The BM83 module has a 10-bit Successive Approximation
Register (SAR) ADC with ENOB (Effective Number of Bits) of 8-bits; used for battery
voltage detection, adapter voltage detection, charger thermal protection, and ambient
temperature detection. The input power of the SAR ADC is supplied by the 1.8V output of
Buck2. The warning level can be programmed by using the Config Tool or the SDK.
The SK1 and SK2 are the ADC channel pins. The SK1 is used for charger
thermal protection. The following figure illustrates the suggested circuit and
thermistor, Murata NCP15WF104F. The charger thermal protection can avoid battery charge
in a restricted temperature range. The upper and lower limits for temperature values can
be configured by using the Config Tool. Figure 5-3. Ambient Detection
Circuit
Note: The thermistor must be placed close to
the battery in the user application for accurate temperature measurements and to enable
the thermal shutdown feature.
The following figures show SK1 and SK2 channel behavior.
Figure 5-4. SK1 Channel
Figure 5-5. SK2 Channel
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