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ACT8849 数据表(PDF) 27 Page - Active-Semi, Inc |
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ACT8849 数据表(HTML) 27 Page - Active-Semi, Inc |
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27 / 35 page  ACT8849 Rev PrB, 12-Jun-14 Innovative PowerTM - 27 - www.active-semi.com Copyright © 2014 Active-Semi, Inc. Active-Semi Confidential―Do Not Copy or Distribute ActivePMU TM is a trademark of Active-Semi. I2CTM is a trademark of NXP. Control Signals Enable Inputs The ACT8849 features a variety of control inputs, which are used to enable and disable outputs depending upon the desired mode of operation. PWREN, PWRHLD are logic inputs, while nPBIN is a unique, multi-function input. nPBIN Multi-Function Input The ACT8849 features the nPBIN multi-function pin, which combines system enable/disable control with a hardware reset function. Select either of the two pin functions by asserting this pin, either through a direct connection to GA, or through a 50kΩ resistor to GA, as shown in Figure 2. Manual Reset Function The second major function of the nPBIN input is to provide a manual-reset input for the processor. To manually-reset the processor, drive nPBIN directly to GA through a low impedance (less than 2.5kΩ). An internal timer detects the duration of the MR event: If the MR is asserted for more than 4s, ACT8849 commences a power cycle routine in which case all regulators are turned off and then turned back on. A status bit, PCSTAT[ ], is set after the power cycle. The PCSTAT[ ] bit is automatically cleared to 0 after read. Figure 2: nPBIN Input nPBSTAT Output nPBSTAT is an open-drain output that reflects the state of the nPBIN input; nPBSTAT is asserted low whenever nPBIN is asserted, and is high-Z otherwise. This output is typically used as an interrupt signal to the processor, to initiate a software-programmable routine such as operating mode selection or to open a menu. Connect nPBSTAT to an appropriate supply voltage through a 10kΩ or greater resistor. nIRQ Output nIRQ is an open-drain output that asserts low any time an interrupt is generated. Connect a 10kΩ or greater pull-up resistor from nIRQ to an appropriate voltage supply. nIRQ is typically used to drive the interrupt input of the system processor. Many of the ACT8849's functions support interrupt- generation as a result of various conditions. These are typically masked by default, but may be unmasked via the I 2C interface. For more information about the available fault conditions, refer to the appropriate sections of this datasheet. |
类似零件编号 - ACT8849 |
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类似说明 - ACT8849 |
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