MCP2036-ESLASHP datasheet(5/30 Pages) MICROCHIP

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DS22186B-page 5

MCP2036

2.0

PIN DESCRIPTION

Descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

2.1

Chip Select (CS)

The circuit is fully enabled when a logic-low is applied

to the CS input. The circuit enters in Low-Power mode

when a logic-high is applied to this input. During

Low-Power mode, the detector output voltage falls to

VREF and the supply current is reduced to 0.5 μA (typ.).

This pin has an internal pull-up resistor to ensure

proper selection of the circuit.

2.2

Voltage Reference (VREF)

VREF is a mid-scale reference output. It can source and

sink small currents and has low output impedance. A

load capacitor between 100nF and 1μF needs to be

located close to this pin.

2.3

Power Supply (VDD, VSS)

The VDD pin is the power supply pin for the analog and

digital circuitry within the MCP2036. This pin requires

an appropriate bypass capacitor of 100nF. The voltage

on this pin should be maintained in the 2.7V-5.5V range

for specified operation.

The VSS pin is the ground pin and the current return

path for both analog and digital circuitry of the

MCP2036. If an analog ground plane is available, it is

recommended that this device be tied to the analog

ground plane of the PCB.

2.4

Inductor Inputs (LREF, LBTN)

These pins are inputs for the external coils (reference

and sensor). The inputs should be AC coupled to the

coils by a 10nF ceramic capacitor.

2.5

Input Selection (REFSEL)

Digital input that is used to select between coil inputs

(reference and sensor).

2.6

Clock (CLK)

The external clock input is used for synchronous

detection of the AC waveforms on the coils. The clock

signal is also used to generate a triangular waveform

applied to coil driver input.

2.7

Inductor Driver Input (DRVIN)

The analog input to the coil driver. The triangular

waveform applied to this input should be in phase with

the clock signal for best performance.

2.8

Inductor Driver Output (DRVOUT)

Driver output used to excite the sensor coils. It is a

current-mode output designed to drive small inductive

loads.

Pad Name

Pin Number

I/O

Type

Description

14 Pins

16 Pins

VREF

OUT

Voltage Reference

LREF

Reference Inductor Input

LBTN

Active Inductor Input

VDD

PWR

Power Supply

DRVOUT

OUT

Current Driver Output for Inductors

DRVIN

Current Driver Input

CLK

CMOS

Clock Signal

REFSEL

CMOS

Detector Select Input

CMOS

Chip Select, Active low

Reserved

—

Must be tied to GND for proper

operation.

VSS

PWR

Power Supply Return

VDETOUT

OUT

Detector Output Voltage

VDET-

Negative Input for Output Detector

VDET+

Positive Input for Output Detector

—

No connect

—

No connect

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