参数资料
型号: ADUC834BSZ
厂商: Analog Devices Inc
文件页数: 65/80页
文件大小: 0K
描述: IC ADC DUAL16/24BIT W/MCU 52MQFP
产品培训模块: Process Control
标准包装: 1
系列: MicroConverter® ADuC8xx
核心处理器: 8052
芯体尺寸: 8-位
速度: 12.58MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: POR,PSM,PWM,温度传感器,WDT
输入/输出数: 34
程序存储器容量: 62KB(62K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 2.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.25 V
数据转换器: A/D 3x16b,4x24b; D/A 1x12b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 52-QFP
包装: 托盘
产品目录页面: 738 (CN2011-ZH PDF)
REV. A
–68–
ADuC834
Typical System Configuration
A typical ADuC834 configuration is shown in Figure 66. It
summarizes some of the hardware considerations discussed in
the previous paragraphs.
Figure 66 also includes connections for a typical analog measure-
ment application of the ADuC834, namely an interface to an
RTD (Resistive Temperature Device). The arrangement shown
is commonly referred to as a 4-wire RTD configuration.
Here, the on-chip excitation current sources are enabled to excite
the sensor. The excitation current flows directly through the
RTD generating a voltage across the RTD proportional to its
resistance. This differential voltage is routed directly to the positive
and negative inputs of the primary ADC (AIN1, AIN2 respec-
tively). The same current that excited the RTD also flows through
a series resistance RREF generating a ratiometric voltage reference
VREF. The ratiometric voltage reference ensures that variations
in the excitation current do not affect the measurement system as
the input voltage from the RTD and reference voltage across
RREF vary ratiometrically with the excitation current. Resistor
RREF must, however, have a low temperature coefficient to avoid
errors in the reference voltage over temperature. RREF must
also be large enough to generate at least a 1 V voltage reference.
C1+
V+
C1–
C2+
C2–
V–
T2OUT
R2IN
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
ADM3202
DVDD
27
34
33
31
30
29
28
39
38
37
36
35
32
40
47
46
44
43
42
41
52
51
50
49
48
45
DVDD
1k
DVDD
1k
2-PIN HEADER FOR
EMULATION ACCESS
(NORMALLY OPEN)
DOWNLOAD/DEBUG
ENABLE JUMPER
(NORMALLY OPEN)
32.768kHz
DVDD
1
2
3
4
5
6
7
8
9
AVDD
200 A/400 A
EXCITATION
CURRENT
RTD
RREF
5.6k
AVDD
AGND
P1.2/IEXC1/DAC
REFIN–
REFIN+
P1.4/AIN1
P1.5/AIN2
DV
DD
DGND
PSEN
EA
DGND
DVDD
XTAL2
XTAL1
RESET
RXD
TXD
DV
DD
DGND
NOT CONNECTED IN THIS EXAMPLE
ADuC834
P1.3/AIN5/DAC
DVDD
RS-232 INTERFACE*
STANDARD D-TYPE
SERIAL COMMS
CONNECTOR TO
PC HOST
*EXTERNAL UART TRANSCEIVER INTEGRATED IN SYSTEM OR AS
PART OF AN EXTERNAL DONGLE AS DESCRIBED IN uC006.
ALL CAPACITORS IN THIS EXAMPLE ARE
0.1 F CERAMIC CAPACITORS
Figure 66. Typical System Configuration
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