Product Info

Smart Module Series
SC600Y&SC600T Hardware Design
SC600Y&SC600T_Hardware_Design 45 / 134
SC600Y/SC600T supports battery temperature detection in the condition that the battery integrates a
thermistor (47KΩ 1% NTC thermistor with B-constant of 4050KΩ by default; SDNT1608X473F4050FTF of
SUNLORD is recommended) and the thermistor is connected to BAT_THERM pin. If BAT_THERM pin is
not connected, there will be malfunctions such as boot error, battery charging failure, battery level display
error, etc.
A reference design for battery charging circuit is shown below.
Figure 11: Reference Design for Battery Charging Circuit
SC600Y/SC600T offers a fuel gauge algorithm which is able to accurately estimate the battery’s state by
current and voltage monitor techniques. Using precise measurements of battery voltage, current, and
temperature, the fuel gauge provides a dependable state of charge estimate throughout the entire life of
the battery and across a broad range of operating conditions. It effectively protects the battery from
over-discharging, and also allows users to estimate the battery life based on the battery level so as to
timely save important data before completely power-down.
Mobile devices such as mobile phone and handheld POS systems are powered by batteries. When
different batteries are utilized, the charging and discharging curve has to be modified correspondingly so
as to achieve the best effect.
If thermistor is not available in the battery, or adapter is utilized for powering the module, then there is only
a need for VBAT and GND connection. In this case, the system may be unable to detect the battery,
which will cause power-on failure. In order to avoid this, BAT_THERM should be connected to GND with a
47KΩ resistor. BAT_PLUS and BAT_MINUS must be connected, otherwise there may be abnormalities in
use of the module. Among them, BAT_PLUS and BAT_MINUS are used for battery level detection, and
they should be routed as differential pair to ensure accuracy.