L9945中文资料汽车级完全可配置8通道高/低侧MOSFET数据手册ST规格书

描述 Description

The L9945 is an 8-channel MOSFET pre-driver configurable for low-side, high-side, peak and hold and H-Bridge load control. It is designed to comply with the requirements of 12 V (passenger vehicle) and 24 V (commercial vehicle) battery systems.

All outputs can be PWM controlled. Six outputs are capable of driving safety relevant loads. One output can be dedicated to the actuation of safety relevant loads requiring a dedicated enable pin (EN6).

The device offers the possibility of controlling two independent H-Bridges.

The device can also drive up to two loads requiring \"peak & hold\" control strategy.

The driver outputs are protected against short circuit condition.

The device protects the external MOS in case of an overcurrent event.

Each output provides full diagnostic information such as short to battery, short to ground and open-load. Each output status can be constantly monitored through dedicated SPI registers.

The voltage slew rate of the external transistors 1-8 is controlled during turn ON and turn OFF in order to improve EMI behavior.

A double, redundant, external disable source is available through DIS and NDIS pins in order to improve safety.

The device is configurable via SPI through a 32-bit protocol.

特性 Features

• AEC-Q100 qualified
• 12 V and 24 V battery systems compliance
• 3.3 V and 5 V logic compatible I/O
• 8-channel configurable MOSFET pre-driver
•High-side (N-channel and P-channel MOS)
•Low-side (N-channel MOS)
•H-bridge (up to 2 H-bridge)
•Peak & Hold (2 loads)
• Operating battery supply voltage 3.8 V to 36 V
• Operating VDD supply voltage 4.5 V to 5.5 V
• All device pins, except the ground pins, withstand at least 40 V
• Programmable gate charge/discharge currents for improving EMI behavior
• Individual diagnosis for:
•Short circuit to battery
•Open load
•Short circuit to ground
• Highly flexible overcurrent sensing implementation
•Possibility of monitoring external MOS drain to source voltage
•Possibility of monitoring voltage on external shunt resistor
•64 programmable overcurrent thresholds independent for each channel
•Ultra-fast output shutdown in case of overcurrent
• Current limitation for H-Bridge configuration
• 32-bit SPI protocol available for configuration and diagnostics
•Failures latched even if they occur during diagnostics reading
•Daisy chain operation
•SDO protected against overvoltage
• Safety features
•Fast switch off redundant output disable through two external pins
•Built In Self Test (BIST) for logic operation
•Hardware Self Check (HWSC) for VDD5 overvoltage comparator
•Configurable Communication Check (CC) watchdog timer available
•Disable feedback through bi-directional pin
•Highly redundant output monitoring through dedicated SPI registers
• 10-bit ADC for battery and die temperature measurements available through SPI
• VDD5 monitoring for over/under voltage
• VPS (battery) monitoring for under voltage
• ISO26262 systems compatible

简介

L9945属于集成电路（IC）的电源管理-专用。由制造生产的L9945电源管理 - 专用专用型电源管理集成电路 (PMIC) 用于电源的控制或操作，适合特定或小范围的目标应用，例如汽车气囊管理、电容器组平衡、AC 公共电力监控、存储器总线端接、接地故障检测、能量收集、小型引擎管理、处理器或芯片集专用电压调节、负载突降保护、触觉驱动器、热电制冷器控制等。