SDA is the serial data pin of the I
參數(shù)資料
型號(hào)： MCP3421A0T-E/CH
廠商： Microchip Technology
文件頁(yè)數(shù)： 2/42頁(yè)
文件大?。?/td> 0K
描述： IC ADC 18BIT 3.75SPS 1CH SOT23-6
產(chǎn)品培訓(xùn)模塊： MCP3901 Analog Front End
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 18
采樣率（每秒）： 3.75
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： SOT-23-6
供應(yīng)商設(shè)備封裝： SOT-23-6
包裝： 標(biāo)準(zhǔn)包裝
輸入數(shù)目和類型： 2 個(gè)單端，雙極；1 個(gè)差分，單極
產(chǎn)品目錄頁(yè)面： 672 (CN2011-ZH PDF)
其它名稱： MCP3421A0T-E/CHDKR
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
“I2C Serial Communications” for more details of I2C
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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