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| 型号： | MAX8215CSD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR VOLT MPU 14-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 5 |
| 输出： | 开路漏极或开路集电极 |
| 复位超时： | 标准传输延迟为 20 µs |
| 电压 - 阀值： | ±5V，±12V，可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
±5V, ±12V (±15V) Dedicated
Microprocessor Voltage Monitors
+5V
0.1 μ F
V TRIP2
INPUT VOLTAGE
8
(V S )
V TRIP1
2 GND
PGND
V DD
14
680k
680k
OUTPUT
GND
VOLTAGE
+V S
3
+5V
MAX8215
MAX8216
OUT1
13
(OUT1)
V DD
GND
t DLY
OUTPUT
V DD
7
DIN
DOUT
9
RESET
VOLTAGE
(DOUT)
GND
)
(
t DLY = -RC In 1 - V
1 μ F
Figure 5. Microprocessor Reset Circuit with 200ms Time Delay
Monitoring the Supply Voltage
The supply voltage to these devices can also be moni-
tored by the 5V dedicated comparator and the auxiliary
comparator. Figure 4 shows a circuit that monitors the
voltage connected at V DD for both overvoltage and
undervoltage conditions. The +5V comparator checks
for undervoltage conditions while the auxiliary compara-
tor monitors overvoltage conditions. In general, no extra
supply bypassing circuitry (other than the normally rec-
ommended 0.1μF capacitor) is required when perform-
ing this function. However, using resistor values higher
than 100k ? at the auxiliary comparator’s input requires
attention to eliminate potential oscillations. Also, partic-
ularly low pull-up resistor values on DOUT contribute to
the likelihood of the auxiliary comparator’s oscillation.
See the section Eliminating Output Oscillation .
Microprocessor Reset
____________Circuit with Time Delay
It is often necessary to reset a microprocessor (μP) when
its supply voltage drops below a certain level. Figure 5’s
circuit generates a low output when the monitored volt-
age drops below the 5V monitor’s threshold. Additionally,
this output remains low for 200ms after the supply voltage
goes above the threshold. μP reset circuits typically
include this feature because it gives the μP time to be
fully reset after power has been restored, and allows any
capacitors in associated circuitry time to charge. Figure
6 shows this circuit’s waveforms and formulas.
V TRIP1 IS FOR V S DECREASING; V REF
V TRIP2 IS FOR V S INCREASING. CC
NOTE: V TH IS THE VOLTAGE AT THE INVERTING PIN OF THE TWO COMPARATORS.
IN THIS CASE, IT IS EQUAL TO THE INTERNAL REFERENCE VOLTAGE.
Figure 6. Microprocessor Reset with Time Delay Waveforms
Figure 7 shows Figure 5’s μP reset circuit, but with the
monitored supply also powering the MAX8215. Figure
6’s waveforms and equations also apply to this circuit.
The MAX8215/MAX8216 comparator outputs correctly
display a low level down to a 0.8V typical supply voltage.
Unused Inputs
When the uncommitted comparator within the
MAX8215/MAX8216 is not used, tie the unused input to
either the positive supply or ground. This prevents noise
generation due to the comparator output switching from
one logic state to another (due to noise at the input).
Output Pull-Up Resistors
Pull-up resistors are required at the outputs of each
comparator. Resistor values should not be less than
2.7k ? if the outputs are pulled up to V DD . In general,
save power by using higher values, e.g., ≥ 100k ? . Use
of higher-value resistors also minimizes the possibility
of oscillations due to a spurious feedback (see the sec-
tion Eliminating Output Oscillation ).
Input Voltage Limitation
If the voltages at the various inputs are kept within the
absolute maximum ratings, the device is not damaged.
However, high input voltages within this range can
cause the reference voltage to move. To prevent the
reference voltage from changing, limit the +5V input to
+17V; the -5V and -15V inputs to +1V; and the +15V
input to +60V. Negative input voltages within the
8
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| MAX8215CSD-TG068 | 制造商:Maxim Integrated Products 功能描述:+/- 5V, +/- 12V DEDICATED MICROPROCESSOR VOLT - Bulk |
| MAX8215EJD | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX8215EPD | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX8215EPD+ | 功能描述:监控电路 5/12/15V +/-Dedictd MPU Voltage Monitor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX8215ESD | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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