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| 型号： | ADM6339IARJZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC MCU SUP 5/3.3/2.5/1.8 SOT23-6 |
| 标准包装： | 1 |
| 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 140 ms |
| 电压 - 阀值： | 1.58V，2.19V，2.93V，4.38V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 其它名称： | ADM6339IARJZ-RL7DKR |
ADM6339
THEORY OF OPERATION
The ADM6339 is a compact, low power supervisory circuit that
is capable of monitoring up to four voltages in a multisupply
application.
The device includes several factory-set voltage threshold options
for monitoring ?5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V
supplies. The ADM6339 is available with one to three adjustable
threshold options. The adjustable voltage threshold options
section for a list and description of all available options.
INPUT CONFIGURATION
Built-in hysteresis improves the ADM6339’s immunity to short
input transients, without noticeably reducing the threshold
accuracy. The internal comparators each have a hysteresis of
0.3% with respect to the reset threshold voltage. (The IN 4 input
of the ADM6339Q model has a hysteresis of 0.47% with respect
to its reset threshold voltage of ?0.487 V.)
Monitored inputs are resistant to short power supply glitches.
increase noise immunity in noisy applications, place a 0.1 μF
capacitor between the IN 2 input and ground. Adding capacitance
to IN 1 , IN 3 , and IN 4 also improves noise immunity.
ADM6339
For an input monitor current error of <1%, the resistor network
current should be greater than or equal to 2 mA (for I IN4 = 20 μA
maximum). Set R 2 = 2.5 kΩ. Calculate R 1 based on the desired
V INTH reset threshold voltage, using the following equation:
R 1 = R 2 (( V INTH / V TH ) ? 1)
where:
R 2 ≤ 2.49 kΩ.
V INTH is the desired threshold voltage.
V TH is the internal threshold voltage.
For example, when monitoring a nominal voltage of ?12 V,
V INTH = ?11.1 V, V TH = ?4.63 V, and R 2 = 2.49 kΩ. Therefore,
using the previous equation, R 1 = 3.48 kΩ.
ADM6339
R 2
R 1
V INTH
Figure 14. Negative Voltage Monitoring
USER ADJUSTABLE THRESHOLD OPTIONS
The ADM6339 offers the choice of three adjustable IN x input
threshold voltages: +1.23 V, +0.62 V, or ?0.5 V.
MONITORED
SUPPLIES
IN 1
IN 2
IN 3 RESET
IN 4
MICROPROCESSOR
When using an adjustable threshold of 1.23 V (typical), to
monitor a voltage greater than 1.23 V, connect a resistor divider
network to the device as shown in Figure 15. V INTH , the desired
GND
Figure 13. Typical Applications Circuit
IN 2 must always be used for normal operation because it is the
device’s power supply input. Do not allow unused monitor
inputs to float or to be grounded. Unused IN 3 or IN 4 inputs with
positive thresholds can be connected directly to the IN 2 input.
Unused IN 4 options with negative thresholds must be tied to a
more negative supply.
MONITORING NEGATIVE VOLTAGES < ?5.0 V
A number of ADM6339 models include a pretrimmed threshold
option to monitor ?5.0 V voltage levels. Use a low impedance
resistor divider network similar to that shown in Figure 14 to
monitor supplies more negative than ?5.0 V.
The current through the external resistor divider should be
greater than the input current for the ?5.0 V monitor options.
threshold voltage, can be expressed as
V INTH = 1.23 V(( R 1 + R 2 )/( R 2 ))
The ADM6339 has a guaranteed input current of ±0.1 μA on its
1.23 V adjustable input. Resistor values up to 100 kΩ can be
used for R 2 with <1% error.
V INTH
ADM6339
R 1
R 2
V REF = 1.23V
Figure 15. Setting the 1.23 V Adjustable Monitor
The same approach is taken when using the 0.62 V (typical)
adjustable threshold input. Use the following equation to solve
for the values of R 1 and R 2 :
V INTH = 0.62 V(( R 1 + R 2 )/( R 2 ))
The 0.62 V (typical) adjustable threshold input offers high
threshold accuracy of ±0.8%.
Rev. A | Page 8 of 12
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| ADM6339JARJZ-RL7 | 功能描述:IC MCU SUP 5/3.3/2.5/1.8 SOT23-6 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 |
| ADM6339KARJZ-RL7 | 功能描述:IC MCU SUP ADJ/33/25/ADJ SOT23-6 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 |
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