AXP223 datasheet(23/56 Pages) ETC2

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AXP223

PMIC Optimized For Multi-Core High-Performance System

AXP223 Datasheet Revision 1.1

PAGE

9.3.7.

Battery Temperature Detection

AXP223 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 :

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℃. AXP223 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, AXP223 will automatically disable the battery temperature monitoring function

9.3.8 Battery Detection

AXP223 will automatically detect the battery presence, record the result in registers (refer to REG01H)

and release IRQ13, IRQ14.

The battery detection can be enabled and disabled by Host. (Refer to register REG32H.)

AXP223 Datasheet(PDF) 23 Page - List of Unclassifed Manufacturers