ADP5065ACBZ-1-R7 datasheet(20/40 Pages) AD

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ADP5065

Data Sheet

Rev. D | Page 20 of 40

BATTERY DETECTION

Battery Level Detection

The ADP5065 charger features a battery detection mechanism to

detect an absent battery. The charger actively sinks and sources

current into the ISO_Bx/BAT_SNS node, and voltage vs. time is

detected. The sink phase is used to detect a charged battery,

whereas the source phase is used to detect a discharged battery.

The sink phase (see Figure 32) sinks ISINK current from the

ISO_Bx/ BAT_SNS pins for a time, tBATOK. If the BAT_SNS pin is

below VBATL when the tBATOK timer expires, the charger assumes no

battery is present, and starts the source phase. If the BAT_SNS

exceeds the VBATL voltage when the tBATOK timer expires, the

charger assumes the battery is present, and begins a new charge

cycle.

The source phase sources ISOURCE current to ISO_Bx or the

BAT_SNS pins for a time, tBATOK. If the BAT_SNS pin exceeds

VBATH before the tBATOK timer expires, the charger assumes that

no battery is present. If the BAT_SNS does not exceed the VBATH

voltage when the tBATOK timer expires, the charger assumes that a

battery is present, and begins a new charge cycle.

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 ADP5065 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.

The trickle charge branch is active during the battery short

scenario, and trickle charge current to the battery is maintained

until the 60 minute trickle charge mode timer expires.

After source phase, if the ISO_Bx or BAT_SNS level remains

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

can be shorted. As a result of the battery voltage being low,

trickle charging mode is initiated (see Figure 33). If the

BAT_SNS level remains below VBAT_SHR after tBAT_SHR has elapsed,

the ADP5065 assumes that the battery node is shorted.

ISO_Bx

SINK PHASE

LOGIC

STATUS

OPEN

SHORT

tBAT_OK

VBATL

ISO_Bx

OPEN

LOGIC

STATUS

SOURCE PHASE

tBAT_OK

VBATH

Figure 32. Battery Detection Sequence

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

Figure 33. Battery Short Detection Sequence

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