AXP202 datasheet(22/48 Pages) ETC2

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Single Cell Li-Battery PWM Charger and Power System Management IC

AXP202

Resistance

Not charging

Low Level

Over-Voltage

4Hz Flicker

External voltage input is too high, or the battery

temperature is too high/low.

Battery Temperature Detection

AXP202 can connect a temperature-sensitive resistor via the TS pin to monitor the battery

temperature when the battery is charging or discharging. The diagram is shown below.

NTC

BAT

10uF

GND

In the diagram above, VTH/VTL refer to the high temperature threshold and low temperature threshold,

which is programmable via registers REG38H/39H/3CH/3DH respectively. VTE=0.2V. The

temperature-sensitive resistor is suggested to choose the NTC temperature-sensitive resistor, which is

10Kohm and 1% accuracy at 25℃. AXP202 will send constant current via TS pin, and the current can

be set as 20uA、40uA、60uA、and 80uA (See registerREG84H) to adapt to different NTC resistors.

When the current goes through the temperature-sensitive resistor, a test voltage is generated, which

will be measured by ADC, and compared with regulated value to release corresponding IRQ or

suspend the charge.

If the resistance value of temperature-sensitive resistor is too high or too low, extra resistors can be

serial or parallel connected to expand the detect extent.

If the battery is free from temperature-sensitive resistor, TS pin can be linked to the ground, and in that

case, AXP202 will automatically disable the battery temperature monitoring function.

Battery Detection

AXP202 Datasheet(PDF) 22 Page - List of Unclassifed Manufacturers