ADP5360ACBZ-2-R7 datasheet(26/60 Pages) AD

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ADP5360

Data Sheet

Rev. 0 | Page 26 of 60

load current is applied. When the battery voltage reaches terminal

voltage and charging completes, the battery state of the charge

When the state of charge data is lower than the SOC_LOW_TH[1:0]

bits configuration, the interrupt asserts, and the SOCLOW_INT bit

is set high for as long as the low state of the charge interrupt

feature is allowed.

Operation Mode

The ADP5360 fuel gauge default is shutdown mode to provide

extremely low standby current consumption from the battery.

After enabling the fuel gauge function, the state of charge

initializes and calculates the first data only according to the

battery voltage. Two operation modes can be selected: active

and sleep. The I2C controls fuel gauge operation mode selection.

During active mode, the battery state of charge updates every

ten seconds, and the battery voltage and instant current (IINS)

are sampled every second. The new mapping state of charge

compares to the last state of charge value and then updates

using the adaptive state of charge limit. According to the sense

current and input battery capacity, the ADP5360 calculates the

state of charge limit for a state of charge update each cycle.

During sleep mode, the state of charge update cycle is one minute,

and the voltage and the current are sampled every 7.5 seconds.

During this mode, the 12-bitADC uses intervals and shutdown

mode to save as much quiescent current as possible. Table 15

shows the fuel gauge quiescent current,ADC sample rate, and state

of charge update rate. When the sense current is higher than the

sleep current threshold setting (Address 0x27, SLP_CURR[1:0]

bits), the ADP5360 fuel gauge exits sleep mode and enters active

mode automatically.

Battery Capacity Adjustment with Aging

The ADP5360 features record total battery charged energy

reporting when the device powers up, which allows estimation

of battery aging.

The 12 BAT_SOCACM_H and BAT_SOCACM_L bits

accumulate increased state of charge during every charge cycle.

For example, the state of charge increases from 20% to 80%

during charging, and these bits add 60 points. 100 points indicates

one full charge cycle.

When BAT_SOCACM_H and BAT_SOCACM_L increase and

reache 4096 points, and the battery has compiled nearly 41 full

charges, then the BAT_SOCACM_H and BAT_SOCACM_L

bits overflow and clear. The interrupt SOCACM_INT bit in

Regiser 0x34 immediately asserts, and the system can adjust the

BAT_CAP register manually or select automatic adjustment by

setting the EN_BATCAP_AGE bit high. When selecting the

battery aging automatic adjustment function, the battery

capacity reduction proportion can be programmed by the

BATCAP_AGE bits. When enabling this battery capacity aging

automatic adjustment function, the BAT_CAP register cannot be

rewritten to because this register is automatically adjusted by

the ADP5360.

Battery Capacity Adjustment with Temperature

The Li-Ion battery capacity depends on the ambient operation

temperature. The ADP5360 automatically adjusts the battery

capacity calculation value based on the temperature variation

when setting the EN_BATCAP_TEMP bit high. The

temperature information comes from the THR node voltage

sense. Therefore, the battery THR function must be active, and

the EN_THR bit must be set to high.

The BATCAP_TEMP[1:0] bits can program the battery capacity

calculation value adjustment proportion, and this value

decreases as the temperature rises. This battery capacity

adjustment is only effective when the THR node voltage

senses the corresponding range of the TEMP_HIGH_45 to

TEMP_LOW_0 bits (see Figure 52 and Table 17).

TEMPERATURE (°C)

100

105

0.2%/°C

0.4%/°C

0.6%/°C

0.8%/°C

Figure 52. Battery Capacity Adjustment by Temperature in Fuel Gauge

Table 15. Fuel Gauge Operating Mode

Operation Mode

Typical Quiescent Current (μA)

ADC Sample Rate (sec)

State of Charge Update Rate

Sleep

0.2

7.5

1 min

4 min

8 min

16 min

Active

3.5

10 sec

ADP5360ACBZ-2-R7 Datasheet(PDF) 26 Page - Analog Devices

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