DA9072 datasheet(32/113 Pages) DIALOG

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DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

32 of 113

Equation 1:

��(��) =

��(��) × ��(��) × (

0.398

−

0.15

)

��(��) × (

0.15

− 1) − ��(��) × (

0.398

− 1)

Equation 2:

��(��) =

(

0.398

− 1)

(

��(��)

)

Where

● R(HOT) = the NTC resistance at the hot temperature

● R(COLD) = the NTC resistance at the cold temperature

The cool and warm thresholds are not independently programmable and are fixed once the cold and

hot values are determined. The cool and warm thresholds can be determined by the NTC value at

the threshold:

Equation 3:

��(��) =

��(��) × ��(��) × 0.35

��(��) − ��(��) × 0.35 − ��(��) × 0.35

Equation 4:

��(��) =

��(��) × ��(��) × 0.205

��(��) − ��(��) × 0.205 − ��(��) × 0.205

Where

● R(COOL) = the NTC resistance at the cool temperature

● R(WARM) = the NTC resistance at the warm temperature

Temp Sense Modes of Operation

The DA9072 provides two modes of battery temperature sense control: Auto mode and Host Control

mode. In Auto mode, the DA9072 enables the VTEMP voltage every 2 s or every 50 ms depending

on the VDD_PWR state. At the start of each cycle, the VTEMP voltage is activated for 10 ms after

which the TEMP_SNS voltage is checked. This timing is shown in Figure 22.

Auto mode does not rely on the host to operate; therefore, it is ideally suited to provide continuous

safety monitoring.

In battery powered operation, VTEMP is enabled for only 0.5 % of the time which reduces the typical

current required for temperature sensing to less than 1 µA.

While VDD_PWR is applied, the Temp Sense function is in Auto mode and host control of the

VTEMP period is not available. This is illustrated in the Active Power section of Figure 22.

If lower current consumption is needed, temperature sensing can be controlled by the host. In host-

controlled mode, an I2C command activates the same 10 ms VTEMP and TEMPS_SNS cycle.

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