The MAX6819UT-T is a high-frequency device, so it's essential to follow good layout and placement practices to minimize noise and ensure proper operation. Maxim recommends keeping the device close to the battery, using short traces, and avoiding vias under the device. A solid ground plane and a separate power plane are also recommended.
The accuracy of the battery voltage measurement depends on the accuracy of the internal voltage reference, the gain error, and the offset error. According to the datasheet, the internal voltage reference has an accuracy of ±1.5% (max), the gain error is ±0.5% (max), and the offset error is ±1mV (max). You can calculate the overall accuracy by combining these errors.
The VCC pin is the power supply pin for the MAX6819UT-T. It should be connected to a stable voltage source between 2.7V and 5.5V. The VCC pin is used to power the internal circuitry, and it's recommended to decouple it with a 1μF capacitor to reduce noise.
When the battery voltage falls below the undervoltage threshold (UVLO), the MAX6819UT-T will reset and enter a low-power state. To handle this case, you can implement a power-on reset circuit or use an external voltage supervisor to detect the UVLO condition and take appropriate action, such as shutting down the system or entering a low-power mode.
The VOUT pin is a buffered output that provides a regulated voltage to the system. The maximum current that can be drawn from the VOUT pin is 10mA, according to the datasheet. Exceeding this current limit may cause the output voltage to droop or the device to overheat.
MAX6819UT-T datasheet
by Maxim Integrated Products
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