Integrated Precision Battery Sensor for Automotive

The ADuC7036 is a complete system solution for battery monitoring in 12 V automotive applications. These devices integrate all of the required features to precisely and intelligently monitor, process, and diagnose 12 V battery parameters including battery current, voltage, and temperature, over a wide range of operating conditions.

Minimizing external system components, the device is powered directly from the 12 V battery. An on-chip, low dropout regulator generates the supply voltage for two integrated, 16-bit, Σ-Δ ADCs. The ADCs precisely measure battery current, voltage, and temperature to characterize the state of the health and charge of the car battery.

A Flash/EE memory-based ARM7™ microcontroller (MCU) is also integrated on chip. It is used to both preprocess the acquired battery variables and to manage communications from the ADuC7036 to the main electronic control unit (ECU) via a local interconnect network (LIN) interface that is integrated on chip.

Both the MCU and the ADC subsystem can be individually configured to operate in normal or flexible power saving modes of operation.

Applications

* Battery sensing/management for automotive systems

* Dual channel, simultaneous sampling, 16-bit, Σ-Δ ADCs

* Programmable ADC throughput from 1 Hz to 8 kHz

* On-chip 5 ppm/°C voltage reference

* Current channel

Fully differential, buffered input

Programmable gain from 1 to 512

ADC input range: −200 mV to +300 mV

Digital comparators, with current accumulator feature

* Voltage channel

Buffered, on-chip attenuator for 12 V battery inputs

* Temperature channel

External and on-chip temperature sensor options