ADP5062ACPZ-2-R7 datasheet(22/44 Pages) AD

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ADP5062

Data Sheet

Rev. B | Page 22 of 44

Figure 30. Sink Phase

Figure 31. Trickle Charge

Battery (ISO_Bx) Short Detection

A battery short occurs under a damaged battery condition or

when the battery protection circuitry is enabled.

On commencing trickle charging, the ADP5062 charger moni-

tors the battery voltage. If this battery voltage does not exceed

VBAT_SHR within the specified timeout period, tBAT_SHR, a fault is

declared and the charger is stopped by turning the battery

isolation FET off, but the system voltage is maintained at

VISO_STRK by the linear regulator.

After source phase, if the ISO_Bx or BAT_SNS level remains

below VBATH, either the battery voltage is low or the battery node

is shorted. Because the battery voltage is low, trickle charging mode

is initiated (see Figure 31). If the BAT_SNS level remains below

VBAT_SHR after tBAT_SHR has elapsed, the ADP5062 assumes that the

battery node is shorted.

The trickle charge branch is active during the battery short

scenario, and trickle charge current to the battery is main-

tained until the 60-minute trickle charge mode timer expires.

BATTERY PACK TEMPERATURE SENSING

Battery Thermistor Input

The ADP5062 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 that 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 13. Note that the

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

is 0 = temperature sensing off.

Table 13. THR Input Function

Conditions

THR Function

VINx

VISO_Bx

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 6.7 V

Don't care

Always on

If the battery pack thermistor is not connected directly to the

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 ADP5062 charger monitors the voltage in the THR pin and

suspends charging when the current is outside the range of less

than 0°C or greater than 60°C.

The ADP5062 charger is designed for use with an NTC thermistor

in the battery pack with a nominal room temperature value of

either 10 kΩ at 25°C or 100 kΩ at 25°C, which is selected by

factory programming.

The ADP5062 charger is designed for use with an NTC thermistor

in the battery pack with a temperature coefficient curve (beta).

Factory programming supports eight beta values covering a

range from 3150 to 4400 (see Table 43).

ISO_Bx

SINK PHASE

LOGIC

STATUS

OPEN

SHORT

tBAT_OK

VBATL

ISO_Bx

OPEN

LOGIC

STATUS

SOURCE PHASE

tBAT_OK

VBATH

SINK PHASE

SOURCE PHASE

TRICKLE CHARGE

ISO_Bx

LOGIC

STATUS

OPEN

SHORT

tBAT_OK

LOGIC

STATUS

SHORT

LOW

BATTERY

tBAT_OK

LOGIC

STATUS

SHORT

tBAT_SHR

VBATL

VBATH

VBAT_SHR

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