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O9039A385IZWSRQ1 Automotive Power Management Unit (PMU) for Processor TI
Texas Instruments TI
O9039A385IZWSRQ1 Datasheet PDF : 109 Pages
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TPS659038-Q1, TPS659039-Q1
SWCS095K – AUGUST 2013 – REVISED JANUARY 2018
Use Equation 2 to calculate the temperature compensated result.
IL
IFS u GPADC code
ª¬212 1º¼ u ª¬1 TC _ R0 u Temperature 25 º¼
IOS
(2)
For values of IFS0 and IOS0, see Section 5.12.
The SMPS thermal monitoring is enabled (default) and disabled with the SMPS_THERMAL_EN register.
When enabled, the SMPS thermal status is available in the SMPS_THERMAL_STATUS register. SMPS12
and SMPS3 have shared thermal protection, in effect, if SMSP12 triggers the thermal protection, then
SMPS3 operating in stand-alone mode is disabled. There is no dedicated thermal protection in SMPS8 or
SMPS9.
Each SMPS has a detection for load current above ILIM, indicating overcurrent or shorted SMPS output. A
register SMPS_SHORT_STATUS indicates any SMPS short condition. Depending on the interrupt short
line mask bit register (INT2_MASK.SHORT), an interrupt is generated upon any shorted SMPS. If a short
situation occurs on any enabled SMPSs, the corresponding short status bit is set in the
SMPS_SHORT_STATUS register. A switch-off signal is then sent to the corresponding SMPS, and the
SMPS remains off until the corresponding bit in the SMPS_SHORT_STATUS register is cleared. The
SMPS_SHORT_STATUS register is cleared when read, or by issuing a POR. The same behavior applies
to LDO shorts using the SDO_SHORT_STATUS registers. The time between a short detection and a
SMPS switch-off is approximately 155 µs to 185 µs.
6.3.2.1.4 POWERGOOD
The external POWERGOOD terminal indicates if the outputs of the SMPS are correct or not (Figure 6-4).
Either voltage and current monitoring or a current monitoring only can be selected for POWERGOOD
indication. This selection is common for all SMPSs in the SMPS_POWERGOOD_MASK2
.POWERGOOD_TYPE_SELECT bit register. When both voltage and current are monitored,
POWERGOOD signal active (polarity is programmable) indicates that all SMPS outputs are within certain
percentage, VSMPSPG, of the programmed value and that load current is below ILIM.
All POWERGOOD sources can be masked in the SMPS_POWERGOOD_MASK1 and
SMPS_POWERGOOD_MASK2 registers. When an SMPS is disabled, it should be masked to prevent it
forcing POWERGOOD inactive. When SMPS voltage is transitioning from one target voltage to another
due to DVS command, voltage monitoring is internally masked and POWERGOOD is not impacted.
It is also possible to include in POWERGOOD the GPADC result for SMPS output current monitoring by
setting SMPS_COMPMODE = 1. Only one SMPS can be monitored by the GPADC channel at the time.
The POWERGOOD function can also be used for monitoring an external SMPS is at the correct output
level and the load is lower than the current limit; indication is through the GPIO_7 terminal.
All POWERGOOD sources can be masked in SMPS_POWERGOOD_MASK1 and
SMPS_POWERGOOD_MASK2 registers.
Copyright © 2013–2018, Texas Instruments Incorporated
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