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参数资料
| 型号： | MAX16021LTEY+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR PP 2.192V 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小 145 ms |
| 电压 - 阀值： | 2.192V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Low-Power μP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
Watchdog Timer
Watchdog Input
The watchdog monitors μP activity through the input
WDI. If the μP becomes inactive, either the reset output is
asserted in pulses (MAX16016) or the watchdog output
goes low (MAX16020/MAX16021). To use the watchdog
function, connect WDI to a bus line or μP I/O line. If WDI
remains high or low for longer than the watchdog timeout
period, the internal watchdog timer runs out and RESET
asserts for the reset timeout period (MAX16016) or WDO
goes low (MAX16020/MAX16021). The internal watchdog
timer clears whenever the reset output asserts or the
WDI sees a rising or falling edge within the watchdog
timeout period. The WDI input is designed for a three-
stated output device with a 10μA maximum leakage cur-
rent and the capability of driving a maximum capacitive
load of 200pF. The three-state device must be able to
source and sink at least 200μA when active. Disable the
watchdog timer by leaving WDI unconnected or by
three-stating the driver connected to WDI. The watchdog
timer periodically attempts to pulse WDI to the opposite
logic-level through a 25k ? resistor for 40μs to determine
whether WDI is either unconnected or latched to a logic
state. The watchdog function is also disabled when in
battery-backup mode.
Watchdog Output
WDO remains high if there is a transition or pulse at WDI
during the watchdog-timeout period. WDO goes low if no
transition occurs at WDI during the watchdog timeout
period and remains low until the next transition at WDI or
when a reset is asserted. Connect WDO to MR to gener-
ate a system reset on every watchdog fault. When a
watchdog fault occurs in this mode, WDO goes low,
which pulls MR low, causing a reset pulse to be issued.
As soon as the reset output is asserted, the watchdog
timer clears and WDO returns high. With WDO connect-
ed to MR , a continuous high or low on WDI causes
145ms (min) reset pulses to be issued every 1.235s.
Battery Testing Function/BATTOK
Indicator (MAX16020/MAX16021)
The MAX16020/MAX16021 feature a battery testing
function that works in conjunction with the BATTOK out-
put. The battery voltage is tested for 1.235s after V CC is
applied and once every 24 hours thereafter. During this
test, an internal 100k ? resistor is connected from BATT
to ground and the battery is monitored to ensure that
the battery voltage is above 2.6V. If the battery voltage
is below 2.6V, the BATTOK output deasserts low to indi-
cate a weak battery condition. The MAX16020 has a
BATT_TEST output that pulses high during the battery
voltage test. Connect a resistor and FET as shown in
Figure 6 to provide an additional load during the battery
test. In battery-backup mode, the battery testing function
is disabled and BATTOK goes low.
Battery Freshness Seal Mode
The MAX16016/MAX16020/MAX16021 battery fresh-
ness seal disconnects the backup battery from internal
circuitry and OUT until V CC is applied. This ensures the
backup battery connected to BATT is fresh when the
final product is used for the first time.
The internal freshness seal latch prevents BATT from
powering OUT until V CC has come up for the first time,
setting the latch. When V CC subsequently turns off,
BATT begins to power OUT.
t WD
WDI
WDO
Figure 1. Watchdog Timing (MAX16016/MAX16020)
t WD
t WD
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16021LTEZ+ | 功能描述:监控电路 uPwr w/Bat-Backup 2.323V 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 |
| MAX16021LTEZ+T | 功能描述:监控电路 uPwr w/Bat-Backup 2.323V 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 |
| MAX16021PTEL+ | 功能描述:监控电路 uPwr w/Bat-Backup 4.6894V 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 |
| MAX16021PTEL+T | 功能描述:监控电路 uPwr w/Bat-Backup 4.6894V 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 |
| MAX16021PTEM+ | 功能描述:监控电路 uPwr w/Bat-Backup 4.428V 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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