Datasheet AD7416, AD7417, AD7418 (Analog Devices) - 9

link to page 17
Data Sheet AD7416/AD7417/AD7418 SDA 1 8 VDD SCL 2 AD7416 7 A0 OTI 3 TOP VIEW 6 A1
6 0 0
GND 4 (Not to Scale) 5 A2
26- 1 01 Figure 7. AD7416 Pin Configuration (SOIC/MSOP)
Table 5. AD7416 Pin Function Descriptions Pin No. Mnemonic Description
1 SDA Digital I/O. Serial bus bidirectional data. Push-pull output. 2 SCL Digital Input. Serial bus clock. 3 OTI This pin is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is greater than an 8-bit word in the TOTI setpoint register. The signal is reset at the end of a serial read operation. Open-drain output. 4 GND Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry. 5 A2 Digital Input. This is the highest programmable bit of the serial bus address. 6 A1 Digital Input. This is the middle programmable bit of the serial bus address. 7 A0 Digital Input. This is the lowest programmable bit of the serial bus address. 8 VDD Positive Supply Voltage, 2.7 V to 5.5 V.
SDA 1 8 CONVST SCL 2 AD7418 7 VDD OTI 3 TOP VIEW 6 REFIN GND
-007
4 (Not to Scale) 5 AIN
126 01 Figure 8. AD7418 Pin Configuration (SOIC/MSOP)
Table 6. AD7418 Pin Function Descriptions Pin No. Mnemonic Description
1 SDA Digital I/O. Serial bus bidirectional data. Push-pull output. 2 SCL Digital Input. Serial bus clock. 3 OTI This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is greater than an 8-bit word in the TOTI setpoint register. The signal is reset at the end of a serial read operation. Open-drain output. 4 GND Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry. 5 AIN Analog Input Channel. The input channel is single-ended with respect to GND. The input channel can convert voltage signals in the range of 0 V to VREF. The analog input channel is selected by writing to the configuration register of the AD7418 and choosing Channel 4. 6 REFIN Reference Input. An external 2.5 V reference can be connected to the AD7418 at this pin. To enable the on-chip reference, the REFIN pin should be tied to GND. If an external reference is connected to the AD7418, the internal reference shuts down. 7 VDD Positive Supply Voltage, 2.7 V to 5.5 V. 8 CONVST Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The power-up time for the part is 4 μs. If the CONVST pulse is greater than 4 μs, the falling edge of CONVST places the track-and-hold mode into hold mode and initiates a conversion. If the pulse is less than 4 μs, an internal timer ensures that the track-and-hold does not go into hold, and conversion is not initiated until the power-up time has elapsed. The track-and-hold goes into track mode again at the end of conversion (see the Operating Modes section). Rev. J | Page 9 of 23 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS TABLE OF CONTENTS REVISION HISTORY PRODUCT HIGHLIGHTS SPECIFICATIONS AD7417/AD7418 SPECIFICATIONS AD7416 SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS ON-CHIP REFERENCE TEMPERATURE MEASUREMENT INTERNAL REGISTER STRUCTURE Address Pointer Register Temperature Value Register (Address 0x00) Configuration Register (Address 0x01) THYST Setpoint Register (Address 0x02) TOTI Setpoint Register (Address 0x03) ADC Value Register (Address 0x04) ADC Transfer Function Config2 Register (Address 0x05) SERIAL BUS INTERFACE Serial Bus Address Writing to the AD7416/AD7417/AD7418 Reading Data From the AD7416/AD7417/AD7418 OTI OUTPUT FAULT QUEUE POWER-ON DEFAULTS OPERATING MODES Mode 1 Mode 2 CONVSTB START MODE CONVSTB Pin Mode APPLICATIONS INFORMATION SUPPLY DECOUPLING POWER-ON RESET MOUNTING THE AD7416/AD7417/AD7418 FAN CONTROLLER THERMOSTAT SYSTEM WITH MULTIPLE AD7416 DEVICES OUTLINE DIMENSIONS ORDERING GUIDE