MCP3221" />
參數(shù)資料
型號(hào)： MCP3221DM-PCTL
廠商： Microchip Technology
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 0K
描述： BOARD DEMO FOR PICTAIL MCP3221
標(biāo)準(zhǔn)包裝： 1
系列： PICtail™
ADC 的數(shù)量： 1
位數(shù)： 12
采樣率（每秒）： 22.3k
數(shù)據(jù)接口： 串行
工作溫度： -40°C ~ 85°C
已用 IC / 零件： MCP3221
已供物品： 板，纜線，CD
2006 Microchip Technology Inc.
DS21732C-page 19
MCP3221
6.3
Device Polling
In some instances, it may be necessary to test for
MCP3221 presence on the I2C bus without performing
a conversion. This operation is described in Figure 6-4.
Here we are setting the R/W bit in the address byte to
a zero. The MCP3221 will then acknowledge by pulling
SDA low during the ACK clock and then release the
bus back to the I2C master. A stop or repeated start bit
can then be issued from the master and I2C
communication can continue.
FIGURE 6-4:
Device Polling.
6.4
Device Power and Layout
Considerations
6.4.1
POWERING THE MCP3221
VDD supplies the power to the device as well as the ref-
erence voltage. A bypass capacitor value of 0.1 F is
recommended. Adding a 10 F capacitor in parallel is
recommended to attenuate higher frequency noise
present in some systems.
FIGURE 6-5:
Powering the MCP3221.
6.4.2
LAYOUT CONSIDERATIONS
When laying out a printed circuit board for use with
analog components, care should be taken to reduce
noise wherever possible. A bypass capacitor from VDD
to ground should always be used with this device and
should be placed as close as possible to the device pin.
A bypass capacitor value of 0.1 F is recommended.
Digital and analog traces should be separated as much
as possible on the board, with no traces running
underneath the device or the bypass capacitor. Extra
precautions should be taken to keep traces with high-
frequency signals (such as clock lines) as far as
possible from analog traces.
Use of an analog ground plane is recommended in
order to keep the ground potential the same for all
devices on the board. Providing VDD connections to
devices in a “star” configuration can also reduce noise
by eliminating current return paths and associated
errors (Figure 6-6). For more information on layout tips
when using the MCP3221 or other ADC devices, refer
to AN688, “Layout Tips for 12-Bit A/D Converter
Applications”.
FIGURE 6-6:
VDD traces arranged in a
‘Star’ configuration in order to reduce errors
caused by current return paths.
6.4.3
USING A REFERENCE FOR
SUPPLY
The MCP3221 uses VDD as both power and a refer-
ence. In some applications, it may be necessary to use
a stable reference to achieve the required accuracy.
Figure 6-7 shows an example using the MCP1541 as a
4.096V, 2% reference.
FIGURE 6-7:
Stable Power and
Reference Configuration.
12 3 4 5 6 7 8 9
SCL
SDA
1 00 1 A2 A1A0 0 ACK
Start
Bit
Address Byte
Address bits
Device bits
R/W
Start
Bit
MCP3221 response
VDD
VDD
AIN
SCL
SDA
To
Microcontroller
10 F
MCP3221
0.1 F
VDD
RPU
VDD
Connection
Device 1
Device 2
Device 3
Device 4
VDD
4.096V
Reference
1F
0.1
F
MCP1541
CL
AIN
To
Mi
cro
con
tr
ol
le
r
MCP3221
VDD
RPU
SCL
SDA
相關(guān)PDF資料
PDF描述
LGU2D271MELZ CAP ALUM 270UF 200V 20% SNAP
SCRH5D28-101 INDUCTOR SMD 100UH 0.40A 10KHZ
STD24W-S WIRE & CABLE MARKERS
RBM10DTAH-S189 CONN EDGECARD 20POS R/A .156 SLD
EBM28DRKH-S13 CONN EDGECARD 56POS .156 EXTEND
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3221-EVM 制造商:P&S 功能描述:An Evaluation Board, RS232 Serial Cable, and A CD-ROM of Demonstration Program on PC and Related Sources 制造商:P&S 功能描述:An Evaluation Board,RS232 Serial Cable,and A CD-ROM of Demonstration Program on PC and Related Sources
MCP3221T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low Power 12-Bit A/D Converter With I2C⑩ Interface
MCP3301 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Matched Microchannel Plate Set
MCP3301_07 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI⑩ Serial Interface
MCP3301_11 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*