产品描述

在汽车微控制器应用中，看门狗用于监控微控制器的工作状态，以避免软件失控。
NSR37xxx-Q1 是看门狗 LDO 系列，设计用于高达 40V 的工作电压，轻负载下的典型静态电流仅为 15 μA。而且它具有低压差，在 300 mA 输出时仅为 230 mV。该系列有两种封装尺寸，对应两种输出电流版本：300mA 和 500mA。
该器件集成了可编程功能，可用于选择窗口或标准看门狗，看门狗时间可通过外部电阻器设置在10ms至500ms之间。NSR37xxx-Q1 还有一个 PG 引脚，用于指示输出电压何时稳定。PG延迟时间和触发阈值可由外部元件调节。该器件还具有集成短路和过流保护功能。
NSR37xxx-Q1的工作环境温度范围为 -40°C 至 +125°C，提供HTSSOP16, HTSSOP28封装，满足不同设计需求。

产品特性

• 满足 AEC-Q100 车规要求
• 工作环境温度：-40℃ ~ 125℃
• 工作电压范围：4V-40V，支持瞬态电压高达45V
• 输出电流范围：
• - NSR370xx：300mA
• - NSR371xx：500mA
• 超低静态功耗(Iq):
• - 0.7 μA (Typ) 当 EN = Low (关断模式)
• - 15 μA (Typ) 轻载模式下 (看门狗已禁用)
• 超低压差：230 mV at 300 mA
• 集成、可调窗口看门狗定时器，带独立标志
• 可选窗口或标准看门狗，具有可调周期：10 ms 至 500 ms
• 可编程阈值和复位脉冲延迟
• 集成故障保护：
• - 热关断
• - 短路保护

应用场景

• 汽车MCU电源
• 车身控制模块（BCM）
• 电子换挡杆
• 变速器控制单元（TCU）

Description

In automotive microcontroller applications, watchdogs are used to monitor the working status of microcontrollers, to avoid software runaway.
NSR37xxx-Q1 is a watchdog LDO series, designed for working voltages up to 40V, with a typical quiescent current of only 15 μA under light load. And it has a low dropout voltage, only 230 mV at 300 mA output. This series has two package sizes, corresponding to two output current versions: 300mA and 500mA.
The device integrates a programmable function, which can be used to select window or standard watchdog, and the watchdog time can be set between 10ms and 500ms by external resistors. NSR37xxx-Q1 also has a PG pin, which is used to indicate when the output voltage is stable. The PG delay time and trigger threshold can be adjusted by external components. The device also has integrated short circuit and overcurrent protection functions.
NSR37xxx-Q1 can operate at a temperature ranging from -40°C to +125°C, and is available in multiple packages such as HTSSOP16 HTSSOP28, meeting different design requirements.

Features

• AEC-Q100 qualified
• Operating temperature range: -40°C - 125°C
• Operating voltage range: 4V-40V, with transient voltage up to 45V
• Output current range:
• - 300mA for NSR370xx
• - 500mA for NSR371xx
• Low Quiescent Current (Iq):
• - 0.7 μA (Typ) When EN = Low (Shutdown Mode)
• - 15 μA (Typ) at Light Loads (Watchdog Disabled)
• Dropout Voltage: 230 mV at 300 mA
• Integrated, Adjustable Window Watchdog Timer with Independent Flag
• Selectable Window or Standard Watchdog, with Adjustable Period: 10 ms to 500 ms
• Programmable Threshold & Reset Pulse Delay
• Integrated Fault Protection
• - Thermal Shutdown
• - Short-Circuit Protection

Applications

• Automotive MCU Power Supply
• Body Control Modules (BCM)
• Electronic Gear Shifter
• Transmission Control Unit (TCU)

説明

In automotive microcontroller applications, watchdogs are used to monitor the working status of microcontrollers, to avoid software runaway.
NSR37xxx-Q1 is a watchdog LDO series, designed for working voltages up to 40V, with a typical quiescent current of only 15 μA under light load. And it has a low dropout voltage, only 230 mV at 300 mA output. This series has two package sizes, corresponding to two output current versions: 300mA and 500mA.
The device integrates a programmable function, which can be used to select window or standard watchdog, and the watchdog time can be set between 10ms and 500ms by external resistors. NSR37xxx-Q1 also has a PG pin, which is used to indicate when the output voltage is stable. The PG delay time and trigger threshold can be adjusted by external components. The device also has integrated short circuit and overcurrent protection functions.
NSR37xxx-Q1 can operate at a temperature ranging from -40°C to +125°C, and is available in multiple packages such as HTSSOP16 HTSSOP28, meeting different design requirements.

特徴

• AEC-Q100 qualified
• Operating temperature range: -40°C - 125°C
• Operating voltage range: 4V-40V, with transient voltage up to 45V
• Output current range:
• - 300mA for NSR370xx
• - 500mA for NSR371xx
• Low Quiescent Current (Iq):
• - 0.7 μA (Typ) When EN = Low (Shutdown Mode)
• - 15 μA (Typ) at Light Loads (Watchdog Disabled)
• Dropout Voltage: 230 mV at 300 mA
• Integrated, Adjustable Window Watchdog Timer with Independent Flag
• Selectable Window or Standard Watchdog, with Adjustable Period: 10 ms to 500 ms
• Programmable Threshold & Reset Pulse Delay
• Integrated Fault Protection
• - Thermal Shutdown
• - Short-Circuit Protection

アプリケーション

• Automotive MCU Power Supply
• Body Control Modules (BCM)
• Electronic Gear Shifter
• Transmission Control Unit (TCU)