Question 1) I am confused by the description given on page 21 of the BQ34Z110 data sheet (Dec 2012) regarding the X10 MODE.
X10 MODE
The bq34z110 supports high current and high capacity batteries above 32.76 Amperes and 32.76 Ampere-Hours
by switching to a times-ten mode where currents and capacities are internally handled correctly, but various
reported units and configuration quantities are rescaled to tens of milliamps and tens of milliamp-hours. The need
for this is due to the standardization of a two byte data command having a maximum representation of ±32767.
When the X10 bit (Bit 7) is set in the Pack Configuration register, all of the mAh, cWh, and mWh settings will take
on a value of ten times normal. When this bit is set, the actual units for all capacity and energy parameters will
be 10 mAh or Wh. This includes reporting of Remaining Capacity. This bit will also be used to rescale the current
reporting to 10 times normal, up to ±327 A. The actual resolution then becomes 10 mA.
It is important to know that setting the X10 flag does not actually change anything in the operation of the gauge.
It serves as a notice to the host that the various reported values should be reinterpreted ten times higher. X10
Current measurement is achieved by calibrating the current gain to a value X10 lower than actually applied.
Because the flag has no actual effect, it can be used to represent other scaling values. See Design Energy
Scale.
If it is "various reported units and configuration quantities" please state specifically which are affected.
If it is "all" then please confirm that "all" the following data flash parameters are afffected.
BQ34Z110 mA and mAh parameters
Taper Current (mA)
Min Taper Capacity (0.01mAh)
Rem Cap Alarm (mAh)
Initial Standby (mA)
Initial Max Load (mA)
CC Threshold (mAh)
Design Capacity (mAh)
Design Energy (mAh) -- scaled by Design Energy Scale parameter
SOH Load Current (mA)
SOC1 Set Threshold (mAh)
SOC1 Clear Threshold (mAh)
SOCF Set Threshold (mAh)
SOCF Clear Threshold (mAh)
Max Lifetime Chg Current (mA)
Max Lifetime Dsg Current (mA)
Sleep Current (mA)
User Rate (mA)
User Rate (mW) -- scaled by Design Energy Scale parameter
Reserve Cap (mAh)
Reserve Energy (mWh) -- scaled by Design Energy Scale parameter
Qmax Max Delta % (mAh)
Dsg Current Threshold (mA)
Chg Current Threshold (mA)
Quit Current (mA)
Qmax Cell 0 (mAh)
Avg I Last Run (mA)
Avg P Last Run (mW) -- scaled by Design Energy Scale parameter
Deadband (mA)
Question 2) Also please expand on the function of the "T Rise" parameter also scaled by the Design Energy Scale setting (See Table 10, p17)
Thanks,