- 您现在的位置：买卖IC网 > PDF目录44717 > LP3972SQX-5810 (NATIONAL SEMICONDUCTOR CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 PDF资料下载
参数资料
| 型号： | LP3972SQX-5810 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| 封装： | 5 X 5 MM, LLP-40 |
| 文件页数： | 44/60页 |
| 文件大小： | 1171K |
| 代理商： | LP3972SQX-5810 |
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页当前第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
WAKE-UP FUNCTIONALITY (PWR_ON, nTEST_JIG,
SPARE AND EXT_WAKEUP)
Three input pins can be used to assert wakeup output for 10
ms for application processor notification to wakeup. SPARE
Input can be programmed through I2C compatible interface to
be active low or high (SPARE bit, Default is active low ‘1’). A
reason for wakeup event can be read through I2C compatible
interface also. Additionally wakeup inputs have 30 ms de-
bounce filtering. Furthermore PWR_ON have distinguishing
between short and long (
1s) pulses (push button input).
LP3972 also has an internal Thermal Shutdown early warning
that generates a wakeup to the system also. This is generated
usually at 125°C.
20207619
WAKEUP register bits
Reason for WAKEUP
WUP0
SPARE
WUP1
TEST_JIG
WUP2
PWR_ON short pulse
WUP3
PWR_ON long pulse
TSD_EW
TSD Early Warning
INTERNAL THERMAL SHUTDOWN PROCEDURE
Thermal shutdown is build to generate early warning (typ.
125°C) which triggers the EXT_WAKEUP for the processor
acknowledge. When a thermal shutdown triggers (typ. 160°
C) the PMU will reset the system until the device cools down.
BATTERY SWITCH AND BACK UP BATTERY CHARGER
When Back-Up battery is connected but the main battery has
been removed or its supply voltage too low, LP3972 uses
Back-Up Battery for generating LDO_RTC voltage. When
Main Battery is available the battery FET switches over to the
main battery for LDO_RTC voltage. When Main battery volt-
age is too low or removed nBATT_FLT is asserted. If no back
up battery exists, the battery switch to back up can be
switched off by nBU_BAT_EN bit. User can set the battery
fault determination voltage and battery charger current via
I2C compatible interface. Enabling of back up battery charger
can be done via serial interface (nBAT_CHG_EN) or external
charger enable pin (nCHG_EN). Pin 29 is set as external
charger enable input by default.
49
www.national.com
LP3972
相关PDF资料 |
PDF描述 |
|---|---|
| LP3972SQXA514 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| LP3972SQ-5810 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| LP3972SQXE514 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| LPB48DP | 2-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE |
| LPB24DP | 2-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3972SQX-5810/NOPB | 功能描述:监控电路 Pwr Mgmt Unit RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| LP3972SQXA413 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Power Management Unit for Advanced Application Processors |
| LP3972SQX-A413 | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| LP3972SQX-A413/NOPB | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| LP3972SQXA514 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Power Management Unit for Advanced Application Processors |
发布紧急采购，3分钟左右您将得到回复。