ADUC7032-8L Integrated Precision Battery Sensor for Automotive System

The ADuC7032-8L is a complete system solution for battery monitoring in 12 V automotive applications. The device integrates 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. Battery sensing/management for automotive systems

Minimizing external system components, the device is powered directly from the 12 V battery. An on-chip, low dropout (LDO) regulator generates the supply voltage for the three integrated 16-bit ADCs. The ADCs precisely measure battery current, voltage, and temperature, which can be used to characterize the state of health and charge of a car battery.

A Flash/EE memory-based ARM7™ microcontroller (MCU) is also integrated on-chip and is used both to preprocess the acquired battery variables and to manage communications from the ADuC7032-8L to the main electronic control unit (ECU) via a local interconnect network (LIN) interface, which 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.

In its normal operating mode, the MCU is clocked indirectly from an on-chip oscillator via the phase-locked loop (PLL) at a maximum clock rate of 20.48 MHz. In its power-saving operating modes, the MCU can be totally powered down, waking up only in response to an ADC conversion result ready, digital comparators, the wake-up timer, a power-on reset (POR), or an external serial communication event.

The ADC can be configured to operate in a normal (full-power) mode of operation, interrupting the MCU after various sample conversion events. The current channel features two low power modes: low power and low power plus, generating conversion results to a lower performance specification.

On-chip factory firmware supports in-circuit Flash/EE memory reprogramming via the LIN or JTAG serial interface ports, and nonintrusive emulation is also supported via the JTAG interface. These features are incorporated into a low cost QuickStart™ Plus development system supporting the ADuC7032-8L.

The ADuC7032-8L operates directly from the 12 V battery supply and is fully specified over a temperature range of −40°C to +105°C. The ADuC7032-8L is functional, with degraded performance, at temperatures from 105°C to 125°C.

Features and Benefits

Operates directly from 12 V battery supply
Current consumption
- Normal mode: 10 mA at 10 MHz
- Low power monitor mode: 175 µA
Dual channel, simultaneous sampling, 16-bit Σ-Δ ADCs
Third independent ADC for temperature sensing
Programmable ADC throughput from 1 Hz to 8 kHz
On-chip 5 ppm/°C voltage reference
Current channel
Fully differential, buffered input
Programmable gain: 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
96 kB Flash/EE memory, 6 kB SRAM
10k-cycle Flash/EE endurance, 20-year Flash/EE retention
In-circuit download via JTAG and LIN
64 × 16-bit result FIFO for current and voltage ADC
Package and temperature range
48-lead, 7 mm × 7 mm LQFP
Fully specified for −40°C to +105°C operation

ARM7TDMI core, 16-/32-bit RISC architecture
20.48 MHz PLL with programmable divider
PLL input source
On-chip precision oscillator
On-chip low power oscillator
External (32.768 kHz) watch crystal
JTAG port supports code download and debug
LIN 1.3- and 2.0-compatible (slave) support via UART with hardware synchronization
Flexible wake-up I/O pin, master/slave SPI serial I/O
9-pin GPIO port, 2× general-purpose timers
Wake-up and watchdog timers
Power supply monitor, on-chip power-on reset

Processors & DSP

ARM7 Core Products

Data Sheets

Document	note
ADuC7032-8L: Integrated Precision Battery Sensor for Automotive System Data Sheet (Rev. A) ADuC7032-8L: Silicon Anomaly List (Rev B, 5/2010)	PDF 128 kB