MCP3906 datasheet(9/26 Pages) MICROCHIP

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DS21948C-page 9

MCP3905/06

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Digital VDD (DVDD)

DVDD is the power supply pin for the digital circuitry

within the MCP3905/06.

DVDD requires appropriate bypass capacitors and

should be maintained to 5V ±10% for specified

operation. Please refer to Section 5.0 “Applications

Information”.

3.2

High-Pass Filter Input Logic Pin

(HPF)

HPF controls the state of the high-pass filter in both

input channels. A logic ‘1’ enables both filters,

removing any DC offset coming from the system or the

device. A logic ‘0’ disables both filters, allowing DC

voltages to be measured.

3.3

Analog VDD (AVDD)

AVDD is the power supply pin for the analog circuitry

within the MCP3905/06.

AVDD requires appropriate bypass capacitors and

should be maintained to 5V ±10% for specified

operation. Please refer to Section 5.0 “Applications

Information”.

3.4

Current Channel (CH0-, CH0+)

CH0- and CH0+ are the fully differential analog voltage

input channels for the current measurement, containing

a PGA for small-signal input, such as shunt current-

sensing. The linear and specified region of this channel

is dependant on the PGA gain. This corresponds to a

maximum differential voltage of ±470 mV/GAIN and

maximum absolute voltage, with respect to AGND, of

±1V. Up to ±6V can be applied to these pins without the

risk of permanent damage.

Refer to Section 1.0 “Electrical Characteristics”.

Pin No.

Symbol

Function

1DVDD

Digital Power Supply Pin

HPF

High-Pass Filters Control Logic Pin

3AVDD

Analog Power Supply Pin

No Connect

CH0+

Non-Inverting Analog Input Pin for Channel 0 (Current Channel)

CH0-

Inverting Analog Input Pin for Channel 0 (Current Channel)

CH1-

Inverting Analog Input Pin for Channel 1 (Voltage Channel)

CH1+

Non-Inverting Analog Input Pin for Channel 1 (Voltage Channel)

9MCLR

Master Clear Logic Input Pin

REFIN/OUT

Voltage Reference Input/Output Pin

AGND

Analog Ground Pin, Return Path for internal analog circuitry

Frequency Control for HFOUT Logic Input Pin

Frequency Control for FOUT0/1 Logic Input Pin

Gain Control Logic Input Pin

OSC1

Oscillator Crystal Connection Pin or Clock Input Pin

OSC2

Oscillator Crystal Connection Pin or Clock Output Pin

No Connect

NEG

Negative Power Logic Output Pin

DGND

Digital Ground Pin, Return Path for Internal Digital Circuitry

HFOUT

High-Frequency Logic Output Pin (Intended for Calibration)

FOUT1

Differential Mechanical Counter Logic Output Pin

FOUT0

Differential Mechanical Counter Logic Output Pin

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