ACT8846 datasheet(33/44 Pages) ACTIVE-SEMI

33 / 44 page

ACT8846

Rev 7.0 06-Dec-2017

Innovative PowerTM

33 -

www.active-semi.com

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of NXP.

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 compares 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

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).

FUNCTIONAL DESCRIPTION

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

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