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| 型号： | MCP3221A7T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | ADC 12BIT I2C INTERFACE 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 |
| 其它名称： | MCP3221A7T-E/OTDKR |
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MCP3221
DS21732C-page 18
2006 Microchip Technology Inc.
6.0
APPLICATIONS INFORMATION
6.1
Driving the Analog Input
The MCP3221 has a single-ended analog input (AIN).
For proper conversion results, the voltage at the AIN
pin must be kept between VSS and VDD. If the converter
has no offset error, gain error, INL or DNL errors, and
the voltage level of AIN is equal to or less than
VSS + 1/2 LSB, the resultant code will be 000h. Addi-
tionally, if the voltage at AIN is equal to or greater than
VDD - 1.5 LSB, the output code will be FFFh.
The analog input model is shown in Figure 6-1. In this
diagram, the source impedance (RSS) adds to the inter-
nal sampling switch (RS) impedance, directly affecting
the time required to charge the capacitor (CSAMPLE).
Consequently, a larger source impedance increases
the offset error, gain error and integral linearity errors of
the conversion. Ideally, the impedance of the signal
source should be near zero. This is achievable with an
operational amplifier, such as the MCP6022, which has
a closed-loop output impedance of tens of ohms.
FIGURE 6-1:
Analog Input Model, AIN.
6.2
Connecting to the I2C Bus
The I2C bus is an open-collector bus, requiring pull-up
resistors connected to the SDA and SCL lines. This
configuration is shown in Figure 6-2.
FIGURE 6-2:
Pull-up Resistors on I2C
Bus.
The number of devices connected to the bus is limited
only by the maximum bus capacitance of 400 pF. A
possible configuration using multiple devices is shown
in Figure 6-3.
FIGURE 6-3:
Multiple Devices on I2C
Bus.
CPIN
VA
RSS
AIN
7pF
VT = 0.6V
ILEAKAGE
Sampling
Switch
SS
RS = 1 kΩ
CSAMPLE
= DAC capacitance
VSS
VDD
= 20 pF
±1 nA
Legend
VA
=
signal source
RSS = source impedance
AIN = analog input pad
CPIN = analog input pin capacitance
VT = threshold voltage
ILEAKAGE = leakage current at the pin
due to various junctions
SS
=
sampling switch
R
S
=
sampling switch resistor
CSAMPLE = sample/hold capacitance
PICmicro
SDA
SCL
VDD
RPU
RPU is typically: 10 kΩ for fSCL = 100 kHz
2k
Ω for fSCL = 400 kHz
MCP3221
Analog
Input
Signal
Microcon
trol
ler
AIN
SDA SCL
PIC16F876
Microcontroller
MCP3221
12-bit ADC
TC74
Temperature
Sensor
24LC01
EEPROM
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