MCP3912 datasheet(21/82 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005348A-page 21

MCP3912

3.14

Master Reset (RESET)

This pin is active-low and places the entire chip in a

Reset state when active.

When RESET is logic low, all registers are reset to their

default value, no communication can take place and no

clock is distributed inside the part, except in the input

structure if MCLK is applied (if MCLK is idle, then no

clock is distributed). This state is equivalent to a Power-

On Reset (POR) state.

Since the default state of the ADCs is on, the analog

power consumption when RESET is logic low is

equivalent to when RESET is logic high. Only the digital

power consumption is largely reduced, because this

current consumption is essentially dynamic and is

reduced drastically when there is no clock running.

All the analog biases are enabled during a Reset, so

that the part is fully operational just after a RESET

rising edge if MCLK is applied when RESET is logic

low. If MCLK is not applied, there is a time after a hard

reset when the conversion may not accurately

correspond to the start-up of the input structure.

This input is Schmitt-triggered.

3.15

Digital Power Supply (DVDD)

DVDD is the power supply voltage for the digital circuitry

within the MCP3912. It is distributed on several pins

(pins 12 and 24 in the QFN-28 package, one pin only in

the SSOP-28 package). For optimal performance, it is

recommended to connect these pins together using a

star connection and to connect appropriate bypass

capacitors (typically a 10 µF in parallel with a 0.1 µF

ceramic). DVDD should be maintained between 2.7V

and 3.6V for specified operation.

At least one of these pins needs to be properly con-

nected to ensure proper functionality of the device. All

of these pins need to be properly connected to ensure

optimal performance of the device. If any of these pins

are left floating, the accuracy and noise specifications

are not ensured.

3.16

Exposed Thermal Pad

This pin must be connected to AGND or left floating for

proper operation. Connecting it to AGND is preferable

for lowest noise performance and best thermal

behavior.

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