aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 48
aduc7030
Manufacturer Part Number
aduc7030
Description
Integrated Precision Battery Sensor For Automotive
Manufacturer
Analog Devices, Inc.
Datasheet
1.ADUC7030.pdf
(150 pages)
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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
Rev. PrE | Page 48 of 150
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.
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