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ACT8796_08 参数 Datasheet PDF下载

ACT8796_08图片预览
型号: ACT8796_08
PDF下载: 下载PDF文件 查看货源
内容描述: 六通道集成电源管理IC,适用于手持便携式设备 [Six Channel Integrated Power Management IC for Handheld Portable Equipment]
分类和应用: 便携式便携式设备
文件页数/大小: 34 页 / 651 K
品牌: ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
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ACT8796  
Rev1, 10-Oct-08  
SYSTEM MANAGEMENT  
FUNCTIONAL DESCRIPTION (CONT’D)  
nMSTR Enable Input  
nIRQ Output  
In most applications, connect nMSTR to an active  
low, momentary push-button switch to utilize the  
ACT8796's closed-loop enable/disable functionality.  
If a momentary-on switch is not used, drive nMSTR  
to GA or to a logic low to initiate a startup se-  
quence.  
Figure 2 shows two simple circuits that can be used  
to generate nIRQ, a processor interrupt signal,  
which can be used as part of the ACT8796’s push-  
button control logic. This signal is typically used to  
drive the interrupt input of the system processor,  
and is useful in a variety of software-controlled en-  
able/disable control routines. Figure 2A provides an  
active-low, open-collector push-button status output  
that sinks current when nMSTR is driven to a logic-  
low. Figure 2B provides an active-high, open-  
collector push-button status output that sources  
current when nMSTR is driven to a logic-low.  
Enable/Disable Inputs  
The ACT8796 provides two manual enable/disable  
inputs, PWRHLD and ON3. PWRHLD is the master  
enable input. When driven high, PWRHLD enables  
REG1, REG2, and REG4, and also activates the  
enable/disable control logic for the other regulators.  
ON3 is the enable input for REG3, and is active  
when either of the following conditions exists:  
Thermal Shutdown  
The ACT8796 integrates thermal shutdown protec-  
tion circuitry to prevent damage resulting from ex-  
cessive thermal stress, as may be encountered un-  
der fault conditions. This circuitry disables all regu-  
lators if the ACT8796 die temperature exceeds  
160°C, and prevents the regulators from being en-  
abled until the IC temperature drops by 20°C (typ).  
1) nMSTR is asserted low, or  
2) PWRHLD is asserted high.  
Power-On Reset Output  
The ACT8796 integrates a 260ms power-on reset  
generator, reducing system size and cost. nRSTO  
is an open-drain output. Connect a 10kor greater  
pull-up resistor from nRSTO to an appropriate volt-  
age supply. nRSTO asserts low upon startup and  
remains low until the reset-timeout period expires,  
at which point nRSTO goes high-Z.  
Figure 2:  
Simple Circuits  
nMSTR  
OUT2  
INL  
ACT8796  
VCC  
100k  
100k  
500k  
OUT2  
PB  
VCC  
100k  
nIRQ  
nIRQ  
100k  
PB  
ACT8796  
CPU  
(A)  
(B)  
Innovative PowerTM  
- 11 -  
www.active-semi.com  
Copyright © 2008 Active-Semi, Inc.  
ActivePMUTM is a trademark of Active-Semi.  
I2CTM is a trademark of Philips Electronics.