Features

 Voltage controlled current source (VCCS)

pump cell driver with selectable voltage clamp,

offset compensation, diagnostic (short to

battery) and 2 output channels

 Impedance measurement of reference cell

 10-bit multiplexed A/D converter

 Scaling amplifier with sample & hold and offset

compensation

 Control voltage amplifier with sample & hold

and offset compensation

 Synchronous or asynchronous functionality

selectable via SPI

 Heater FET driver with diagnostic (short to

battery, short to ground, open circuit)

 4 possible levels for clean current

 SPI with fault detection

 Digital input and outputs compatible with 5 V or

3.3 V voltage supply

 2 channels available to connect compensation

networks

 Short to battery diagnostic on functional ground

(pin SR)

 Short to battery/ground diagnostic on voltage

from reference cell (pin INRC)

 -5 V internal supply

 4 MHz internal oscillator

 Package: 48 pin LQFP

 Technology: BCD5s_70 V

Description

L9780 is an IC designed to interface a variety of wide range air fuel sensors.

The device manages the oxygen pump of the wide range air fuel sensor by means of a voltage controlled current source (VCCS). The reference for the VCCS is generated by a PI controller with external compensation network in order to adapt the device to different sensors. The user can choose between two different networks using the SPI interface. L9780 is fully compatible with most sensors on the market.

The internal timing state machine automatically manages all the operations needed for a right sequencing of the measurement process. All the main time values can be configured by SPI.

L9780 drives also an external FET used to control the sensor heater. The device protects the sensor and all the I/O against shorts and provides the diagnosis by SPI.

L9780属于集成电路（IC） > 电源管理 - 专用。意法半导体（ST）集团制造生产的L9780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。