ACT88326VA datasheet(16/41 Pages) ACTIVE-SEMI

16 / 41 page

ACT88326VA

Rev 1.0, 29-May-2018

Innovative PowerTM

www.active-semi.com

ActiveSwitcherTM is a trademark of Active-Semi.

SYSTEM CONTROL INFORMATION

General

The ACT88326 is a single-chip integrated power man-

agement solution designed to power many processors

such as the Silicon Motion SM2258/59/62/63/63XT

solid state drive controllers and the Atmel SAMA5D pro-

cessors. It integrates three highly efficient buck regula-

tors, two LDOs, and an integrated load bypass switch.

Its high integration and high switching frequency result

in an extremely small footprint and low cost power solu-

tion. It contains a master controller that manages

startup sequencing, timing, voltages, slew rates, sleep

states, and fault conditions. I2C configurability allows

system level changes without the need for costly PCB

changes. The built-in load bypass switch enables full

sequencing configurability in 3.3V systems.

The ACT88326 master controller monitors all outputs

and reports faults via I2C and hardwired status signals.

Faults can be masked and fault levels and responses

are configurable via I2C.

Many of the ACT88326 pins and functions are configu-

rable. The IC’s default functionality is defined by the de-

fault CMI (Code Matrix Index), but much of this function-

ality can be changed via I2C. Several GPIOs can be

configured as enable inputs, reset outputs, dynamic

voltage (DVS) inputs, LED drivers, etc. The GPIO con-

figuration is specifically defined for each ACT88326 or-

derable part number. The first part of the datasheet de-

scribes basic IC functionality and default pin functions.

The end of the datasheet provides the configuration and

functionality specific to each CMI version. Contact

sales@active-semi.com for additional information about

other configurations.

I2C Serial Interface

To ensure compatibility with a wide range of systems,

the ACT88326 uses standard I2C commands. The

ACT88326 operates as a slave device, and can be fac-

tory configured to one of four 7-bit slave addresses. The

7-bit slave address is followed by an eighth bit, which

indicates whether the transaction is a read-operation or

a write-operation. Refer to each specific CMI for the IC’s

slave address

7-Bit Slave Address

8-Bit Write

Address

8-Bit Read

Address

0x25h

010 0101b

0x4Ah

0x4Bh

0x27h

010 0111b

0x4Eh

0x4Fh

0x67h

110 0111b

0xCEh

0xCFh

0x6Bh

110 1011b

0xD6h

0xD7h

There is no timeout function in the I2C packet pro-

cessing state machine, however, any time the I2C state

machine receives a start bit command, it immediately

resets the packet processing, even if it is in the middle

of a valid packet. The I2C functionality is operational in

all states except RESET.

I2C commands are communicated using the SCL and

SDA pins. SCL is the I2C serial clock input. SDA is the

data input and output. SDA is open drain and must have

a pull-up resistor. Signals on these pins must meet

timing requirements in the Electrical Characteristics

Table.

I2C Registers

The ACT88326 contains an array of internal registers

that contain the IC’s basic instructions for setting up the

IC configuration, output voltages, sequencing, fault

thresholds, fault masks, etc. These registers are what

give the IC its operating flexibility. The two types of

registers are described below.

Basic Volatile – These are R/W (Read and Write) and

RO (Read only). After the IC is powered, the user can

modify the R/W register values to change IC

functionality. Changes in functionality include things like

masking certain faults. The RO registers communicate

IC status such as fault conditions. Any changes to these

registers are lost when power is recycled. The default

values are fixed and cannot be changed by the factory

or the end user.

Basic Non-Volatile – These are R/W and RO. After the

IC is powered, the user can modify the R/W register

values to change IC functionality. Changes in

functionality include things like output voltage settings,

startup delay time, and current limit thresholds. Any

changes to these registers are lost when power is

recycled. The default values can be modified at the

factory to optimize IC functionality for specific

applications. Please consult sales@active-semi.com for

custom options and minimum order quantities.

When modifying only certain bits within a register, take

care

not

inadvertently

change

other

bits.

Inadvertently changing register contents can lead to

unexpected device behavior.

State Machine

Figure 1 shows the ACT88326 internal state machine.

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