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| 型號(hào)： | EVAL-ADUC834QSZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 61/80頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV QUICK START ADUC834 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | ADuC834 |
| 所含物品： | 評(píng)估板，線纜，電源，軟件和文檔 |
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REV. A
–64–
ADuC834
Power Supplies
The ADuC834’s operational power supply voltage range is
2.7 V to 5.25 V. Although the guaranteed data sheet specifica-
tions are given only for power supplies within 2.7 V to 3.6 V or
5% of the nominal 5 V level, the chip will function equally well
at any power supply level between 2.7 V and 5.25 V.
Separate analog and digital power supply pins (AVDD and DVDD
respectively) allow AVDD to be kept relatively free of noisy digi-
tal signals often present on the system DVDD line. In this mode,
the part can also operate with split supplies; that is, using differ-
ent voltage supply levels for each supply. For example, this
means that the system can be designed to operate with a DVDD
voltage level of 3 V while the AVDD level can be at 5 V, or vice-
versa if required. A typical split supply configuration is shown in
Figure 61.
DVDD
48
34
20
ADuC834
5
6
AGND
AVDD
–
+
0.1 F
10 F
ANALOG SUPPLY
10 F
DGND
35
21
47
0.1 F
DIGITAL SUPPLY
–
+
Figure 61. External Dual Supply Connections
As an alternative to providing two separate power supplies,
AVDD can be kept quiet by placing a small series resistor and/or
ferrite bead between it and DVDD, and then decoupling AVDD
separately to ground. An example of this configuration is shown
in Figure 62. In this configuration, other analog circuitry (such
as op amps, voltage reference, and so on) can be powered from
the AVDD supply line as well.
DVDD
48
34
20
ADuC834
5
6
AGND
AVDD
0.1 F
10 F
DGND
35
21
47
0.1 F
–
+
DIGITAL SUPPLY
10 F
1.6
BEAD
Figure 62. External Single Supply Connections
Notice that in both Figure 61 and Figure 62 a large value (10 F)
reservoir capacitor sits on DVDD and a separate 10 F capacitor
sits on AVDD. Also, local decoupling capacitors (0.1 F) are
located at each VDD pin of the chip. As per standard design
practice, be sure to include all of these capacitors and ensure
the smaller capacitors are closest to each VDD pin with lead
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 noticed that, at all times, the analog
and digital ground pins on the ADuC834 should be referenced
to the same system ground reference point.
Power-On Reset Operation
An internal POR (Power-On Reset) is implemented on the
ADuC834. For DVDD below 2.45 V, the internal POR will hold
the ADuC834 in reset. As DVDD rises above 2.45 V, an internal
timer will time out for typically 128 ms before the part is
released from reset. The user must ensure that the power supply
has reached a stable 2.7 V minimum level by this time. Likewise
on power-down, the internal POR will hold the ADuC834 in
reset until the power supply has dropped below 1 V. Figure 63
illustrates the operation of the internal POR in detail.
128ms TYP
1.0V TYP
128ms TYP
2.45V TYP
1.0V TYP
INTERNAL
CORE RESET
DVDD
Figure 63. Internal Power-on-Reset Operation
Power Consumption
The DVDD power supply current consumption is specified in
normal, idle, and power-down modes. The AVDD power supply
current is specified with the analog peripherals disabled. The
normal mode power consumption represents the current drawn
from DVDD by the digital core. The other on-chip peripherals
(watchdog timer, power supply monitor, and so on) consume
negligible current and are therefore lumped in with the normal
operating current here. Of course, the user must add any cur-
rents sourced by the parallel and serial I/O pins, and those
sourced by the DAC in order to determine the total current
needed at the ADuC834’s DVDD and AVDD supply pins. Also,
current drawn from the DVDD supply will increase by approxi-
mately 5 mA during Flash/EE erase and program cycles.
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| EVAL-ADUC841QSPZ | 功能描述:KIT DEV QUICK START ADUC841 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 通用嵌入式開(kāi)發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁(yè)面:659 (CN2011-ZH PDF) |
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