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DA9021/22

System PMIC with high efficiency USB power manager

Datasheet

Revision 2.5

17-Feb-2017

CFR0011-120-00 Rev 5

116 of 142

20.3.3

A2: TBAT and battery temperature warning nIRQ measurement mode

When the battery is being charged, the TBAT voltage is measured automatically. During this

measurement, a 50 µA current is sourced to the battery temperature sense resistor from the TBAT

pin. The TBAT high and low thresholds are programmed into the OTP. The measurement result is

used to protect the battery pack from damage during charging at too high temperatures. Temperature

is flagged by three threshold levels held in the threshold registers (loaded from OTP at start-up). If

three consecutive readings of TBAT are outside the configured range, then charging is disabled, an

event flag is set and an interrupt is generated. The processor can then either service the IRQ and

turn off charging or do nothing. If nothing is done, the FAST CHARGE block will start charging again

as soon as the temperature readings are inside the programmed range. The generation of this IRQ

can be masked.

20.3.4

A4, A5: automatic measurement and high/low threshold warning nIRQ mode

The automatic measurement result of channel ADC_IN4 is stored. If a reading of ADC_IN4 is outside

the programmed range then an event flag is set. If nIRQ was asserted the automatic measurement of

channel ADC_IN4 is paused until the host has cleared the associated event flag (the event causing

value is kept inside the result register). If debouncing is selected the event will only be asserted if two

consecutive measurements override the same threshold. The assertion of nIRQ can be masked by

IRQ mask.

The same functionality is available at ADC_IN5 .In addition it is possible to use ADCIN4 with a 15

μA

current source that allows automatic measurement of a resistor value. During automatic

measurements the enabled current source is dynamically switched off at the end of the conversion

and switched on one slot prior to the next ADC_IN4 measurement (to enable minimum current

consumption, and allow external capacitance to settle), otherwise its status is static.

20.3.5

A8: automatic measurement of internal temperature

Selection of channel 8 (TJUNC) will be used to measure the output of the internal temperature sensor

generated out of a PTAT current from the BGR. The channel 8 measures the output of the

temperature sensor with a gain of 3. An offset register can be used for a one point calibration of the

temperature sensor.

20.3.6

A3, A9: manual measurement VBAT and VBBAT

Channel 3 will be used to manually measure the main battery voltage and channel 9 can be used to

measure the voltage of the backup battery.

20.4 Fixed threshold comparator

A comparator with a threshold of VREF (1.2 V) is connected to the input of channel 5. The

comparator is asserted whenever the input voltage is in excess of or drops below 1.2 V for at least

10 ms (debouncing) when being enabled via COMP1V2_EN. A status flag COMP_DET indicates the

actual state and a maskable interrupt request E_COMP_v12 is generated at falling and rising edge

state transitions. The comparator has to be disabled via COMP1V2_EN when auto measurements

with high resolution are executed on ADCIN5.

Table 105: R69 to R78

Bit

Type

Label

Default

Description

R69, R70, R71, R72, R73,

R74, R75, R76, R77, R78

7:0

00000000

RESERVED

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