参数资料
| 型号： | ADM12914-2ARQZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR QUAD UV/OV 16QSOP |
| 产品培训模块： | Voltage Supervisor 101 |
| 标准包装： | 98 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
ADM12914
Next, consider a ?5 V input, which is specified with a ±12%
input. The threshold accuracy required by the supply is chosen
to be within ±5% of the ?5 V rail. The UV and OV threshold
should be set in the middle of the undervoltage and overvoltage
monitoring bands, respectively. In this case, on the ±8.5%
points of the supply, which is ?4.575 V for the UV threshold
and ?5.425 V for the OV threshold.
The negative voltage scheme configuration requires that the 1 V
reference voltage be accounted for in Equation 1 to Equation 3.
The 1 V reference voltage is subtracted from V M , V UV , and V OV ,
and the absolute value of the result is taken.
Data Sheet
TIMER CAPACITOR SELECTION
The UV and OV timeout period on the ADM12914 is program-
mable via the external timer capacitor, C TIMER , placed between
the TIMER pin and ground. The timeout period, t UOTO , is
calculated using the following equation:
C TIMER = ( t UOTO )(115)(10 ?9 ) F/sec
section, which illustrates the delay time as a function of the
timer capacitor value. A minimum capacitor value of 10 pF is
required. The chosen timer capacitor must have a leakage current
?
? ? 5 . 425 ? 1 ? 5 ? 10 ? 6
Equation 1 becomes
( 0 . 5 ) ? ? 5 ? 1 ?
R Z ?
?
? 93 . 1 kΩ
that is less than the 1.7 μA TIMER pin charging current. To
bypass the timeout period, connect the TIMER pin to V CC .
VHx MONITOR TIMING
VHx V UOT
? ? 4 . 575 ? 1 ? ? 5 ? 10 ? 6 ?
Insert the value of R Z into Equation 2
( 0 . 5 ) ? ? 5 ? 1 ?
R Y ? ? 93 . 1 kΩ ? 14 . 3 kΩ
UV
t UOD
1V
t UOTO
To calculate R X , insert the value of R Z and R Y into Equation 3.
? ? 5 ? 1 ? ? ? 14 . 3 k Ω ? ? ? 93 . 1 k Ω ? ? 1 . 09 MΩ
R X ?
5 ? 10
VHx MONITOR TIMING
(TIMER PIN TIED TO V CC )
POWER-UP AND POWER-DOWN
VHx
V UOT
On power-up, when V CC reaches 1 V, the active low UV output
asserts and the OV output pulls up to V CC . When the voltage on
t UOD
t UOD
UV
the V CC pin reaches 1 V, the ADM12914 is guaranteed to assert
UV low and OV high. When V CC exceeds 1.9 V (minimum), the
VHx and VLx inputs take control. When V CC and each of the
VHx inputs are valid, an internal timer begins. Subsequent to
an adjustable time delay, UV weakly pulls high.
UV/OV TIMING CHARACTERISTICS
1V
NOTES
1. WHEN AN INPUT IS CONFIGURED TO MONITOR A NEGATIVE
VOLTAGE, VHx TRIGGERS AN OVERVOLTAGE CONDITION.
Figure 21. VHx Positive Voltage Monitoring Timing Diagrams
VLx MONITOR TIMING
UV is an active low output. It asserts when any of the four moni-
VLx
V UOT
tored voltages is below its associated threshold. When the
voltage on the V CC pin is greater than 2 V, an internal timer
holds UV low for an adjustable period, t UOTO , after the voltages
on all the monitoring rails rise above their thresholds. This
allows time for all monitored power supplies to stabilize after
power-up. Similarly, any monitored voltage that falls below its
threshold initiates a timer reset, and the internal timer restarts
OV
t UOD
1V
t UOTO
VLx MONITOR TIMING
(TIMER PIN TIED TO V CC )
once all the monitoring rails rise above their thresholds.
The UV and OV outputs are held asserted after all faults have
VLx
V UOT
cleared for an adjustable timeout period, determined by the
value of the external capacitor attached to the TIMER pin.
OV
t UOD
1V
t UOD
NOTES
1. WHEN AN INPUT IS CONFIGURED TO MONITOR A NEGATIVE
VOLTAGE, VLx TRIGGERS AN UNDERVOLTAGE CONDITION.
Figure 22. VLx Positive Voltage Monitoring Timing Diagrams
Rev. D | Page 12 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM12914-2ARQZ-RL7 | 制造商:Analog Devices 功能描述: |
| ADM1293-1AACPZ | 功能描述:IC MONITOR QUAD UV/OV 16LFCSP 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-LFCSP-WQ（4x4） 标准包装:1 |
| ADM1293-1AACPZ-RL7 | 功能描述:IC MONITOR QUAD UV/OV 16LFCSP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-LFCSP-WQ（4x4） 标准包装:1,500 |
| ADM1293-1AARUZ | 功能描述:IC MONITOR QUAD UV/OV 14TSSOP 制造商:analog devices inc. 系列:- 包装:管件 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:14-TSSOP 标准包装:96 |
| ADM1293-1AARUZ-RL7 | 功能描述:IC MONITOR QUAD UV/OV 14TSSOP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:14-TSSOP 标准包装:1,000 |
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