anuary 2021 Rev 1.0 | Subject to change without notice

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APPLICATION NOTE AN-114

ACT88430 Register Definitions – CMI 101

Abstract

This application note identifies and explains the ACT88430 internal registers that help make this IC flexible and configurable for many

applications. It provides a short description of each register, its individual bits, their function, and default values. The default register

settings in this application note are only va lid for the ACT88430VM101. Refer to each datasheet for each specific IC’s functional

differences from the settings in this document.

Introduction

The ACT88430 is an ActiveP MU ™ power management unit from Qorvo. It is designed to power a wide range of processors, FPGA’s,

peripherals, and microcontrollers. The ACT88430 core includes four DC/DC step down converters using integrated power FETs and

three LDOs. Each of these regulators can be configured for a wide range of output voltages through the I

C interface.

Today’s applications require m ore comp lex ity in their star tup and sequ enc ing requir e ment s. The ACT88430 I

C registers allow for

customized configurations for these requirements. Although the ACT88430 is progr a m med at the factor y with a default configuration,

these settings can be changed through the I

C interface to provide customized configurations optimized for a specific processor and/or

end application. IC configurability includes many options such as output voltage, startup sequencing, startup timing, slew rates, GPIO

configuration, fault responses, and more. Qorvo identifies these configurations with a Code Matrix Index, CMI. An IC’s CMI is identifi ed

by the last three digits at the end of the orderable part number. Note that this application note is specific to the ACT88430’s CMI 101.

Refer to t he data she et for the specifi c changes to other CMI vers ions.

The ACT88430 ICs contain the following register types.

Basic Volatile - Customer R/W (Read and Write) and RO (Read only). The customer can modify these register values to change IC

functionality. Any changes to these registers are lost when power is recycled. The default values are fixed and cannot be changed.

Basic Non-Volatile - Customer R/W and RO. The customer can modify these register values to change IC functionality. Any

changes to these registers are lost when power is recycled. The default values can be modifie d at the factor y to opti miz e IC

functionality for specific applications. Please consult Sales@Qorvo.com for custom opti on s and mini mu m order quantities.

Factory Non-Volatile – Factory bits. These bits are used by the factory to set IC functionality. The customer can read these bits

but cannot write to them. The default values can be modified at the factory to optimize IC functionality for specif ic app lic ati ons.

The ACT88430 cont ai ns seve n major re gis ter spa ces .

Master (or System) Reg 0x00h to 0x0Ah

Buck1 Reg 0x30h to 0x36h

Buck2 Reg 0x40h to 0x46h

Buck3 Reg 0x50h to 0x56h

Buck4 Reg 0x60h to 0x66h

LDO1 Reg 0x70h to 0x74h

Current Limit Reg 0x79h to 0x7Ch

LDO2 Reg 0x80h to 0x84h

LDO3 Reg 0x88h to 0x8Ch