aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 48

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

ADuC7030/ADuC7033
16-BIT 6' ANALOG TO DIGITAL CONVERTERS
The ADuC7030/ADuC7033 incorporate two independent
sigma-delta ADCs namely, the current channel ADC (I-ADC)
and the voltage/temperature channel ADC (V/T-ADC). These
precision measurement channels integrate on-chip buffering,
programmable gain amplifier, 16-bit sigma-delta modulators,
and digital filtering and are intended for the precision
measurement of current, voltage, and temperature variables in
12 V automotive battery systems.
Current Channel ADC (I-ADC)
This ADC is intended to convert battery current sensed
through an external 100 μΩ shunt resistor. On-Chip
programmable gain mean the I-ADC can be configured to
accommodate battery current levels from ±1A to ±1500A
As shown in Figure 15, the I-ADC employs a sigma-delta
conversion technique to realize 16 bits of no missing codes
performance. The sigma-delta modulator converts the sampled
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input signal into a digital pulse train whose duty cycle contains
the digital information. A modified Sinc3 programmable low-
pass filter is then employed to decimate the modulator output
data stream to give a valid 16-bit data conversion result at
programmable output rates from 4 Hz to 8 kKHz in normal
mode and 1 Hz to 2 kHz in low power mode.
The I-ADC also incorporates counter, comparator and
accumulator logic. This allows the I-ADC result to generate an
interrupt after a predefined number of conversions have elapsed
or if the I-ADC result exceeds a programmable threshold value.
A fast ADC-Over-Range feature is also supported. Once
enabled, a 32-bit accumulator automatically sums the 16-bit I-
ADC results.
The time to a first valid (fully settled) result on the current
channel is three ADC conversion cycles with chop mode turned
off and two ADC conversion cycles with chop mode turned on.
Preliminary Technical Data