ACT8846 datasheet(35/63 Pages) QORVO

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ACT8846

Advanced PMU for Multi-core

Application Processors

Data Sheet Rev. 13.0, Nov. 11, 2019 | Subject to change without notice

35 of 63

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FUNCTIONAL DESCRIPTION

I2C Interface

The ACT8846 features an I2C interface that allows

advanced programming capability to enhance overall

system performance. To ensure compatibility with a

wide range of system processors, the I2C interface

supports clock speeds of up to 400kHz (“Fast-Mode”

operation) and uses standard I2C commands. I2C

write-byte commands are used to program the

ACT8846, and I2C read-byte commands are used to

read the ACT8846’s internal registers. The ACT8846

always operates as a slave device, and is addressed

using a 7-bit slave address followed by an eighth bit,

which indicates whether the transaction is a read-

operation or a write-operation, [1011010x].

SDA is a bi-directional data line and SCL is a clock input.

The master device initiates a transaction by issuing a

START condition, defined by SDA transitioning from

high to low while SCL is high. Data is transferred in

8-bit packets, beginning with the MSB, and is clocked-

in on the rising edge of SCL. Each packet of data is

followed by an “Acknowledge” (ACK) bit, used to

confirm that the data was transmitted successfully.

For more information regarding the I2C 2-wire serial

interface, go to the NXP website: http://www.nxp.com.

Housekeeping Functions

Programmable battery Voltage Monitor

The ACT8846 features a programmable battery-voltage

monitor, which monitors the voltage at INL2 (which

should be connected directly to the battery) and com-

pares it to a programmable threshold voltage. The

VBATMON comparator is designed to be immune to

noise resulting from switching, load transients, etc. The

BATMON comparator is disable by default; to enable it,

set the BATLEV[3:0] register to one of the value in Table

4. Note that there is a 200mV hysteresis between the

rising and falling threshold for the comparator. The

VBATDAT [ ] bit reflects the output of the BATMON

comparator. The value of VBATDAT[ ] is 1 when VINL2

< BATLEV; value is 0 otherwise.

The VBATMON comparator can generate an interrupt

when VINL2 is lower than BATLEV[ ] voltage. The

interrupt is masked by default by can be unmasked by

setting VBATMSK[ ] = 1.

Table 4:

BATLEV Falling Threshold

BATLEV[3:0]

BATLEV Falling Threshold

0000

2.5

0001

2.6

0010

2.7

0011

2.8

0100

2.9

0101

3.0

0110

3.1

0111

3.2

1000

3.3

1001

3.4

1010

3.5

1011

3.6

1100

3.7

1101

3.8

1110

3.9

1111

4.0

Thermal Protection

The ACT8846 integrates thermal shutdown protection

circuitry to prevent damage resulting from excessive

thermal stress, as may be encountered under fault

conditions.

Thermal Interrupt

If the thermal interrupt is unmasked (by setting nTMSK[ ]

to 1), ACT8846 can generate an interrupt when the die

temperature reaches 120°C (typ).

Thermal Protection

If the ACT8846 die temperature exceeds 160°C, the

thermal protection circuitry disables all regulators and

prevents the regulators from being enabled until the IC

temperature drops by 20°C (typ).

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