MCP39F521 datasheet(13/52 Pages) MICROCHIP

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DS20005442A-page 13

MCP39F521

3.15

Digital Ground Connection Pins

(DGND)

DGND is the ground connection to internal digital

circuitry (SINC filters, oscillator, serial interface). If a

digital ground plane is available, it is recommended to

tie this pin to the digital plane of the PCB. This plane

should also reference all other digital circuitry in the

system.

3.16

Digital Power Supply Pin (DVDD)

DVDD is the power supply pin for the digital circuitry

within the MCP39F521. This pin requires appropriate

bypass capacitors and should be maintained between

2.7V and 3.6V for specified operation. It is

recommended to use 0.1 µF ceramic capacitors.

3.17

Data Ready Pin (DR)

The data ready pin indicates if a new delta-sigma A/D

conversion result is ready to be processed. This pin is

for indication only and should be left floating. After each

conversion is finished, a low pulse will take place on the

Data Ready pin to indicate that the conversion result is

ready and an interrupt is generated in the calculation

engine (CE). This pulse is synchronous with the line

frequency to ensure an integer number of samples for

each line cycle.

3.18

Exposed Thermal Pad (EP)

This pin is the exposed thermal pad. It must be

connected to DGND.

Note:

This pin is internally connected to the IRQ

of the calculation engine and should be

left floating.

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