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| 型号： | ADM2914-1ARQZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR 4CH UV/OV 16-QSOP |
| 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： | 最小为 6 ms |
| 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 |
| 产品目录页面： | 799 (CN2011-ZH PDF) |
Data Sheet
Next, consider a ?12 V input, which is specified with a ±20%
input. The threshold accuracy required by the supply is chosen
to be within ±5% of the ?12 V rail. Therefore, the overvoltage
threshold is set to ?13.5 V, and the undervoltage threshold is
?10.5 V. 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.
ADM2914
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
that is less than the 1.3 μA TIMER pin charging current. To
bypass the timeout period, connect the TIMER pin to V CC .
VHx MONITOR TIMING
( ? 13 . 5 ? 1 ) ( 5 × 10 ? 6 )
Equation 1 becomes
( 0 . 5 ) ( ? 12 ? 1 )
R Z =
≈ 89 . 8 kΩ
VHx
V UOT
t UOD
t UOTO
( ? 10 . 5 ? 1 ) ( 5 × 10 ? 6 )
Insert the value of R Z into Equation 2.
( 0 . 5 ) ( ? 12 ? 1 )
R Y = ? 89 . 8 kΩ ≈ 23 . 4 kΩ
To calculate R X , insert the value of R Z and R Y into Equation 3.
UV
1V
VHx MONITOR TIMING (TIMER PIN TIED TO V CC )
( ? 12 ? 1 ) ? ( 89 . 8 kΩ ) ? ( 23 . 4 kΩ ) ≈ 2 . 49 MΩ
R X =
5 × 10
VHx
V UOT
POWER-UP AND POWER-DOWN
On power-up, when V CC reaches 1 V, the active low UV output
is asserted, and the OV output pulls up to V CC . When the vol-
tage on the V CC pin reaches 1 V, the ADM2914 is guaranteed to
UV
t UOD
1V
t UOD
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
WHEN AN INPUT IS CONFIGURED TO MONITOR A NEGATIVE VOLTAGE,
VHx WILL TRIGGER AN OVERVOLTAGE CONDITION.
Figure 21. VHx Positive Voltage Monitoring Timing Diagram
VLx MONITOR TIMING
UV is an active low output. It is asserted when any of the four
VLx
V UOT
monitored voltages is below its associated threshold. When the
voltage on the V CC pin is above 2 V, an internal timer holds
UV low for an adjustable period, t UOTO , after the voltage on all
the monitoring rails rises 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
OV
t UOD
1V
t UOTO
initiates a timer reset, and the timer starts again when all the
monitoring rails rise above their thresholds.
VLx MONITOR TIMING (TIMER PIN TIED TO V CC )
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.
TIMER CAPACITOR SELECTION
The UV and OV timeout period on the ADM2914 is programma-
ble via the external timer capacitor, C TIMER , placed between the
OV
t UOD
1V
t UOD
TIMER pin and ground. The timeout period, t UOTO , is calculated
using the following equation:
C TIMER = ( t UOTO )( 115 )( 10 ? 9 ) F/sec
WHEN AN INPUT IS CONFIGURED TO MONITOR A NEGATIVE VOLTAGE,
VLx WILL TRIGGER AN UNDERVOLTAGE CONDITION.
Figure 22. VLx Positive Voltage Monitoring Timing Diagram
Rev. C | Page 11 of 16
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相关代理商/技术参数 |
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|---|---|
| ADM2914-1ARQZ-RL7 | 功能描述:IC MONITOR 4CH UV/OV 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM2914-1SRQZEP | 功能描述:IC VOLT SUP QUAD UV/OV 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM2914-1SRQZEP-R7 | 功能描述:IC VOLT SUP QUAD UV/OV 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM2914-2ARQZ | 功能描述:IC MONITOR 4CH UV/OV 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6717 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:2 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:1.11V，3.075V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 产品目录页面:1194 (CN2011-ZH PDF) 其它名称:497-7019-6 |
| ADM2914-2ARQZ | 制造商:Analog Devices 功能描述:IC, VOLT SUPERVISOR 100 uA, 6.9V, QSOP-1 |
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