MCP3909 datasheet(13/40 Pages) MICROCHIP

13 / 40 page

DS22025A-page 13

MCP3909

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 MCP3909.

This pin requires appropriate bypass capacitors and

should be maintained to 5V ±10% for specified

operation.

Refer

Section 6.0

“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 MCP3909.

This pin requires appropriate bypass capacitors and

should be maintained to 5V ±10% for specified

operation.

Refer

Section 6.0

“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/G 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

SCK / F2

Serial Clock or Frequency Control for HFOUT Logic Input Pin

SDI / F1

Serial Data Input or Frequency Control for FOUT0/1 Logic Input Pin

CS / F0

Chip Select or 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

SDO / NEG

Serial Data Out or 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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