AD7294BCPZRL datasheet(14/48 Pages) AD

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Data Sheet

AD7294

Rev. I | Page 13 of 47

TQFP Pin No.

LFCSP Pin No.

Mnemonic

Description

SCL

Serial I2C Bus Clock. The data transfer rate in I2C mode is compatible with both

100 kHz and 400 kHz operating modes. Open-drain input; external pull-up

resistor required.

OPGND

Dedicated Ground Pin for I2C Interface.

VDRIVE

Logic Power Supply. The voltage supplied at this pin determines at what

voltage the interface operates. Decouple this pin to DGND. The voltage range

on this pin is 2.7 V to 5.5 V and may be different to the voltage level at AVDD

and DVDD, but should never exceed either by more than 0.3 V. To set the input

and output thresholds, connect this pin to the supply to which the I2C bus is

pulled.

43, 47, 48

38, 42

DGND

Digital Ground. This pin is the ground for all digital circuitry.

DVDD

Logic Power Supply. The operating range is 4.5 V to 5.5 V. These pins provide

the supply voltage for all the digital circuitry on the AD7294. Connect the AVDD

and DVDD pins together to ensure that all supply pins are at the same potential.

Decouple this supply to DGND with a10 µF tantalum capacitor and a 0.1 µF

ceramic capacitor.

46, 45

41, 40

ISENSE1

OVERRANGE,

ISENSE2

OVERRANGE

Fault Comparator Outputs. These pins connect to the high-side current sense

amplifiers.

49, 50, 51, 52

43, 44, 45, 46

VIN3 to VIN0

Uncommitted ADC Analog Inputs. These pins are programmable as four

single-ended channels or two true differential analog input channel pairs. See

Table 1 and Table 13 for more details.

REFOUT/REFIN ADC

ADC Reference Input/Output Pin. The REFOUT/REFIN ADC pin provides the

reference source for the ADC. Upon power-up, the default configuration of this

pin is external reference (REFIN). Enable the internal reference by writing to the

power-down register; see Table 27. Connect decoupling capacitors (220 nF

recommended) to this pin to decouple the reference buffer. Provided the

output is buffered, the on-chip reference can be taken from this pin and

applied externally to the rest of a system. A maximum external reference

voltage of 2.5 V can be supplied to the REFOUT portion of the REFOUT/REFIN

ADC pin.

DCAP

External Decoupling Capacitor Input for Internal Temperature Sensor.

Decouple this pin to AGND using a 0.1 μF capacitor. In normal operation, the

voltage is typically 3.7 V.

62, 63

55, 56

VPP1, VPP2

Current Sensor Supply Pins. Power supply pins for the high-side current sense

amplifiers. Operating range is from AVDD to 59.4 V. Decouple this supply to

AGND. See the Current Sense Filtering section.

N/A1

EPAD

The exposed pad is located on the underside of the package. Connect the

exposed pad to the ground plane of the PCB using multiple vias.

N/A means not applicable.

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