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ACT88320QI-T Arkusz danych(PDF) 17 Page - Active-Semi, Inc |
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ACT88320QI-T Arkusz danych(HTML) 17 Page - Active-Semi, Inc |
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17 / 50 page  ACT88320QI-T Rev 2.0, 20-Dec-2017 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi. Copyright © 2017 Active-Semi, Inc 17 SYSTEM CONTROL INFORMATION General The ACT88320 is a single-chip integrated power man- agement solution designed to power many processors such as the Silicon Motion SM2258 and SM2259 solid state drive controllers and the Atmel SAMA5D proces- sors. It integrates three highly efficient buck regulators, two LDOs, an integrated load bypass switch, and a built in inrush and overvoltage controller. Its high integration and high switching frequency result in an extremely small footprint and lost power solution. It contains a master controller that manages startup sequencing, tim- ing, voltages, slew rates, sleep states, and fault condi- tions. I2C configurability allows system level changes without the need for costly PCB changes. The built-in load bypass switch enables full sequencing configura- bility in 3.3V systems. The ACT88320 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 ACT88320 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 ACT88320 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 ACT88320 uses standard I2C commands. The ACT88320 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 ACT88320 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 to not inadvertently change other bits. Inadvertently changing register contents can lead to unexpected device behavior. State Machine Figure 1 shows the ACT88320 internal state machine. |
Podobny numer części - ACT88320QI-T |
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Podobny opis - ACT88320QI-T |
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