ADP5065ACBZ-1-R7 datasheet(21/40 Pages) AD

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Data Sheet

ADP5065

Rev. D | Page 21 of 40

BATTERY PACK TEMPERATURE SENSING

Battery Thermistor Input

The ADP5065 charger features battery pack temperature

sensing that precludes charging when the battery pack

temperature is outside the specified range. The THR pin

provides an on and off switching current source, which should

be connected directly to the battery pack thermistor terminal.

The activation interval of the THR current source is 167 ms.

The battery pack temperature sensing can be controlled by

I2C using the conditions shown in Table 10. Note that the

I2C register default setting for EN_THR (Register 0x07) is

0 = temperature sensing off.

Table 10. THR Input Function

Conditions

THR Function

VINx

VISO_B

Open or VIN = 0 V to 4.0 V

<2.5 V

Off

Open or VIN = 0 V to 4.0 V

>2.5 V

Off, controlled by I2C

4.0 V to 5.5 V

Don't care

Always on

If the battery pack thermistor is not connected directly to the

ADP5065 THR pin, a 10 kΩ (tolerance ±20%) dummy resistor

must be connected between the THR input and GND. Leaving

the THR pin open results in a false detection of the battery

temperature being <0°C and charging is disabled.

The ADP5065 charger monitors the voltage in the THR pin and

suspends charging if the current is outside the range of less than

0°C or greater than 60°C. For temperatures greater than 0°C,

the THR_STATUS register is set accordingly, and for temperatures

lower than 60°C, the THR_STATUS register is, likewise, set

accordingly.

The ADP5065 charger is designed for use with an NTC

thermistor in the battery pack with a nominal room tempera-

ture value of either 10 kΩ at 25°C or 100 kΩ at 25°C, which is

selected by a fuse.

The ADP5065 charger is designed for use with an NTC

thermistor in the battery pack with a temperature coefficient

curve (beta). Fuse-selectable beta programming is supported by

eight steps covering a range from 3150 to 4400 (see Table 34).

JEITA Li-Ion Battery Temperature Charging Specification

The ADP5065 is compliant with the JEITA Li-Ion battery

charging temperature specifications as outlined in Table 11.

The JEITA function can be enabled via the I2C interface. When

the ADP5065 detects a JEITA cool condition, charging current

is reduced according to Table 12.

When the ADP5065 identifies a hot or cold battery condition,

the ADP5065 takes the following actions:

•

Stops charging the battery.

•

Connects/enables the battery isolation FET such that the

system power supply node is connected to the battery.

Table 11. JEITA Li-Ion Battery Charging Specification Defaults

Parameter

Symbol

Conditions

Min

Max

Unit

JEITA Cold Temperature Limits

IJEITA_COLD

No battery charging occurs.

°C

JEITA Cool Temperature Limits

IJEITA_COOL

Battery charging occurs at approximately 50% of programmed level.

See Table 12 for specific charging current reduction levels.

°C

JEITA Typical Temperature Limits

IJEITA_TYP

Normal battery charging occurs at default/programmed levels.

°C

JEITA Warm Temperature Limits

IJEITA_WARM

Battery termination voltage (VTRM) is reduced by 100 mV from

programmed value.

°C

JEITA Hot Temperature Limits

IJEITA_HOT

No battery charging occurs.

°C

Table 12. JEITA Reduced Charge Current Levels

JEITA Cool Temperature Limit—Reduced Charge Current Levels

ICHG[2:0] (Default)

ICHG JEITA (mA)

000 = 550 mA

250

001 = 650 mA

300

010 = 750 mA

350

011 = 850 mA

400

100 = 950 mA

450

101 = 1050 mA

500

110 = 1150 mA

550

111 = 1250 mA

600

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