ST L9952GXP 汽車電源管理方案

ST 公司的L9952GXP是具有先進的接觸監視和外設功能而又包含了兩個低壓降穩壓器的功率管理集成電路,采用標準的24位SPI來控制工作模式,并提供診斷功能. L9952GXP具有視窗看門狗和自動防故障輸出以及中斷輸出,LIN 2.1兼容的收發器. L9952GXP還集成了5個高邊驅動器,2個繼電器驅動器,并具有短路保護功能以及溫度告警和熱關斷特性.此外還集成了用于地線電流檢測的2個運放. L9952GXP主要用在汽車ECU如門區和車體控制模塊.本文介紹了L9952GXP主要特性,方框圖和標準系統配置圖以及車門模塊分割方框圖.

The L9952GXP is a power management system IC containing two low drop regulators with advanced contact monitoring and additional peripheral functions.

The integrated standard serial peripheral interface (SPI) controls all L9952GXP operation modes and provides driver diagnostic functions.

L9952GXP主要特性:

■ Two 5V low-drop voltage regulators (250mA, 100mA continuous mode)

■ Low stand-by current: VBAT stby, 7μA; ,V1 stby, 45μA, (75μA in cycl. sense)

■ Window watchdog and fail-safe output

■ Interrupt output

■ Wake-up logic with cyclic contact monitoring

■ LIN 2.1 compliant (SAEJ2602 compatible) transceiver

■ 24 bit SPI interface for mode control and diagnostic

■ Output drivers

■ 4 High side drivers for e.g. LED or HALL (RDSon,typ = 7.)

■ 1 High side driver Out_HS ( RDSon,typ = 1.)

■ 2 Relay drivers ( RDSon,typ = 2.)

■ Outputs are short circuit protected

■ 2 Op amps for current sensing in GND return lines

■ Temperature warning and thermal shutdown

L9952GXP應用:

■ Automotive ECU’ s such as door zone and body control modules.

圖1.L9952GXP方框圖(1)

圖2.L9952GXP內部方框圖(2)

圖3.L9952GXP標準系統配置圖

圖4.L9952GXP車門模塊分割方框圖