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參數(shù)資料
| 型號： | ADUuC7027BSTZ62-RL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU |
| 中文描述： | 精密模擬微控制器的12位模擬I / O，ARM7TDMI的微控制器 |
| 文件頁數(shù)： | 85/92頁 |
| 文件大小： | 850K |
| 代理商： | ADUUC7027BSTZ62-RL |
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ADuC7019/20/21/22/24/25/26/27
POWER-ON RESET OPERATION
An internal power-on reset (POR) is implemented on the
ADuC7019/7020/7021/7022/7024/7025/7026/7027. For LV
DD
below 2.35 V typical, the internal POR holds the part in reset.
As LV
DD
rises above 2.35 V, an internal timer times out for
typically 128 ms before the part is released from reset. The user
must ensure that the power supply IOV
DD
has reached a stable
2.7 V minimum level by this time. Likewise, on power-down,
the internal POR holds the ADuC7019/7020/7021/7022/
7024/7025/7026/7027 in reset until LV
DD
has dropped below
2.35 V.
Rev. A | Page 85 of 92
Figure 79 illustrates the operation of the internal POR in detail.
0
IOV
DD
3.3V
2.6V
2.35V TYP
2.35V TYP
128ms TYP
LV
DD
POR
MRST
0.12ms TYP
Figure 79. ADuC7019/7020/7021/7022/7024/7025/7026/7027
Internal Power-on Reset Operation
TYPICAL SYSTEM CONFIGURATION
A typical ADuC7020 configuration is shown in Figure 80. It summarizes some of the hardware considerations discussed in the previous
sections. The bottom of the CSP package has an exposed pad that needs to be soldered to a metal plate on the board for mechanical
reasons. The metal plate of the board can be connected to ground.
NOT CONNECTED IN THIS EXAMPLE
30
29
28
27
26
25
XCLKI
24
XCLKO
23
22
21
1
2
3
GND
REF
DAC0
4
5
6
7
8
TMS
9
TDI
10
P0.0
40
39
38
A
37
A
D
36
A
35
V
R
34
33
P
32
P
31
11
12
13
T
T
14
I
15
I
D
16
L
D
D
17
18
T
19
R
20
DV
DD
1k
Ω
10
Ω
ADuC7020
0.01
μ
F
+
–
AV
DD
0.47
μ
F
TDO
TCK
TMS
TDI
TRST
J
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DV
DD
DV
DD
1
Ω
1
Ω
1
Ω
DV
DD
DV
DD
32.768kHz
0.47
μ
F
1k
Ω
0.1
μ
F
10
μ
F
10
μ
F
1.5
Ω
270
Ω
DV
DD
AV
DD
ADP3333-3.3
OUT
IN
SD
GND
1
C1+
2
V+
3
C1–
4
C2+
5
C2–
6
V–
7
T2OUT
8
R2IN
ADM3202
RS232 INTERFACE*
*EXTERNAL UART TRANSCEIVER INTEGRATED IN SYSTEM OR AS
PART OF AN EXTERNAL DONGLE AS DESCRIBED IN uC006.
STANDARD D-TYPE
SERIAL COMMS
CONNECTOR TO
PC HOST
16
V
CC
GND
15
14
T1OUT
13
R1IN
12
R1OUT
11
T1IN
10
T2IN
9
R2OUT
1
2
3
4
5
6
7
8
9
0
Figure 80. Typical System Configuration
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