AS5040 datasheet(2/28 Pages) AMSCO

2 / 28 page

AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.6, 03-Oct-06

www.austriamicrosystems.com

Page 2 of 28

Pin Configuration

MagINCn

MagDECn

A_LSB_U

B_Dir_V

Index_W

VSS

Prog

CLK

CSn

PWM_LSB

VDD3V3

VDD5V

Figure 2: Pin configuration SSOP16

2.1

Pin Description

Table 2 shows the description of each pin of the standard

SSOP16 package (Shrink Small Outline Package,

16 leads, body size: 5.3mm x 6.2mmm; see Figure 2).

Pins 7, 15 and 16 are supply pins, pins 5, 13 and 14 are

for internal use and must not be connected.

Pins 1 and 2 are the magnetic field change indicators,

MagINCn and MagDECn (magnetic field strength

increase or decrease through variation of the distance

between the magnet and the device). These outputs can

be used to detect the valid magnetic field range.

Furthermore those indicators can also be used for

contact-less push-button functionality.

Pins 3, 4 and 6 are the incremental pulse output pins.

The functionality of these pins can be configured through

programming the one-time programmable (OTP) register:

Output Mode

Pin 3

Pin 4

Pin 6

Pin 12

1.x: quadrature

Index

PWM

2.x:step/direction

LSB

Direction

Index

PWM

3.x: commutation

LSB

Table 1: Pin assignment for the different incremental output modes

Mode 1.x: Quadrature A/B Output:

Represents the default quadrature A/B signal mode.

Mode 2.x: Step / Direction Output:

Configures pin 3 to deliver up to 512 pulses (up to 1024

state changes) per revolution. It is equivalent to the LSB

(least significant bit) of the absolute position value. Pin 4

provides the information of the rotational direction.

Both modes (mode 1.x and mode 2.x) provide an index

signal (1 pulse/revolution) with an adjustable width of

one LSB or three LSB’s.

Symbol

Type

Description

MagINCn

DO_OD

Magnet Field Magnitude INCrease;

active low, indicates a distance

reduction between the magnet and the

device surface.

MagDECn

DO_OD

Magnet Field Magnitude DECrease;

active low, indicates a distance increase

between the device and the magnet.

A_LSB_U

Mode1.x: Quadrature A channel

Mode2.x: Least Significant Bit

Mode3.x: U signal (phase1)

B_Dir_V

Mode1.x: Quadrature B channel

quarter period shift to channel A.

Mode2.x: Direction of Rotation

Mode3.x: V signal (phase2)

Must be left unconnected

Index_ W

Mode1.x and Mode2.x : Index signal

indicates the absolute zero position

Mode3.x: W signal (phase3)

VSS

Negative Supply Voltage (GND)

Prog

DI_PD

OTP Programming Input and Data Input

for Daisy Chain mode. Internal pull-

down resistor (~74k

Ω).

May be connected to VSS if

programming is not used

DO_T

Data Output of

Synchronous Serial Interface

CLK

DI,

Clock Input of

Synchronous Serial Interface; Schmitt-

Trigger input

CSn

DI_PU,

Chip Select, active low; Schmitt-Trigger

input, internal pull-up resistor (~50k

Ω)

connect to VSS in incremental mode

(see 5.2.1)

PWM_LSB

Pulse Width Modulation of approx.

1kHz; LSB in Mode3.x

Must be left unconnected

VDD3V3

3V-Regulator Output (see Figure 18)

VDD5V

Positive Supply Voltage 5 V

Table 2: Pin description SSOP16

DO_OD

digital output open drain

supply pin

digital output

digital input

DI_PD

digital input pull-down

DO_T digital output /tri-state

DI_PU

digital input pull-up

Schmitt-Trigger input

Mode 3.x: Brushless DC Motor Commutation Mode:

In addition to the absolute encoder output over the SSI

interface, this mode provides commutation signals for

brushless DC motors with either one pole pair or two pole

pair rotors. The commutation signals are usually provided

by 3 discrete Hall switches, which are no longer required,

as the AS5040 can fulfill two tasks in parallel: absolute

encoder + BLDC motor commutation.

In this mode, pin 12 provides the LSB output instead of

the PWM (Pulse-Width-Modulation) signal.

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