參數(shù)資料
型號: ADUC7036DCPZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 73/132頁
文件大?。?/td> 0K
描述: IC MCU 96K FLASH DUAL 48LFCSP
標(biāo)準(zhǔn)包裝: 2,500
系列: MicroConverter® ADuC7xxx
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 20.48MHz
連通性: LIN,SPI,UART/USART
外圍設(shè)備: PSM,溫度傳感器,WDT
輸入/輸出數(shù): 9
程序存儲器容量: 96KB(48K x 16)
程序存儲器類型: 閃存
RAM 容量: 1.5K x 32
電壓 - 電源 (Vcc/Vdd): 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 2x16b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 115°C
封裝/外殼: 48-VFQFN 裸露焊盤,CSP
包裝: 帶卷 (TR)
ADuC7036
Rev. C | Page 45 of 132
ADC GROUND SWITCH
The ADuC7036 features an integrated ground switch pin,
GND_SW (Pin 15). This switch allows the user to dynamically
disconnect ground from external devices and, instead, use either
a direct connection to ground or a connection to ground using
a 20 kΩ resistor. This additional resistor can be used to reduce
the number of external components required for an NTC circuit.
The ground switch feature can be used for reducing power
consumption on application-specific boards.
An example application is shown in Figure 20.
RREF
REG_AVDD
VTEMP
NTC
20k
REG_AVDD
VTEMP
GND_SW
NTC
07
47
4-
019
Figure 20. Example External Temperature Sensor Circuits
Figure 20 shows an external NTC used in two modes, with one
using the internal 20 kΩ resistor and the second showing a direct
connection to ground via GND_SW.
ADCCFG[7] controls the connection of the ground switch to
ground, and ADCMDE[6] controls GND_SW resistance, as
shown in Figure 21.
20k
GND_SW
ADCMDE[6]
ADCCFG[7]
07
47
4-
020
Figure 21. Internal Ground Switch Configuration
The possible combinations of ADCCFG[7] and ADCMDE[6]
are shown in Table 31.
Table 31. GND_SW Configuration
ADCCFG[7]
ADCMDE[6]
GND_SW
0
Floating
0
1
Floating
1
0
Direct connection to ground
1
Connected to ground via 20 kΩ
resistor
ADC NOISE PERFORMANCE TABLES
Table 32, Table 33, and Table 34 list the output rms noise in
microvolts for some typical output update rates on the I-ADC
and V-/T-ADC. The numbers are typical and are generated at
a differential input voltage of 0 V. The output rms noise is specified
as the standard deviation (or 1 Σ) of the distribution of ADC
output codes collected when the ADC input voltage is at a dc
voltage. It is expressed in microvolts rms (μV rms).
Table 32. Typical Output RMS Noise of Current Channel ADC in Normal Power Mode
ADC Input Range
ADCFLT
Data
Update
Rate
±2.3 mV
(512)
±4.6 mV
(256)
±4.68 mV
(128)
±18.75 mV
(64)
±37.5 mV
(32)
±75 mV
(16)
±150 mV
(8)
±300 mV
±600 mV
±1.2 V
0xBF1D
4 Hz
0.040
μV
0.040
μV
0.043
μV
0.045
μV
0.087
μV
0.175
μV
0.35
μV
0.7
μV
1.4
μV
2.8
μV
0x961F
10 Hz
0.060
μV
0.060
μV
0.060
μV
0.065
μV
0.087
μV
0.175
μV
0.35
μV
0.7
μV
1.4
μV
2.8
μV
0x007F
50 Hz
0.142
μV
0.142
μV
0.144
μV
0.145
μV
0.170
μV
0.305
μV
0.380
μV
0.7
μV
2.3
μV
2.8
μV
0x0007
1 kHz
0.620
μV
0.620
μV
0.625
μV
0.625
μV
0.770
μV
1.310
μV
1.650
μV
2.520
μV
7.600
μV
7.600
μV
0x0000
8 kHz
2.000
μV
2.000
μV
2.000
μV
2.000
μV
2.650
μV
4.960
μV
8.020
μV
15.0
μV
55.0
μV
55.0
μV
1 The maximum absolute input voltage allowed is 200 mV to +300 mV, relative to ground.
Table 33. Typical Output RMS Noise (Referred to ADC Voltage Attenuator Input) of Voltage Channel ADC
ADCFLT
Data Update Rate
28.8 V ADC Input Range
0xBF1D
4 Hz
65 μV
0x961F
10 Hz
65 μV
0x0007
1 kHz
180 μV
0x0000
8 kHz
1600 μV
Table 34. Typical Output RMS Noise of Temperature Channel ADC
ADCFLT
Data Update Rate
0 V to 1.2 V ADC Input Range
0xBF1D
4 Hz
2.8 μV
0x961F
10 Hz
2.8 μV
0x0007
1 kHz
7.5 μV
0x0000
8 kHz
55 μV
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