- 您现在的位置：买卖IC网 > PDF目录69042 > PC34708VMR2 (FREESCALE SEMICONDUCTOR INC) 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA206 PDF资料下载
参数资料
| 型号： | PC34708VMR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA206 |
| 封装： | 13 X 13 MM, 0.80 MM PITCH, LEAD FREE, MO-275HHAC-1, MAPBGA-206 |
| 文件页数： | 144/200页 |
| 文件大小： | 5160K |
| 代理商： | PC34708VMR2 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页当前第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页第171页第172页第173页第174页第175页第176页第177页第178页第179页第180页第181页第182页第183页第184页第185页第186页第187页第188页第189页第190页第191页第192页第193页第194页第195页第196页第197页第198页第199页第200页
Analog Integrated Circuit Device Data
Freescale Semiconductor
48
PC34708
Functional Block Requirements and Behaviors
Power Control Logic Block Description and Application Information
7.2.1.10 Warm Start
Entered upon a Turn On event from User Off. The first 8.0 ms is used for initialization, which includes bias generation, PUMSx
latching, and qualification of the input supply level BP. The switchers and regulators are then powered up sequentially to limit the
inrush current; see Power Up for sequencing and default level details. If SW1, SW2, SW3, SW4, and/or SW5, were configured
to stay on in User Off mode by their SWxUOMODE settings, they will not be turned off when coming out of User Off and entering
a Warm Start. The buck switchers will be reconfigured for their default settings as selected by the PUMSx pins in the respective
time slot defined in the sequencer selection.
RESETB is kept low and RESETBMCU is kept high. CLK32KMCU is kept active if CLK32KMCU was set. The reset timer starts
running when entering Warm Start. When expired, the Warm Start state is exited for the Watchdog state, a WARMI interrupt is
generated, and RESETB will go high.
7.2.1.11 Internal MemHold Power Cut
As described in the Power Cut Description, a momentary power interruption will put the system into the Internal MemHold Power
Cut state if PCUTs are enabled. The backup coin cell will now supply the PC34708 core along with the 32 k crystal oscillator, the
RTC system, and coin cell backed up registers. All regulators and switchers will be shut down to preserve the coin cell and RTC
as long as possible.
Both RESETB and RESETBMCU are tripped, bringing the entire system down along with the supplies and external clock drivers,
so the only recovery out of a Power Cut state is to reestablish power and initiate a Cold Start.
If the PCT timer expires before power is re-established, the system transitions to the Off state and awaits a sufficient supply
recovery.
7.2.2
Power Cut Description
When the supply at VALWAYS drops below the UVDET threshold, due to battery bounce or battery removal, the Internal
MemHold Power Cut mode is entered and a Power Cut (PCUT) timer starts running. The backup coin cell will now supply the
RTC as well as the on chip memory registers and some other power control related bits. All other supplies will be disabled.
The maximum duration of a power cut is determined by the PCUT timer PCT [7:0] preset via the SPI. When a PCUT occurs, the
PCUT timer will be started. The contents of PCT [7:0] does not reflect the actual count down value, but will keep the programmed
value, and therefore does not have to be reprogrammed after each power cut.
If power is not re-established above the LOWBATT threshold before the PCUT timer expires, the state machine transitions to the
Off mode at expiration of the counter, and clears the PCUTEXB bit by setting it to 0. This transition is referred to as an
“unsuccessful” PCUT. In addition the PMIC will bring the SDWNB pin low for one 32 kHz clock cycle before powering down.
Upon re-application of power before expiration (a “successful PCUT”, defined as VALWAYS first rising above the UVDET
threshold and then battery above the LOWBATT threshold before the PCUT timer expires), a Cold Start is engaged after the
UVTIMER has expired.
In order to distinguish a non-PCUT initiated Cold Start from a Cold Start after a PCUT, the PCI interrupt should be checked by
software. The PCI interrupt is cleared by software or when cycling through the Off state.
Because the PCUT system quickly disables the entire power tree, the battery voltage may recover to a level with the appearance
of a valid supply once the battery is unloaded. However, upon a restart of the IC and power sequencer, the surge of current
through the battery and trace impedances can once again cause the BP node to droop below UVDET. This chain of cyclic power
down / power up sequences is referred to as “ambulance mode”, and the power control system includes strategies to minimize
the chance of a product falling into and getting stuck in ambulance mode.
First, the successful recovery out of a PCUT requires the VABTT node to rise above LOBATT threshold, providing hysteretic
margin from the LOBATTT (H to L) threshold. Secondly, the number of times the PCUT mode is entered is counted with the
counter PCCOUNT [3:0], and the allowed count is limited to PCMAXCNT [3:0] set through SPI. When the contents of both
become equal, then the next PCUT will not be supported and the system will go to Off mode, after the PCUT time expires.
After a successful power up after a PCUT (i.e., valid power is reestablished, the system comes out of reset, and the processor
reassumes control), software should clear the PCCOUNT [3:0] counter. Counting of PCUT events is enabled via the
PCCOUNTEN bit. This mode is only supported if the power cut mode feature is enabled by setting the PCEN bit. When not
enabled, then in case of a power failure, the state machine will transition to the Off state. SPI control is not possible during a
相关PDF资料 |
PDF描述 |
|---|---|
| PC34708VM | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA206 |
| PC34708VK | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA206 |
| PCF1252-6T | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| PCF1252-8T-T | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| PCF1252-4T-T | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PC34709VK | 制造商:Freescale Semiconductor 功能描述:PMIC 5SW,6 LDO,BST - Bulk |
| PC34709VKR2 | 制造商:Freescale Semiconductor 功能描述:PMIC 5SW,6 LDO,BST - Tape and Reel |
| PC34710EW | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Adjustable Dual Output Switching Power Supply |
| PC34710EWR2 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Adjustable Dual Output Switching Power Supply |
| PC3-48-12 | 功能描述:DC/DC转换器 3W 12V 0.25A RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
发布紧急采购，3分钟左右您将得到回复。