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| 型号： | MCP3421DM-WS |
| 厂商： | Microchip Technology |
| 文件页数： | 2/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO MCP3421 WEIGHT SCALE |
| 标准包装： | 1 |
| 主要目的： | 参考设计，称量台 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP3421，MCP6V07，PIC18F4550 |
| 主要属性： | 2Kg测压元件，灵敏度为1 mV/V |
| 已供物品： | 板，线缆，CD，电源 |
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MCP3421
DS22003E-page 10
2009 Microchip Technology Inc.
3.4
Serial Data Pin (SDA)
SDA is the serial data pin of the I2C interface. The SDA
pin is used for input and output data. In read mode, the
conversion result is read from the SDA pin (output). In
write mode, the device configuration bits are written
(input) though the SDA pin. The SDA pin is an open-
drain N-channel driver. Therefore, it needs a pull-up
resistor from the VDD line to the SDA pin. Except for
start and stop conditions, the data on the SDA pin must
be stable during the high period of the clock. The high
or low state of the SDA pin can only change when the
clock signal on the SCL pin is low. Refer to
Serial Interface communication.
Typical range of the pull-up resistor value for SCL and
SDA is from 5 k
Ω to 10 kΩ for standard (100 kHz) and
fast (400 kHz) modes, and less than 1 k
Ω for high
speed mode (3.4 MHz). The High-Speed mode is not
recommended for VDD less than 2.7V.
FIGURE 3-1:
Equivalent Analog Input Circuit.
CPIN
V
RSS
VIN+,VIN-
4pF
VT = 0.6V
ILEAKAGE
Sampling
Switch
SS
RS
CSAMPLE
(3.2 pF)
VDD
(~ ±1 nA)
Legend:
V
=
Signal Source
ILEAKAGE = Leakage Current at Analog Pin
RSS = Source Impedance
SS
=
Sampling Switch
VIN+, VIN- = Analog Input Pin
RS = Sampling Switch Resistor
CPIN = Input Pin Capacitance
CSAMPLE = Sample Capacitance
VT = Threshold Voltage
D1, D2 =
ESD Protection Diode
D1
D2
VSS
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