DA9155M datasheet(22/38 Pages) RENESAS

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DA9155M

2.5 A Companion Charger for Rapid Charging

Datasheet

Revision 3.2

25-Feb-2022

CFR0011-120-00 Rev 5

22 of 37

VBUS, in which case the undervoltage lockout is too low to detect a weak supply. By default, VIN_DROP

is set to the same voltage as the VIN_UVLO, which effectively disables the VIN_DROP.

The status of the VIN monitoring comparators can be read out from the status registers (S_VIN_UV,

S_VIN_OV, S_VIN_DROP).

10.6 VBAT Monitoring

The VBAT monitoring is illustrated in Figure 18. The slave charger has to monitor the battery voltage in

case of fault conditions during charging, meaning that battery over- and undervoltage have to be

detected.

DA9155M features two factory programmable settings for handling the monitoring:

1. An overvoltage or undervoltage event triggers an event (E_VBAT_OV, E_VBAT_UV) and the

BUCK_EN register is de-asserted. Resuming normal operation requires that VBAT is within normal

range and the events are cleared. The supervision of the battery voltage VBAT is done by

comparators.

2. An overvoltage or undervoltage event does not disable the Buck converter. Only the status

registers are updated (default).

The VBAT monitoring status comparators can always be read out from the status registers

(S_VBAT_UV, S_VBAT_OV).

10.7 Junction Temperature Supervision

To protect DA9155M from damage due to excessive power dissipation the junction temperature is

monitored continuously. The monitoring is split into three temperature ranges TJUNC_WARN (125 °C),

TJUNC_CRIT (140 °C), and TJUNC_POR (150 °C).

If the junction temperature rises above the first threshold (TJUNC_WARN), the event

E_TJUNC_WARN is asserted. If the event is not masked, this will fire an interrupt. This first level of

temperature supervision is intended for non-invasive temperature control, where the necessary

measures for cooling the system down are left to the host software. The status of the TJUNC_WARN

comparator can be read from S_TJUNC_WARN. The interrupt is only generated when the

temperature crosses the threshold from low to high. After the interrupt, the application processor can

read out the comparator status to detect when the temperature drops below the threshold.

If the junction temperature continues to rise and crosses the second threshold (TJUNC_CRIT), an event

is fired (E_TJUNC_CRIT), the BUCK_EN is de-asserted, and DA9155M moves to the disabled

mode. Resuming normal operation requires that TJUNC drops below TJUNC_CRIT and the event is

cleared.

There is also a third temperature threshold (TJUNC_POR) which causes DA9155M to enter the reset

mode. DA9155M stays in the reset mode as long as the junction temperature is above TJUNC_CRIT.

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