IC Protocol for programming the ACT8945A TABLE OF CONTENTS 1. INTRODUCTION

IC Protocol for programming the ACT8945A TABLE OF CONTENTS 1. INTRODUCTION

7 Pages · 2013 · 92 KB · English

standard I2C commands. I2C write-byte commands are used to program the ACT8945A, and I2C read- byte commands are used to read the ACT8945A's internal registers. The ACT8945A always operates as a slave device, and is addressed using a 7-bit slave address followed by an eighth bit, which.

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Innovative Power TM 1 wwwactivesemicom Copyright © 2013 ActiveSemi, Inc AN I2C Protocol for programming the ACT8945A TABLE OF CONTENTS 1 INTRODUCTION 1 2 PROGRAMMING THE ACT8945A 2 21 ENABLE / DISABLE CONTROL 2 22 STEPDOWN DC/DC OUTPUT VOLTAGE SETTING 2 23 LDO OUTPUT VOLTAGE SETTING 3 24 PROGRAM SYSTEM VOLTAGE MONITOR 3 25 REGULATORS TURNON DELAY 4 26 POWEROK AND OUTPUT FAULT INTERRUPT 4 27 LDO OUTPUT DISCHARGE SETTING 4 28 LDO LOWPOWER MODE SETTING 5 29 ActivePath TM INPUT OVERVOLTAGE 5 210 ActivePathTM CHARGER INTERRUPTS SETTING 5 2101 Input Interrupts 5 2102 State Machine Interrupts 5 2103 Battery Temperature Interrupt 6 2104 Charger Timer Interrupts 6 211 CHARGE SAFETY TIMERS 6 Rev 0, 11Oct13 1 INTRODUCTION The ACT8945A is a complete, cost effective, highly efficient ActivePMU TM power management solution, optimized for the unique power, voltage sequencing, and control requirements of the Atmel SAMA5D3 series: SAMA5D[31/33/34/35/36], and Atmel SAM9 series: SAM9G[15/25/35/45/46], SAM9X[25/35], SAM9M[10/11], SAM9N[11/12] processors It is ideal for a wide range of high performance portable handheld applications such as humanmachine interfaces, control panels, smart grid infrastructures, network gateways, M2M systems, 2D barcode scanners, barcode printers, machine vision equipment, as well as home and commercial building automations, POS terminals, medical devices and white goods This device integrates the ActivePath TM complete battery charging and management system with seven power supply channels The ACT8945A features an I 2C interface that allows advanced programming capability to enhance overall system performance To ensure compatibility with a wide range of system processors, the I 2C interface supports clock speeds of up to 400kHz (“FastMode” operation) and uses standard I 2C commands I 2C writebyte commands are used to program the ACT8945A, and I 2C read byte commands are used to read the ACT8945A’s internal registers The ACT8945A always operates as a slave device, and is addressed using a 7bit slave address followed by an eighth bit, which indicates whether the transaction is a read operation or a writeoperation, [1011011x] SDA is a bidirectional 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 8bit packets, beginning with the MSB, and is lockedin 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 This application note describes how the ACT8945A can be programmed via the I 2C interface AN Rev 0, 11Oct13 Innovative Power TM 2 wwwactivesemicom Copyright © 2013 ActiveSemi, Inc 2 PROGRAMMING THE ACT8945A 21 ENABLE / DISABLE CONTROL During normal operation, each regulator may be enabled or disabled via the I 2C interface by writing to that regulator's ON[ ] bit The regulator accept rising or falling edge of ON[ ] bit as on/off signal To enable the regulator, clear ON[ ] to 0 first then set to 1 To disable the regulator, set ON[ ] to 1 first then clear it to 0 All regulators can be disabled by setting MSTROFF [ ] bit to 1 Address of ON[ ] bit of each DC/DC and MSTROFF [ ] bit is

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