NPM1100-CAAA-R7 datasheet(22/58 Pages) NORDIC

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Core components

• Using a battery pack with an integrated NTC thermistor

• Connecting a thermistor between the

NTC pin and the AVSS pin

The thermistor needs to have thermal contact with the battery and preferably within the battery pack.

Recommended values for the NTC thermistor are found in the following table.

Parameter

Value

Unit

Nominal resistance at 25°C

kΩ

Resistance accuracy

B25/50 constant

3380

Kelvin

B25/85 constant

3434 to 3435

Kelvin

B constant accuracy

Table 12: Recommended NTC thermistor values

If the thermal protection feature is not used, then a 10 kΩ, ≤20% accuracy resistor should be connected

between

NTC and AVSS pins.

To provide JEITA compliant thermal protection, the charge current limit and termination voltage are

adjusted according to the NTC thermistor measurement.

Temperature region

Battery temperature Charging current

Termination voltage

Cold

T < 0°C

0 (OFF)

Cool

0°C < T < 10°C

IREDUCED

VTERM

Nominal

10°C < T < 45°C

ICHGLIM

VTERM

Warm

45°C < T < 60°C

ICHGLIM

VTERM-VTHIGH_DELTA

Hot

T > 60°C

0 (OFF)

Table 13: Battery temperature ranges

6.2.7 Charger thermal regulation

If the device junction temperature exceeds THIGH and CHARGER is in Fast Charge mode, the charge current

is reduced to IREDUCED.

6.2.8 Charger error conditions

A CHARGER error condition occurs when one of the following are present:

• A battery short (

VBAT to AVSS)

• Battery voltage lower than VBATCHARGEMIN after battery detection due to a fault with the battery

• Trickle charge timeout; see TOUTTRICKLE

• Constant voltage charge/fast charge timeout; see TOUTCHARGE

• Device internal error occurs when CHARGER is self-checking

After an error is detected, CHARGER is disabled, the charging error indication is activated, and the charging

indication is deactivated. Error conditions are cleared when

VBUS is disconnected and reconnected again.

Note: The constant voltage/fast charge timeout is the combined time spent in both constant

voltage charge and fast charge, TOUTCHARGE.

4445_367 v1.0

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