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參數資料
| 型號： | ADUC845 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| 中文描述： | MicroConverter的多通道ADC的24-/16-Bit與嵌入式62 kB閃存以及單周期控制器 |
| 文件頁數： | 87/108頁 |
| 文件大小： | 1109K |
| 代理商： | ADUC845 |
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ADuC845/ADuC847/ADuC848
HARDWARE DESIGN CONSIDERATIONS
This section outlines some of the key hardware design
considerations that must be addressed when integrating the
ADuC845/ADuC847/ADuC848 into any hardware system.
Rev. A | Page 87 of 108
EXTERNAL MEMORY INTERFACE
In addition to their internal program and data memories, the
parts can access up to 16 Mbytes of external data memory
(SRAM). No external program memory access is available.
To begin executing code, tie the EA (external access) pin high.
When EA is high (pulled up to V
DD
—see Figure 69), user
program execution starts at Address 0 in the internal 62-kbyte
Flash/EE code space. When executing from internal code space,
accesses to the program space above F7FFH (62 kbytes) are read
as NOP instructions.
Note that a second very important function of the EA pin is
described in the Single-Pin Emulation Mode section under the
Other Hardware Considerations section.
Figure 62 shows a hardware configuration for accessing up to
64 kbytes of external data memory. This interface is standard to
any 8051 compatible MCU.
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
ADuC845/
ADuC847/
ADuC848
RD
P2
ALE
P0
WE
WR
0
Figure 62. External Data Memory Interface (64-kbyte Address Space)
If access to more than 64 kbytes of RAM is desired, a feature
unique to the MicroConverter allows addressing up to 16 Mbytes
of external RAM simply by adding another latch as shown in
Figure 63.
LATCH
P2
ALE
P0
LATCH
SRAM
A8–A15
A0–A7
D0–D7
A16–A23
OE
RD
WE
WR
ADuC845/
ADuC847/
ADuC848
0
Figure 63. External Data Memory Interface (16-Mbtye Address Space)
In either implementation, Port 0 (P0) serves as a multiplexed
address/data bus. It emits the low byte of the data pointer (DPL)
as an address, which is latched by ALE prior to data being placed
on the bus by the parts (write operation) or the external data
memory (read operation). Port 2 (P2) provides the data pointer
page byte (DPP) to be latched by ALE, followed by the data
pointer high byte (DPH). If no latch is connected to P2, DPP is
ignored by the SRAM, and the 8051 standard of 64-kbyte external
data memory access is maintained.
The following example shows the code used to write data to
external data memory.
MOV DPP, #10h ;Set addr to 100000h
MOV DPH, #00h
MOV DPL, #00h
MOV A, #'B' ;Write Char ‘B’ (42h)
MOVX @DPTR,A ;Move to DPP:DPH:DPL addr
POWER SUPPLIES
The parts’ operational power supply voltage range is 2.7 V to
5.25 V. Although the guaranteed data sheet specifications are
given only for power supplies within 2.7 V to 3.6 V and 4.75 V
to 5.25 V (±5% of the nominal 5 V level), the chip functions
equally well at any power supply level between 2.7 V and 5.25 V.
Separate analog and digital power supply pins (AV
DD
and DV
DD
,
respectively) allow AV
DD
to be kept relatively free of the noisy
digital signals often present on a system DV
DD
line. In this mode,
the part can also operate with split supplies, that is, using different
voltage supply levels for each supply. For example, the system
can be designed to operate with a DV
DD
voltage level of 3 V and
the AV
DD
level can be at 5 V, or vice versa, if required. A typical
split-supply configuration is shown in Figure 64.
DIGITAL SUPPLY
ANALOG SUPPLY
DV
DD
AGND
AV
DD
DGND
–
+
–
+
0.1
μ
F
0.1
μ
F
10
μ
F
10
μ
F
ADuC845/
ADuC847/
ADuC848
0
6
5
4
22
36
51
50
38
37
23
Figure 64. External Dual-Supply Connections
(56-Lead CSP Pin Numbering)
相關PDF資料 |
PDF描述 |
|---|---|
| ADUC845BCP8-3 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC847BCP8-3 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC845BCP8-5 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADUC845_12 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter?? Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC845BCP32-3 | 制造商:Analog Devices 功能描述:10 CHANNEL 24 BIT DUAL ADC + FAST 8BIT UP - Trays |
| ADUC845BCP32-5 | 制造商:Analog Devices 功能描述:10 CHANNEL 24 BIT DUAL ADC + FAST 8BIT UP - Trays |
| ADUC845BCP62-3 | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 56-Pin LFCSP EP |
| ADUC845BCP62-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
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