ACT5101 datasheet(28/59 Pages) QORVO

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Data Sheet Rev. E, November 2019 | Subject to change without notice

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ACT510x

23V Buck-Boost Converter with Integrated MOSFETs

ADC MONITORING

General Description

The ACT510x contains a built-in analog to digital

converter, ADC, which can be used to monitor six

system level parameters. These include input voltage,

output voltage, input current, output current, die

temperature, and the external ADC input pin. It uses a

single 12 bit delta-sigma ADC that uses an analog input

multiplexer to select one of seven channels for the A/D

conversion. The resulting digital results are stored in

seven digital registers. A seven to one multiplexer

connects one of the ADC output registers to the user

accessible register map.

ADC Configuration

The ACT510x ADC is configured through the I2C

interface. It is enabled and disabled by the I2C bit

EN_ADC in register 0x09h. The ADC has two

conversion modes, manual single-shot conversion and

automatic polling conversion.

Single-Shot Conversion

Configure the IC for single-shot conversion mode by

setting the following I2C bits in register 0x09h

ADC_ONE_SHOT = 1.

ADC_CH_SCAN = 0

DIS_ADCBUF = 0

In single shot mode, the user defines the input channel

to be converted and then manually initiates the ADC

conversion. I2C bits ADC_CH_CONV [2:0] in register

0x0Ah select the input channel to be converted.

ADC_CH_READ [2:0] selects the ADC channel to be

read. These should be set to the same channel. The

user initiates an ADC read by writing a 1 into EN_ADC

in register 0x09h. When ADC conversion is complete,

the ADC_DATA_READY bit in register 0x0Ah is set to

1, nIRQ is asserted low, and EN_ADC bit automatically

changes back to 0. The uP can then read the status bits

to find that the ADC conversion is complete. The ADC

data are stored in ADC_OUT [13:6] in register 0x07h

and ADC_OUT[5:2] in register 0x08h. nIRQ stays

asserted low and the ADC_READY_BIT stays equal to

1 until the ADC data is read. Reading the ADC data au-

tomatically deasserts nIRQ. To initiate another ADC

conversion for the same channel, set EN_ADC=1. To

initiate an ADC conversion for another channel, change

ADC_CH_CONV and ADC_CH_READ to the appropri-

ate channel and then set EN_ADC=1.

7 to 1

MUX

ADC

CH0

CH1

CH6

CH2

12 Bit

Result

Clock

SEL[2:0]

Figure 12: ADC Block Diagram

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

ADC_DATA_READY bit is set to 1. Note that nIRQ is

not asserted low in Automatic Polling mode. Ensure that

ADC data

is valid and ready by 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 [2:0] to

read additional channels.

Table 10 shows the equations to convert the ADC data

into the actual measured values. Note that the klim term

in the Input Current measurement depends on the IC’s

INPUT_ILIM register setting (I2C register 0x10h). Table

11 shows how to determine the correct klim value.

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