ACT4911 datasheet(25/33 Pages) QORVO

25 / 33 page

Data Sheet Rev. C, August 2021 | Subject to change without notice

25 of 33

www.qorvo.com

ACT4911

Power Loss Protection with 6A eFuse

6 to 1

MUX

ADC

CH0

CH1

CH5

CH2

8 Bit

Result

Clock

SEL[2:0]

Figure 7: ADC Block Diagram

Automatic Polling Conversion

Configure the IC for automatic polling conversion mode

by setting the following I2C bits in register 0x08h

ADC_ONE_SHOT = 0

ADC_CH_SCAN = 1

EN_ADCBUF = 1

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

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_CONV [2:0] bits

in register 0x08h. Change ADC_CH_CONV to read

additional channels.

Table 8: ADC Channels

Channel Channel Description

ADC_CH_CONV[2:0]

ADC_CH_READ[2:0]

Value

CH0

Input Current

000

IIN = (DOUT-128)*1.221/RILIM (A)

CH1

Input Voltage

001

VIN = (DOUT-128)*0.392 (V)

CH2

Storage Cap Voltage

010

VSTR = (DOUT-128)*0.392 (V)

CH3

Output Voltage

011

VOUT = (DOUT-128)*0.392 (V)

CH4

Die Temperature

100

Temp = 6.125*DOUT-1053.75 (deg C)

CH5

GND

101

Autonomous ADC Supervisory Function

The ACT4911 can be configured to automatically

measure any or all of the five system level parameters

and then then automatically notify the system if one of

the parameters falls out of its specified range. This

check is performed automatically, without any external

circuit components. The ACT4911 implements this

using internal digital undervoltage and overvoltage

comparators for all five ADC channels. Table 9 shows

each ADC channel’s undervoltage and overvoltage

registers. When in automatic polling mode, if an ADC

conversion result is below the undervoltage threshold or

above the overvoltage threshold, the IC asserts nIRQ

low. The uP can then read the status register 0x04h to

determine which parameter is out of range. nIRQ can

be masked by setting the ADC_OUTRNG_IRQ_MASK

bit. The default thresholds are determined by each ICs

CMI, but can be changed at any time after startup.

Disable

channel’s

supervisory

function

programming the undervoltage register value to 0x00h

and the overvoltage register to 0xFFh.

Table 9: ADC Thresholds Registers

Undervoltage

Threshold

Overvoltage

Threshold

Input Current

0x0Ch

0x14h

Input Voltage

0x0Dh

0x15h

Storage Cap Voltage 0x0Eh

0x16h

Output Voltage

0x0Fh

0x17h

Die Temperature

0x10h

0x18h

ACT4911 Datasheet(PDF) 25 Page - Qorvo, Inc

ACT4911 Datasheet(HTML) 25 Page - Qorvo, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL