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| 型号： | MCP3221A5T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 2.7V 1CH LP SOT23-5 |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 22.3k |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 输入数目和类型： | 1 个单端，单极 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 配用： | VSUPEV2-ND - BOARD EVAL FOR MCP4022,4023,4024 MXSIGDM-ND - BOARD DEMO PICTAIL MIXED SIGNAL |
| 其它名称： | MCP3221A5T-E/OTDKR |
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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
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| MCP3221A5T-I/OT | 功能描述:模数转换器 - ADC 10-bit I2C Sgl Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3221A5T-I/OT | 制造商:Microchip Technology Inc 功能描述:A/D Converter (A-D) IC |
| MCP3221A5T-I/OT-CUT TAPE | 制造商:Microchip 功能描述:Single Channel I2C Interface 2.7 V 12-Bit A/D Converter SMT - SOT-23-5 |
| MCP3221A6-E/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Power 12-Bit A/D Converter With I2C⑩ Interface |
| MCP3221A6-I/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Power 12-Bit A/D Converter With I2C⑩ Interface |
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