PCA9420BS datasheet(22/85 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

8.13.2 Battery temperature sensing and JEITA-compliant charging profile

aaa-049003

45°C

60°C

10°C

Programmed VBAT_REG

0°C

No operation

during cold fault

Programmed ICHG

(100%)

50%

Cold fault

0.2

VHOT VWARM

0.4

0.6

0.8

1.0

VCOOL

1.2

1.4

VCOLD

1.6

Termination

disable

1.8

TS voltage-V

Hot

fault

charge

disable

Figure 11. Operation over TS bias voltage for JEITA

Please refer to Section 8.6 for more details

8.13.3 Battery attach detection

The device has a unique battery detection scheme with two comparators, 1.9 V and 3.4 V. When the detection

scheme is executed, a 5 mA current sink is activated to determine battery presence by detecting the fall

threshold, VBAT_DET_LOW, 1.9 V typ. In addition, a 5 mA current source is used to detect battery voltage whether

it stays above the threshold, VBAT_DET_UP, 3.4 V. If both conditions are met, absence of battery is declared.

Battery detection sequence steps:

1. VBAT Sources 5 mA current to the PMIC Battery Detection Circuit.

2. If VBAT voltage is above 1.9 V, the battery is present. Stop the detect sequence, assert the “present” output.

3. Else if VBAT voltage is below 1.9 V, source 5 mA from PMIC into VBAT pin.

4. If VBAT voltage is below 3.4 V, the battery is present. Stop the detect sequence, assert the “present” output.

5. Else if VBAT voltage is above 3.4 V, the battery is absent (open). The charger stays disabled.

NOTE: The battery detect source and sink are separate dedicated circuits; 5 mA is a constant, not

programmable. The reset source is recorded on the "Reset monitor" register (address 0x71h)

For more details, see Figure 10.

8.13.4 Low-battery/dead-battery (pre-qualification) charging

If the battery is detected and VBAT < VBAT_LOW, the charger initiates pre-charging using a predefined (I2C

PCA9420

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Product data sheet

Rev. 4.2 — 26 July 2023

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