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| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/16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 |
( R X ? 0 . 1 %) + ( R Y ? 0 . 1 %) ?
V OV _ MIN = ( 0 . 5 V ? 1 . 5 %) ? 1 +
?
( R Z + 0 . 1 % )
?
?
= 0 . 4925 ? ? 1 +
? ?
ADM2914
THRESHOLD ACCURACY
The reset threshold accuracy is fundamental, especially at lower
voltage levels. Consider an FPGA application that requires a 1 V
core voltage input with tolerance of ±5%, where the supply has a
specified regulation, for example, ±1.5%. As shown in Figure 19, to
ensure that the supply is within the FPGA input voltage require-
ment range, its voltage level must be monitored for UV and OV
conditions. The voltage swing on the supply itself causes the
voltage band available for setting the monitoring threshold to be
quite narrow. In this example, the threshold voltages, including
the tolerances, must fit within a monitor region of only 0.035 V.
The ADM2914 device with 0.1% resistors can achieve this level
of accuracy.
VOLTAGE
Data Sheet
device, including all the tolerance factors, must fit within the
1.015 V to 1.05 V range. Similarly, the UV threshold range must
be between 0.95 V and 0.985 V.
The four worst-case scenarios of minimum and maximum
undervoltage and overvoltage thresholds are calculated as follows:
Minimum overvoltage threshold
?
? ?
? (96,500 + 6420 )(0 . 999) ?
? ( 96 , 500 )( 1 . 001 ) ?
= 1 . 016 V > 1 . 015 V
Maximum overvoltage threshold
V OV _ MAX = ( 0 . 5 V + 1 . 5 %) ? 1 +
?
( R X + 0 . 1 %) + ( R Y + 0 . 1 %) ?
( R Z ? 0 . 1 % )
?
1.05V
1.015V
1V CORE
VOLTAGE
+5% TOLERANCE
3.5% RANGE FOR
OV MONITORING
+1.5% SUPPLY REGULATION
–1.5% SUPPLY
= 1 . 049 V < 1 . 05 V
?
?
?
?
0.985V
0.95V
UV
–5% TOLERANCE
REGULATION
3.5% RANGE FOR
UV MONITORING
t UOTO
The maximum and minimum overvoltage threshold values lie
within the 1.015 V to 1.05 V range specified. The minimum and
maximum undervoltage thresholds are calculated as follows:
Minimum undervoltage threshold
V UV _ MIN = ( 0 . 5 V ? 1 . 5 %) ? 1 +
?
V UV _ MAX = ( 0 . 5 V + 1 . 5 %) ? ? 1 +
( R X ? 0 . 1 %)
?
( R X + 0 . 1 %) ?
( R Y ? 0 . 1 % ) + ( R Z ? 0 . 1 % ) ? ?
TIME
Figure 19. Monitoring Threshold Accuracy Example
VOLTAGE MONITORING EXAMPLE
To illustrate how the ADM2914 device works in a real application,
consider the 1 V input example shown in Figure 19, with the
addition of a ?12 V rail.
The first step is to choose the nominal current flow through
both voltage divider circuits, for example, 5 μA.
?
?
= 0 . 953 V > 0 . 95 V
Maximum undervoltage threshold
?
?
= 0 . 984 V < 0 . 985 V
?
( R Y + 0 . 1 % ) + ( R Z + 0 . 1 % ) ? ?
?
For the 1 V ± 5% input, due to the specified ±1.5% regulation of
the supply, the UV and OV thresholds should be set in the middle
of the voltage monitoring band. In this case, on the ±3.25%
points of the supply, the UV threshold is 0.9675 V and the OV
threshold is 1.0325 V.
Input these values into Equation 1.
Again, these values fit within the specified undervoltage
monitoring range. All four worst-case scenarios satisfy the
tolerance requirement; therefore, the design approach is valid.
–12V RAIL
1V RAIL
5V
R Z =
( 0 . 5 ) ( 1 )
( 1 . 0325 ) ( 5 × 10 ? 6 )
≈ 96 . 5 kΩ
96.5k?
VH1
V CC
OV
R Y =
( 0 . 5 ) ( 1 )
( 0 . 9675 ) ( 5 × 10 ? 6 )
Insert the value of R Z into Equation 2.
? 96 . 5 kΩ ≈ 6 . 42 kΩ
Then substitute the calculated values for R Z and R Y into
Equation 3.
1
R X =
? 96 . 5 kΩ ? 6 . 42 kΩ ≈ 96 . 5 kΩ
5 × 10 ? 6
6.42?
96.5k?
2.49M?
23.4k?
89.8k?
VL1
VL3
VH3
REF
ADM2914
GND
UV
SEL
This design approach meets the application specifications. As
described previously, the 1 V rail is specified with an input
requirement of ±5% and a supply tolerance of ±1.5%. This
effectively means that the OV threshold of the monitoring
Rev. C | Page 10 of 16
Figure 20. Positive and Negative Supply Monitor Example
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