ADUC7034BCPZ-RL Analog Devices Inc, ADUC7034BCPZ-RL Datasheet - Page 42

• Manufacturer Part Number: ADUC7034BCPZ-RL
• Description: IC,Battery Management,LLCC,48PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC7xxxr

Specifications of ADUC7034BCPZ-RL

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 20.48MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: POR, PSM, Temp Sensor, WDT
• Number Of I /o: 9
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 18 V
• Data Converters: A/D 2x16b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 115°C
• Package / Case: 48-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADuC7034
VOLTAGE/TEMPERATURE CHANNEL ADC (V-/T-ADC)
The voltage/temperature channel ADC (V-/T-ADC) converts
additional battery parameters, such as voltage and temperature.
The input to this channel can be multiplexed from one of three
input sources, namely, an external voltage, an external tempera-
ture sensor circuit, or an on-chip temperature sensor.
As with the current channel ADC (I-ADC), the V-/T-ADC
employs an identical Σ-Δ conversion technique, including a
modified sinc3 low-pass filter to provide a valid 16-bit data
conversion result at programmable output rates from 4 Hz to
8 kHz. An external RC filter network is not required because it
is internally implemented in the voltage channel.
*R = 70kΩ
VTEMP
VBAT
DIVIDE-BY-24 INPUT
DIFFERENTIAL
ATTENUATOR
ATTENUATOR
45R*
2R*
1R*
BUF
BUF
INTERNAL
TEMP
IMPEDANCE INPUT STAGE
THE BUFFER AMPLIFIERS
FOR THE ANALOG INPUT.
BUFFER AMPLIFIERS
PRESENT A HIGH
REFERENCE IS ROUTED TO
EXTERNAL REFERENCE ON
THE ADC BY DEFAULT. AN
THE VREF PIN CAN ALSO
PRECISION REFERENCE
THE INTERNAL 5ppm/°C
MUX
BE SELECTED.
CHOP
Figure 18. Voltage/Temperature ADC, Top-Level Overview
REFERENCE
PROGRAMMABLE CHOPPING
THROUGH THE CONVERSION
INTERNAL
ALTERNATELY REVERSED
VREF
MODULATOR
THE INPUTS ARE
ANALOG INPUT
Σ-Δ
CYCLE.
Rev. B | Page 42 of 136
Σ-Δ ADC
PROGRAMMABLE
QUANTIZATION NOISE INTRODUCED
DIGITAL FILTER
BY THE MODULATOR. THE UPDATE
FILTER ARE PROGRAMMABLE VIA
RATE AND BANDWIDTH OF THIS
SCALED BY THE CALIBRATION
COEFFICIENTS BEFORE BEING
THE SINC3 FILTER REMOVES
THE OUTPUT WORD FROM
THE DIGITAL FILTER IS
CONVERSION RESULT.
PROVIDED AS THE
THE ADCFLT MMR.
OUTPUT SCALING
PROGRAMMABLE
CYCLE OF WHICH REPRESENTS
THE DIGITAL FILTER, THE DUTY
THE MODULATOR PROVIDES A
HIGH FREQUENCY, 1-BIT DATA
THE SAMPLED ANALOG INPUT
DIGITAL FILTER
WHICH IS ALSO CHOPPED) TO
STREAM (THE OUTPUT OF
The external battery voltage (VBAT) is routed to the ADC input
via an on-chip high voltage (divide-by-24) resistive attenuator.
The voltage attenuator buffers are automatically enabled when
the voltage attenuator input is selected.
The battery temperature can be derived through the on-chip
temperature sensor or an external temperature sensor input.
The time to a first valid (fully settled) result after an input
channel switch on the voltage/temperature channel is three
ADC conversion cycles with chop mode disabled.
This ADC is again buffered but, unlike the current channel,
has a fixed input range of 0 V to VREF on VTEMP and 0 V to
28.8 V on VBAT (assuming an internal 1.2 V reference). A top-
level overview of this ADC signal chain is shown in Figure 18.
Σ-Δ MODULATOR
VOLTAGE.
COEFFICIENT
COEFFICIENT
OFFSET
GAIN
CHOP
INTERRUPT AFTER A VOLTAGE
ADC INTERRUPT GENERATOR
CONVERSION IS COMPLETED.
AVERAGE
FORMAT
OUTPUT
RESULT
OUTPUT
NO MISSING CODES.
ADC
GENERATES AN ADC
ENSURES 16 BITS
ARCHITECTURE
OR TEMPERATURE
Σ-Δ ADC
THE Σ-Δ
INTERRUPT
TO VOLTAGE OR
TEMPERATURE
DATA MMR
ADC
THE FILTER IS SUMMED AND
AS PART OF THE CHOPPING
DATA-WORD OUTPUT FROM
IMPLEMENTATION, EACH
AVERAGED WITH ITS
OUTPUT AVERAGE
PREDECESSOR.