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型号： EVAL-ADUC7036QSPZ
厂商： Analog Devices Inc
文件页数： 72/132页
文件大小： 0K
描述： BOARD EVAL FOR ADUC7036
设计资源： EVAL-ADUC7036 Schematic & Brd Outline
EVAL ADUC7036 Gerber Files
标准包装： 1
系列： QuickStart™ PLUS 套件
主要目的： 电源管理，电池监控器
嵌入式： 是，MCU，16/32 位
已用 IC / 零件： ADuC7036
已供物品： 板，线缆，文档，仿真器，电源，软件
ADuC7036
Rev. C | Page 44 of 132
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: an external voltage, an external temperature
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
this is internally implemented in the voltage channel.
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 19.
ADC
RESULT
OUTPUT
FORMAT
CHOP
Σ- ADC
THE Σ-
ARCHITECTURE
ENSURES 16 BITS OF
NO MISSING CODES.
OUTPUT AVERAGE
AS PART OF THE CHOPPING
IMPLEMENTATION, EACH
DATA-WORD OUTPUT FROM
THE FILTER IS SUMMED AND
AVERAGED WITH ITS
PREDECESSOR.
Σ- MODULATOR
THE MODULATOR PROVIDES A
HIGH FREQUENCY, 1-BIT DATA
STREAM (THE OUTPUT OF
WHICH IS ALSO CHOPPED) TO
THE DIGITAL FILTER, THE DUTY
CYCLE OF WHICH REPRESENTS
THE SAMPLED ANALOG INPUT
VOLTAGE.
Σ- ADC
Σ-
MODULATOR
PROGRAMMABLE
DIGITAL FILTER
OUTPUT
AVERAGE
OFFSET
COEFFICIENT
GAIN
COEFFICIENT
ADC INTERRUPT GENERATOR
GENERATES AN ADC
INTERRUPT AFTER A VOLTAGE
OR TEMPERATURE
CONVERSION IS COMPLETED.
PRECISION REFERENCE
THE INTERNAL 5ppm/°C
REFERENCE IS ROUTED TO
THE ADC BY DEFAULT. AN
EXTERNAL REFERENCE ON
THE VREF PIN CAN ALSO
BE SELECTED.
BUF
INTERNAL
TEMPERATURE
BUF
CHOP
MUX
INTERNAL
REFERENCE
VREF
PROGRAMMABLE
DIGITAL FILTER
THE SINC3 FILTER REMOVES
QUANTIZATION NOISE INTRODUCED
BY THE MODULATOR. THE UPDATE
RATE AND BANDWIDTH OF THIS
FILTER ARE PROGRAMMABLE VIA
THE ADCFLT MMR.
OUTPUT SCALING
THE OUTPUT WORD FROM
THE DIGITAL FILTER IS
SCALED BY THE CALIBRATION
COEFFICIENTS BEFORE BEING
PROVIDED AS THE
CONVERSION RESULT.
VBAT
VTEMP
45
2
1
ADC
INTERRUPT
TO VOLTAGE OR
TEMPERATURE
DATA MMR
DIFFERENTIAL
ATTENUATOR
DIVIDE-BY-24 INPUT
ATTENUATOR
BUFFER AMPLIFIERS
THE BUFFER AMPLIFIERS
PRESENT A HIGH
IMPEDANCE INPUT STAGE
FOR THE ANALOG INPUT.
ANALOG INPUT
PROGRAMMABLE CHOPPING
THE INPUTS ARE
ALTERNATELY REVERSED
THROUGH THE CONVERSION
CYCLE.
07
47
4-
0
18
Figure 19. Voltage/Temperature ADC, Top-Level Overview
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