allow up to 16 devices on I²C bus
- Clock frequency range from 0 Hz to 1 MHz
Integrated Translation
- 1:8 bidirectional voltage translation
- VDD1 (host) range from 1.08 V to 3.6 V
- VDD2 (target) range from 1.65 V to 3.6 V
Robustness Feature Set
- Supports hot insertion due to all channels de-selected at power-on
- Low RON enables lower conduction losses, reducing heat generation
- Tolerant inputs up to 3.6 V
- No glitch on power up
- 6 kV HBM ESD protection per JESD22-A114
- 1 kV CDM protection per JESD22-C101
- Exceeds 100 mA latch-up per JESD78
Package Offering
- HVQFN24 rated up to +125 C
- TSSOP24 rated up to +85 C
购买/参数
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