Texas Instruments provides a recommended layout and routing guide in the application note SLVA883, which includes guidelines for PCB layout, component placement, and routing to minimize noise and ensure reliable operation.
The TCA6408PWRG4 supports I2C bus stretching, which allows the device to slow down the I2C clock to accommodate slower devices on the bus. To configure bus stretching, set the BST bit in the Configuration Register (address 0x01) to 1. This enables bus stretching, and the device will automatically adjust the clock speed based on the slowest device on the bus.
The TCA6408PWRG4 can drive up to 400 pF of capacitive load on each I/O pin. However, it's recommended to limit the capacitive load to 200 pF or less to ensure reliable operation and minimize signal degradation.
The TCA6408PWRG4 can be reset to its default state by asserting the RESET pin low for at least 1 ms. This resets all registers to their default values and clears any pending interrupts.
The TCA6408PWRG4 has a built-in power-on reset (POR) circuit that ensures the device is properly initialized after power-up. The POR timing is typically around 1 ms, but can vary depending on the power supply ramp-up time and other factors.
TCA6408PWRG4 datasheet
by Texas Instruments
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