AN114
Rev 0.2, 01-Nov-2018
I
nnovative Power
TM
ActiveSwitcher
TM
is a trademark of Active-Semi.
1
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. This application note is specific to the Code Matrix Index, CMI 101.
Introduction
The ACT88430 is an ActivePMU power management unit from Active-Semi. It is designed to power a wide
range of processors, FPGA’s, peripherals, microcontroller and solid-state drive applications. The ACT88430
core includes 4 DC/DC step down converters using integrated power FETs and 3 low-dropout regulators (LDOs).
Each regulator can be configured for a wide range of output voltages through the I2C interface.
Today’s processors require more complexity in their startup and sequencing requirements. This is also true for
entering and exiting sleep and low power modes. The ACT88430 is specifically designed to meet today’s
processors’ stringent power system requirements. These processors include, but are not limited to
Atmel SAMA5D, SAMA9G (need updated compatible processors)
Rockchip RK2906, RK2918
Samsung S3C2416, S3C2440, S3C2450
Core Logic
Although the ACT88430 is programmed at the factory with a default configuration, these settings can be
changed through the I2C 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. Active-Semi identifies these
configurations with a Code Matrix Index, CMI. An IC’s CMI is identified 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 the
appropriate application note for register information for other CMI versions.
Register Types
The ACT88430 contains 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
modified at the factory to optimize IC functionality for specific applications. Please consult sales@active-
semi.com for custom options and minimum order quantities.
The ACT88430 contains seven major register spaces.
Master Reg 0x00h to 0x2Fh
Buck1 Reg 0x30h to 0x3Fh
Buck2 Reg 0x40h to 0x4Fh
Buck3 Reg 0x50h to 0x5Fh
Buck4 Reg 0x60h to 0x6Fh
LDO1 Reg 0x70h thru 0x7Fh
LDO23 Reg 0x80h thru 0x8Fh