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DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

31 of 113

Table 22: Battery Thermal Protection Measures

Temperature Range

Voltage at TEMP_SNS

Charger Action

Interrupt name

TBAT < TLO

VTEMP_SNS > VTEMP_LOR

Charging terminated

TS COLD

TCOLD < TBAT < TCOOL

VTEMP_LO > VTEMP_SNS >

VTEMP_COOL

Charge current = 0.5 *

ICHG setting

TS COOL

TCOOL < TBAT < TWARM

VTEMP_COOL > VTEMP_SNS >

VTEMP_WARM

Normal charging

TWARM < TBAT < THI

VTEMP_WARM > VTEMP_SNS

> VTEMP_HI

Target voltage

(VBAT_CHG) reduced by

140 mV

TS WARM

THI < TBAT

VTEMP_SNS < VTEMP_HI

Charging terminated

TS HOT

VTEMP_SNS >

VOFF_TEMP_SNS

Temp sense disabled,

Optional Fault

TS OFF

Setting the Resistor Divider

The four temperature thresholds are fixed percentages of VTEMP, see Section 2.4.2. VTEMP is

enabled in short pulses to allow the battery temperature to be monitored without drawing

unnecessary current through the resistor divider. VTEMP is derived from the VDD_SYS voltage. The

TEMP_SNS voltage is measured after a deglitch time of 10 msec, which precludes any need for

filtering at TEMP_SNS. To avoid measurement error, no filter capacitance larger than 10 nF should

be added to TEMP_SNS pin.

Temperature monitoring can be disabled by TS_EN_CHG (register 0x0026 [0]) and TS_EN_DISCHG

bits (register 0x0026 [1]), or by pulling TEMP_SNS above the VOFF_TEMP_SNS threshold (TS_OFF

state). The TS_OFF state disables temperature sensing and can optionally be flagged as a fault

condition by setting register bit TS_OFF_MODE (register 0x0026:[2]) = 0x1. When TEMP_SNS is

pulled high to enter TS_OFF state, the state is latched until TEMP_SNS is disabled.

Temp sense is disabled in Hi-Z mode. Each temp sense threshold generates an interrupt at

SYS_FLT and each has an event bit at register SYS_ISR_1 (0x0004 [7:4]) and SYS_ISR_2 (0x0005

[6]).

The battery NTC interfaces to the TEMP_SNS input through a resistive divider, see Figure 21.

TEMP_SNS

RHI

VTEMP

RLO

VBAT

NTC

Figure 21: Battery Temperature Sensing with NTC

The resistor divider values (RHI and RLO) are selected as shown below so that the cold and hot

TEMP_SNS thresholds are reached at the corresponding NTC values.

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