BD71805MWV Datasheet, PDF (17/100 Pages) Rohm – System PMIC for Battery Powered Systems

BD71805MWV
(1) Slave Control Mode States
(a) Shutdown Mode
When VSYS falls below 2.9V, BD71805MWV enters Shutdown mode. A thermal shutdown event also forces
BD71805MWV into Shutdown mode. To reset the hung up system, assert RESETINB to LOW causing the IC to shut
down. Only VSYS voltage measurement block (UVLO) is powered in this mode. All registers are cleared to initial data.
To exit Shutdown mode, VSYS must exceed 3.2V.
(b) OFF Mode
BD71805MWV enters OFF mode after a turn-off event. In this mode, SNVS, UVLO, RTC and Battery measurement
(Coulomb Counter) blocks are powered. POR is asserted LOW in this mode. To exit OFF mode, a valid turn-on event is
required.
(c) ON Mode
BD71805MWV enters ON mode after a turn-on event. POR is deasserted HIGH in this mode of operation.
(d) STANDBY Mode
BD71805MWV enters STANDBY mode when STANDBY pin is asserted. This mode is typically used for low-power
mode of operation. When in STANDBY mode, power consumption is reduced by lowering regulators’ output voltages,
or disabling some regulators, etc. Such configuration is pre-programmed through the I2C interface. To exit STANDBY
mode, STANDBY pin is de-asserted.
(e) SLEEP Mode
BD71805MWV enters SLEEP mode when PWRON pin is de-asserted and any BUCKxOMODE bit is set to HIGH. In
SLEEP mode, each regulator will use the settings programmed to its sleep mode registers, e.g., BUCKxOMODE for
BUCKx. Activated regulators will maintain the settings for this mode until the next turn-on event.
When in SLEEP mode, power consumption is reduced by lowering regulators’ output voltages, shifting regulators to
PFM fixed mode, or disabling some regulators, etc. Such configuration is pre-programmed through the I2C interface.
To exit SLEEP mode, PWRON pin is asserted.
(2) Slave Control Mode Events
(a) Turn On Events
From OFF mode, BD71805MWV is powered on by turn on events. BD71805MWV Slave mode has two turn on events.
See Power Stage Transitions diagram (Figure 10). Following are more detailed descriptions of turn on events.
•If PWRON signal is HIGH, BD71805MWV will turn on.
•If DCINOK signal is High (DCIN is supplied with appropriate voltage), BD71805MWV will turn on.
(b) Turn Off Events
From ON, STANDBY or SLEEP mode, BD71805MWV is powered off by turn off events. BD71805MWV has two turn
off events. See Power Stage Transitions diagram (Figure 10). Following are more detailed descriptions of turn on
events.
•If PWRON signal is LOW when all BUCKxOMODE bits are set to LOW, BD71805MWV will turn off.
•If VSYS falls below 3.1V, BD71805MWV will turn off.
(c) Thermal Shutdown event (Thermal protection)
If the die temperature surpasses a given threshold, the thermal protection circuit will shut down BD71805MWV to
avoid damage. A turn-on event will not power on the PMIC while it is in thermal protection. The part will remain in
Shutdown mode until the die temperature decreases below a given threshold. There are no specific interrupts related
to this other than the warning interrupt. See Power Dissipation section for more detailed information.
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TSZ02201-0Q4Q0AB00050-1-2
27.Feb.2015 Rev.001