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参数资料
| 型号： | MAX6849KAZD7+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MON ADJ SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 电池监控器 |
| 电池化学： | 碱性，锂离子，镍镉，镍金属氢化物 |
| 电源电压： | 1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Low-Power, Adjustable Battery Monitors with
Hysteresis and Integrated μP Reset
Manual Reset
Many microprocessor-based products require manual
reset capability, allowing the operator, a test technician,
V DD
V DD
LBO*
or external logic circuitry to initiate a reset while the
monitored supplies remain above their reset thresholds.
These devices have a dedicated active-low MR pin.
When MR is pulled low, RESET asserts a one-shot low
pulse for the MR reset timeout period. The MR input has
an internal 1.5k ? pullup resistor to V CC and can be left
unconnected if not used. MR can be driven with CMOS-
R1
R2
LTHIN
MAX6846
MAX6847
MAX6848
MAX6849
(LBOH)
(LBOL)
logic levels, open-drain/open-collector outputs, or a
momentary pushbutton switch to GND (the MR function
is internally debounced for the t DEB timeout period) to
create a manual reset function. If MR is driven from long
cables, or if the device is used in a noisy environment,
R3
HTHIN
GND
connect a 0.1μF capacitor from MR to GND to provide
additional noise immunity (see Figure 4).
Hysteresis
Hysteresis increases the comparator’s noise margin by
increasing the upper threshold or decreasing the lower
threshold. The hysteresis prevents the output from
oscillating (chattering) when monitor input is near the
* FOR THE MAX6846/MAX6847.
( ) FOR THE MAX6848/MAX6849.
Figure 5. Adjustable Threshold Selection
2) Calculate R3 based on R TOTAL and the desired
upper trip point:
low-battery threshold. This is especially important for
applications where the load on the battery creates sig-
nificant fluctuations in battery voltages (see Figures 2
and 3).
R 3 =
615mV × R TOTAL
V TRIPHIGH
R 2 = ?
? - R 3
For the MAX6846/MAX6847, hysteresis is set using three
external resistors (see Figure 5). The MAX6848/MAX6849
have dual, low-battery input levels. Each input level has a
5% (typ) hysteresis.
Applications Information
Resistor-Value Selection (Programming
the Adjustable Thresholds)
MAX6846/MAX6847
3) Calculate R2 based on R TOTAL , R3, and the desired
lower trip point:
? 615mV × R TOTAL ?
? V TRIPLOW ?
4) Calculate R1 based on R TOTAL , R3, and R2:
R 1 = R TOTAL - R 2 - R 3
V LTH = V HTH = 615 mV
V LTH- = V HTH- = 582mV
MAX6848/MAX6849
V TRIPLOW = V LTH × ?
R 2 + R 3
?
?
V TRIPHIGH HTH × ?
? R 1 + R 2 + R 3 ?
?
?
V TRIPLOW LTH - × ?
? R 1 + R 2 + R 3 ?
?
R 2 + R 3
V TRIPHIGH HTH - × ?
? R 1 + R 2 + R 3 ?
?
?
? R 1 + R 2 + R 3 ?
?
= V ?
R 3
R TOTAL = R 1 + R 2 + R 3
Use the following steps to determine values for R1, R2,
and R3 of Figure 5.
1) Choose a value for R TOTAL , the sum of R1, R2, and
R3. Because the MAX6846/MAX6847 have very high
input impedance, R TOTAL can be up to 500k ? .
LBOL low-trip level:
= V
? ?
LBOH low-trip level:
= V ?
R 3
R TOTAL = R 1 + R 2 + R 3
Use the following steps to determine values for R1, R2,
and R3 of Figure 5.
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| MAX684EUA | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX684EUA+ | 功能描述:电荷泵 3.3Vin to Reg 5Vout Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX684EUA+T | 功能描述:电荷泵 3.3Vin to Reg 5Vout Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX684EUA-T | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX6850AEE | 功能描述:VFD驱动器 RoHS:否 制造商:Maxim Integrated 工作电源电压:8 V to 76 V, 3 V to 5.5 V 电源电流:0.9 mA, 700 uA 最大工作温度:+ 125 C 封装 / 箱体:SOIC-20 封装:Tube |
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