- 您现在的位置：买卖IC网 > PDF目录16567 > EVAL-ADM2914EBZ (Analog Devices Inc)BOARD EVAL FOR ADM2914 PDF资料下载
参数资料
| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM2914 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADM2914 |
| 主要属性： | 电压检测器和监控器 |
| 次要属性： | 开漏极输出 |
| 已供物品： | 板 |
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
相关PDF资料 |
PDF描述 |
|---|---|
| ASPI-7318-R22M-T | INDUCTOR SHIELD 0.22UH SMD |
| HCC05DRYH-S734 | CONN EDGECARD 10POS DIP .100 SLD |
| EVAL-ADMP401Z-FLEX | EVAL BOARD ADMP1062 FLEX |
| TCM809ZVNB713 | IC RESET MONITOR 2.32V SOT23B-3 |
| GBC15DRTS-S734 | CONN EDGECARD 30POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADM3051EBZ | 功能描述:EVAL BOARD FOR ADM3051 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| EVAL-ADM3052EBZ | 功能描述:BOARD EVAL FOR ADM3052EBZ RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:iCoupler® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| EVAL-ADM3053EBZ | 功能描述:BOARD EVAL FOR ADM3053EBZ RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:IsoPower®, iCoupler® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| EVAL-ADM3054EBZ | 功能描述:EVAL BOARD FOR ADM3054 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| EVAL-ADM3251EEB1Z | 功能描述:BOARD EVALUATION FOR ADM3251 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:isoPower® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
发布紧急采购，3分钟左右您将得到回复。