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參數(shù)資料
| 型號(hào)： | ADUC832 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU |
| 中文描述： | MicroConverter的，12位ADC和62 kBytes為嵌入式閃存MCU數(shù)模轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 63/80頁(yè) |
| 文件大?。?/td> | 1311K |
| 代理商： | ADUC832 |
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REV. 0
ADuC832
–63–
Separate analog and digital power supply pins (AV
DD
and DV
DD
,
respectively) allow AV
DD
to be kept relatively free of noisy digital
signals often present on the system DV
DD
line. However, though
you can power AV
DD
and DV
DD
from two separate supplies if
desired, you must ensure that they remain within
±
0.3 V of one
another at all times in order to avoid damaging the chip (as per
the Absolute Maximum Ratings section). Therefore, it is recom-
mended that unless AV
DD
and DV
DD
are connected directly
together, you connect back-to-back Schottky diodes between
them as shown in Figure 60.
DV
DD
ADuC832
AGND
AV
DD
0.1 F
10 F
ANALOG SUPPLY
10 F
DGND
0.1 F
DIGITAL SUPPLY
–
+
–
+
Figure 60. External Dual-Supply Connections
As an alternative to providing two separate power supplies, the
user can help keep AV
DD
quiet by placing a small series resistor
and/or ferrite bead between it and DV
DD
, and then decoupling
AV
DD
separately to ground. An example of this configuration is
shown in Figure 61. With this configuration other analog circuitry
(such as op amps, voltage reference, and so on) can be powered
from the AV
DD
supply line as well. The user will still want to
include back-to-back Schottky diodes between AV
DD
and DV
DD
in
order to protect from power-up and power-down transient condi-
tions that could separate the two supply voltages momentarily.
DV
DD
ADuC832
AGND
0.1 F
10 F
DGND
0.1 F
–
+
DIGITAL SUPPLY
10 F
1.6
BEAD
AV
DD
Figure 61. External Single-Supply Connections
Notice that in both Figure 60 and Figure 61, a large value (10
m
F)
reservoir capacitor sits on DV
DD
and a separate 10
m
F capacitor
sits on AV
DD
. Also, local small-value (0.1
m
F) capacitors are
located at each V
DD
pin of the chip. As per standard design prac-
tice, be sure to include all of these capacitors, and ensure the
smaller capacitors are close to each AV
DD
pin with trace lengths
as short as possible. Connect the ground terminal of each of
these capacitors directly to the underlying ground plane. Finally,
it should also be noted that, at all times, the analog and digital
ground pins on the ADuC832 must be referenced to the same
system ground reference point.
Power Consumption
The currents consumed by the various sections of the ADuC832
are shown in Table XXXIV. The Core values given represent the
current drawn by DV
DD
, while the rest (ADC, DAC, voltage ref)
are pulled by the AV
DD
pin and can be disabled in software
when not in use. The other on-chip peripherals (watchdog timer,
power supply monitor, and so on) consume negligible current
and are therefore lumped in with the Core operating current here.
Of course, the user must add any currents sourced by the parallel
and serial I/O pins, and sourced by the DAC, in order to deter-
mine the total current needed at the ADuC832
’
s supply pins.
Also, current drawn from the DV
DD
supply will increase by
approximately 10 mA during Flash/EE erase and program cycles.
Table XXXIV. Typical I
DD
of Core and Peripherals
V
DD
= 5 V
V
DD
= 3 V
Core:
(Normal Mode) (1.6 nAs M
CLK
) +
6 mA
Core:
(Idle Mode)
(0.75 nAs M
CLK
) +
5 mA
ADC:
1.3 mA
DAC (Each):
250
m
A
Voltage Ref:
200
m
A
(0.8 nAs M
CLK
) +
3 mA
(0.25 nAs
M
CLK
) +
3 mA
1.0 mA
200
m
A
150
m
A
Since operating DV
DD
current is primarily a function of clock
speed, the expressions for Core supply current in Table XXXIV
are given as functions of M
CLK
, the core clock frequency. Plug in
a value for M
CLK
in hertz to determine the current consumed by
the core at that oscillator frequency. Since the ADC and DACs
can be enabled or disabled in software, add only the currents
from the peripherals you expect to use. And again, do not forget
to include current sourced by I/O pins, serial port pins, DAC
outputs, and so forth, plus the additional current drawn during
Flash/EE erase and program cycles.
A software switch allows the chip to be switched from normal
mode into idle mode, and also into full power-down mode.
Below are brief descriptions of power-down and idle modes.
Power Saving Modes
In idle mode, the oscillator continues to run but the core clock
generated from the PLL is halted. The on-chip peripherals
continue to receive the clock, and remain functional. The CPU
status is preserved with the stack pointer and program counter,
and all other internal registers maintain their data during idle
mode. Port pins and DAC output pins retain their states in this
mode. The chip will recover from idle mode upon receiving any
enabled interrupt, or upon receiving a hardware reset.
In full power-down mode, both the PLL and the clock to the core
are stopped. The on-chip oscillator can be halted or can continue
to oscillate depending on the state of the oscillator power-down
bit in the PLLCON SFR. The TIC, being driven directly from
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC832BCP | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V/5V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 16.78MHZ 3.3/5V 56LFCSP - Bulk |
| ADUC832BCP-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V/5V 56-Pin LFCSP EP T/R |
| ADUC832BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:96KB（96K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| ADUC832BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:4KB（4K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
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