DA9155M datasheet(16/36 Pages) DIALOG

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DA9155M

2.5 A Companion Charger for rapid charging

9.1

Main charger

The main charger is a fully featured charger that can operate as a stand-alone device. It is also

designed to support an external slave charger. The main charger is responsible for the following

functions:

● Charging control (pre-charge, CC, CV, JEITA)

● Battery detection

● Battery activation

● Battery pre-charge

● CV-phase

● IBUS sensing (IBUSM + IBUSS)

● Reverse-current protection

● IBATM regulation

● IBAT sensing (IBATM + IBATS)

● Battery isolation

● TBAT monitoring

● VBAT sensing

9.2

Slave charger

The slave charger provides a regulated current (IBATS) and it is enabled only in the CC-phase of

charging. The slave charger does not feature a VBAT regulation loop, and therefore, does not

operate during CV-phase of charging. It is controlled by the application processor. The slave charger

is responsible for the following functions:

● IBATS regulation

● Hazard detection (VBAT over- and undervoltage)

For more details about the slave charger operation and the system integration, please refer to the

application note.

10 Functional description

10.1 Control signals

10.1.1

The EN pin controls the BUCK_EN register. A rising edge sets the register and a falling edge clears

it. The rising edge of the EN pin has to occur when DA9155M is in the disabled mode. The

application processor can start the Buck by asserting the EN pin or by setting the BUCK_EN bit

through the 2-wire interface.

The level of the EN pin can be read from S_EN_PIN register.

A fault condition in the system (VIN_DROP, VIN_OV, VIN_UV, VBAT_OV, VBAT_UV, VIO_UV,

TJUNC_CRIT) de-asserts BUCK_EN and triggers a transition to the disabled mode. If a rising edge

of the EN pin occurs while the fault condition remains, the Buck is not enabled and an event

indicating a blocked enable is triggered (E_EN_BLOCK). Re-enabling the Buck after a fault condition

requires that status and event bits are cleared.

The EN pin can be shorted to ground when not used.

Datasheet

v3.05

22-July-2016

CFR0011-120-00 Rev 5

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