Integrated, Precision Battery Sensor for

Automotive Systems

Data Sheet

ADuCM330/ADuCM331

Rev. C

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FEATURES

High precision analog-to-digital converters (ADCs)

Dual channel, simultaneous sampling

I-ADC 20-bit Σ-Δ (minimizes range switching)

VADC/TADC 20-bit Σ-Δ

Programmable ADC conversion rate from 1 Hz to 8 kHz

On-chip ±5 ppm/°C voltage reference

Current channel

Fully differential, buffered input

Programmable gain (from 4 to 512)

ADC absolute input range: −200 mV to +300 mV

Digital comparator with current accumulator feature

Voltage channel

Buffered, on-chip attenuator for 12 V battery input

Temperature channel

External and on-chip temperature sensor options

Microcontroller

ARM Cortex-M3 32-bit processor

16.384 MHz precision oscillator with 1% accuracy

Serial wire download (SWD) port supporting code

download and debug

Automotive qualified integrated local interconnect network

(LIN) transceiver

LIN 2.2-compatible slave, 100 kb fast download option

SAE J-2602-compatible slave

Low electromagnetic emissions (EME)

High electromagnetic immunity (EMI)

Memory

96 kB (ADuCM330)/128 kB (ADuCM331) Flash/EE memory, ECC

6 kB SRAM, ECC

4 kB data Flash/EE memory, ECC

10,000 cycle Flash/EE endurance

20 year Flash/EE retention

In circuit download via SWD and LIN

On-chip peripherals

Serial port interface (SPI)

General-purpose input/output (GPIO) port

General-purpose timer

Wake-up timer

Watchdog timer

On-chip, power-on reset

Power

Operates directly from 12 V battery supply

Power consumption, 8 mA typical (16 MHz)

Low power monitor mode

Package and temperature range

32-lead, 6 mm × 6 mm LFCSP

Fully specified for −40°C to +115°C operation; additional

specifications for 115°C to 125°C

Qualified for automotive applications

APPLICATIONS

Battery sensing/management for automotive and light

mobility vehicles

Lead acid battery measurement for power supplies in

industrial and medical domains

FUNCTIONAL BLOCK DIAGRAM

20-BIT

ADC

PGA

BUF

IIN+

IIN–

RESULT

ACCUMULATOR

DIGITAL

COMPARATOR

20-BIT

ADC

MUX

BUF

SWDIO

SWCLK

VBAT

VTEMP

GND_SW

PRECISION ANALOG ACQUISITION

CORTEX-M3

PROCESSOR

16MHz

PREC OSC 1%

LPM

1 × GP TIMER

WD TIMER

W/U TIMER

GPIO PORT

SPI PORT

LIN

LIN

LDO

POR

MEMORY

96kB (ADuCM330)/

128kB (ADuCM331)

FLASH,

6kB SRAM,

4kB DATA

RESET

TEMPERATURE

SENSOR

PRECISION

REFERENCE

ADuCM330/ADuCM331

Figure 1.