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| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/16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 |
ADM2914
UV/OV OUTPUT CHARACTERISTICS
Both the OV and UV outputs have a strong pull-down to
ground and a weak internal pull-up to V CC . This permits the pins
to behave as open-drain outputs. When the rise time on the pin
is not critical, the weak pull-up removes the requirement for an
external pull-up resistor. The open-drain configuration allows
for wire-OR’ing of outputs, which is particularly useful when
more than one signal needs to pull down on the output.
At V CC = 1 V, a maximum V OL = 0.15 V at UV is guaranteed. At
V CC = 1 V, the weak pull-up current on OV is almost turned on.
Consequently, if the state and pull-up strength of the OV pin are
important at very low V CC , an external pull-up resistor of no more
than 100 k? is advised. By adding an external pull-up resistor,
the pull-up strength on the OV pin is greater. Therefore, if it is
connected in a wire-OR’ed configuration, the pull-down strength
of any single device must account for this additional pull-up
strength.
GLITCH IMMUNITY
The ADM2914 is immune to short transients that may occur
on the monitored voltage rails. The device contains internal
filtering circuitry that provides immunity to fast transient
glitches. Figure 9 illustrates glitch immunity performance by
showing the maximum transient duration without causing a
reset pulse. Glitch immunity makes the ADM2914 suitable for
use in noisy environments.
Data Sheet
UNDERVOLTAGE LOCKOUT (UVLO)
The ADM2914 has an undervoltage lockout circuit that monitors
the voltage on the V CC pin. When the voltage on V CC drops
below 1.9 V (minimum), the circuit is activated. The UV output
is asserted and the OV output is cleared and not allowed to
assert. When V CC recovers, UV exhibits the same timing
characteristics as if an undervoltage condition had occurred
on the inputs.
SHUNT REGULATOR
The ADM2914 is powered via the V CC pin. The V CC pin can
be directly connected to a voltage rail of up to 6 V. In this
mode, the supply current of the device does not exceed
100 μA. An internal shunt regulator allows the ADM2914 to
operate at voltage levels greater than 6 V by simply placing a
dropper resistor in series between the supply rail and the V CC
pin to limit the input current to less than 10 mA.
Once the supply voltage, V IN , has been established, an
appropriate value for the dropper resistor can be calculated.
Begin by determining the maximum supply current
required, I CCtotal , by adding the current drawn from the
reference and/or the pull resistors between the outputs and
the V CC pin to the maximum specified supply current. The
minimum and maximum shunt regulator voltage specified
in Table 1, V SHUNT min and V SHUNT max , are also required in the
following calculations.
Calculate the maximum and minimum dropper resistor
values
R MAX =
V IN min ? V SHUNT max
I CCtotal
R MIN =
V IN max ? V SHUNT min
100 μ
Based on these values, choose a real-world resistor value
within this range. Then, given the specified accuracy of this
resistor, calculate the minimum and maximum real resistor
value variation, R REALmin and R REALmax , respectively.
The maximum device power is calculated as follows:
? ( V IN max ? V SHUNTmax )
P DeviceMax = V SHUNTmax ?
? R REAL min
?
? Icc TOTAL ? +
?
V SHUNTmax I CCtotal
To check that the calculated value of the resistor will be
acceptable, calculate the maximum device temperature rise;
Temp RISEmax = θ JA P DeviceMax
Add this value to the ambient operating temperature. If the
resistor value is acceptable, the result will lie within the
specified operating temperature range of the device, ?40°C
to +85°C.
Rev. C | Page 12 of 16
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