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ADS1113IRUGR Datasheet(PDF) 23 Page - Texas Instruments |
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ADS1113IRUGR Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 36 page  0.1 F(typ) m VDD VDD SDA SCL GPIO Microcontrolleror Microprocessor withI CPort 2 Pull-UpResistors 1k to10k (typ) W W 5 10 1 2 3 4 ADDR ALERT/RDY GND AIN0 AIN1 SCL 9 8 7 6 SDA VDD AIN3 AIN2 ADS1115 InputsSelected fromConfiguration Register ADS1113 ADS1114 ADS1115 www.ti.com SBAS444B – MAY 2009 – REVISED OCTOBER 2009 APPLICATION INFORMATION The following sections give example circuits and The ADS1113/4/5 interface directly to standard mode, suggestions for using the ADS1113/4/5 in various fast mode, and high-speed mode I2C controllers. Any situations. microcontroller I2C peripheral, including master-only and non-multiple-master I2C peripherals, can operate with the ADS1113/4/5. The ADS1113/4/5 do not BASIC CONNECTIONS perform clock-stretching (that is, they never pull the For many applications, connecting the ADS1113/4/5 clock line low), so it is not necessary to provide for is simple. A basic connection diagram for the this function unless other clock-stretching devices are ADS1115 is shown in Figure 33. on the same I2C bus. The fully differential voltage input of the ADS1113/4/5 Pull-up resistors are required on both the SDA and is ideal for connection to differential sources with SCL lines because I2C bus drivers are open-drain. moderately low source impedance, such as The size of these resistors depends on the bus thermocouples and thermistors. Although the operating speed and capacitance of the bus lines. ADS1113/4/5 can read bipolar differential signals, Higher-value resistors consume less power, but they cannot accept negative voltages on either input. increase the transition times on the bus, limiting the It may be helpful to think of the ADS1113/4/5 positive bus speed. Lower-value resistors allow higher speed voltage input as noninverting, and of the negative at the expense of higher power consumption. Long input as inverting. bus lines have higher capacitance and require smaller pull-up resistors to compensate. The resistors When the ADS1113/4/5 are converting data, they should not be too small; if they are, the bus drivers draw current in short spikes. The 0.1 μF bypass may not be able to pull the bus lines low. capacitor supplies the momentary bursts of extra current needed from the supply. Figure 33. Typical Connections of the ADS1115 Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 23 Product Folder Link(s): ADS1113 ADS1114 ADS1115 |
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