The recommended PCB layout for the BTS110 involves placing the device close to the battery, using a star-ground configuration, and keeping the high-current paths short and wide to minimize voltage drops and electromagnetic interference (EMI).
The sense resistor (Rs) should be chosen based on the desired current measurement range and the internal resistance of the BTS110 (Rint). A good starting point is to choose Rs = Rint / 10. The datasheet provides a formula to calculate Rs based on the desired current measurement range.
The EN (enable) pin is used to enable or disable the BTS110. When EN is high, the device is enabled, and when EN is low, the device is disabled. This pin can be used to put the device in a low-power state or to reset the device.
The BTS110 has a built-in OCP feature that limits the output current to prevent damage to the device or the battery. The OCP threshold can be adjusted using an external resistor. When an overcurrent condition is detected, the device will limit the output current to the programmed value.
The BTS110 provides a high-accuracy current measurement with a typical error of ±1.5% over the entire operating temperature range. The device also has a built-in offset correction mechanism to improve the accuracy of the current measurement.
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