ACT2861 datasheet(48/97 Pages) QORVO

48 / 97 page

Data Sheet Rev. F, April 2022 | Subject to change without notice

48 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

Automatic Polling Conversion

Configure the IC for automatic polling conversion mode

by setting the following I2C bits in register 0x09h

ADC_ONE_SHOT = 0

ADC_CH_SCAN = 1

DIS_ADCBUF = 0

Start the automatic polling by changing EN_ADC to 1.

When in automatic polling mode, the ADC continuously

changes the MUX inputs to read all input channels. The

ADC continually overwrites the data in the output regis-

ter. After all channels have been converted, the

ADC_DATA_READY bit is set to 1. Note that nIRQ is

not asserted low in Automatic Polling mode. Ensure that

ADC

data

valid

and

ready

reading

the

ADC_DATA_READY before reading ADC data. After

the ADC_DATA_READY bit is set to 1, the user defines

the channel to be read with the ADC_CH_READ [2:0]

bits in register 0x0Ah. Change ADC_CH_READ to read

additional channels.

Table 14 shows the equations to convert the ADC data

into the actual measured values. Note that the table re-

fers to the voltages and currents with respect to Charge

mode.

Note that the klim term in the Output Current measure-

ment depends on IC’s operating mode and the

OTG_BAT_ILIM register setting (I2C register 0x10h).

Table 15 shows how to determine the correct klim value.

Table 14: ADC Channels

Channel

Channel Description

ADC_CH_CONV[2:0] ADC_CH_READ[2:0]

Value

CH0

Input Current (IIN)

000

IIN = 0.7633*(ADC_OUT[13:2]-2048)

/RCS_IN/RlLIM

CH1

Input Voltage (VIN)

001

VIN = 0.02035*(ADC_OUT[13:2]-2048)

CH2

Output Voltage (VBAT)

010

VBAT = 0.01527*(ADC_OUT[13:2]-2048)

CH3

Output Current (IBAT)

011

IBAT = klim*0.7633*( ADC_OUT[13:2]-

2048)/RCS_OUT/ROLIM

CH4

100

VTH = 0.003053*( ADC_OUT[13:2]-2048)

CH5

Die Temperature

101

TJ = 0.2707* ADC_OUT[13:2] - 809.49

CH6

ADC Input

110

VADC = 0.001527*(ADC_OUT[13:2]-2048)

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