TI中文支持网Part Number:BQ76952
Hi ，
Cell 1 Voltage Validation During SLEEP Mode
In rare cases, an invalidCell 1 Voltage() reading has been observed to occur in some devices taken during
SLEEP mode.
While the device is in SLEEP mode, each result obtained from reading theCell 1 Voltage() must be validated
before it can be considered valid. During SLEEP mode, current is below programmable thresholds, so the pack
is typically not being charged or discharged with any significant level of current. Thus, the cell voltages will
generally not be changing significantly.
In order to determine if a measurement ofCell 1 Voltage() taken during SLEEP mode is valid, it is necessary to
compare each measurement to measurements taken before and after the particular measurement. It is important
that these three readings represent threeseparate measurements for theCell 1 Voltage(). If the reading is
significantly different from the separate readings taken before and after, then that reading is considered invalid
and should be discarded.
In order to ensure the three measurements read from the device are trulyseparate measurements, the host
can read the measurements at intervals exceedingPower:Sleep:Voltage Time while the device is in SLEEP
mode. This is necessary to avoid the host reading an existing measurement multiple times, before a new
measurement has been taken and is available for readout.
An invalidCell 1 Voltage() reading may result in an SUV PF Alert being set but does not result in an SUV PF
status fault if the SUV Delay is set to 1 second or longer. It also does not trigger a Cell Undervoltage (CUV)
Protection alert or status fault, since this protection uses a comparator for its detection. If a reading reported by
Cell 1 Voltage()is below theProtections:CUV:Thresholdlevel and the CUV protection is enabled, but the CUV
Alert is not triggered, this also can be used as an indication the reading is invalid.
This validation process is necessary to ensure that validCell 1 Voltage() results are measured.
Star Xu：
您好 ，在sleep mode，电压不会有太大变化，如果变化太大数值会丢弃。如果启动保护，一般都是警报，没有启动保护。
