AS5045 datasheet(2/24 Pages) AMSCO

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AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.5

www.austriamicrosystems.com

Page 2 of 24

Pin Configuration

MagINCn

MagDECn

Mode

VSS

Prog_DI

CLK

CSn

PWM

VDD3V3

VDD5V

Figure 2: Pin configuration SSOP16

2.1

Pin Description

Table 1 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 supply pins, pins 3, 4, 5, 6, 13 and 14

are for internal use and must not be connected.

Pins 1 and 2 MagINCn and MagDECn are the magnetic

field change indicators (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.

Pin 6 Mode allows switching between filtered (slow) and

unfiltered (fast mode). This pin must be tied to VSS or

VDD5V, and must not be switched after power up. See

section 5.

Pin Symbol

Type

Description

MagINCn

DO_OD

Magnet Field Magnitude INCrease;

active low, indicates a distance

reduction between the magnet and

the device surface. See Table 5

MagDECn

DO_OD

Magnet Field Magnitude DECrease;

active low, indicates a distance

increase between the device and the

magnet. See Table 5

Must be left unconnected

Mode

Select between slow (low, VSS) and

fast (high, VDD5V) mode. Internal

pull-down resistor.

VSS

Negative Supply Voltage (GND)

Prog_DI

DI_PD

OTP Programming Input and Data

Input for Daisy Chain mode. Internal

pull-down resistor (~74k

Ω).

Connect to VSS if not used

DO_T

Data Output of

Synchronous Serial Interface

Pin Symbol

Type

Description

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)

PWM

Pulse Width Modulation of approx.

244Hz; 1µs/step

(opt. 122Hz; 2µs/step)

Must be left unconnected

VDD3V3

3V-Regulator Output, internally

regulated from VDD5V. Connect to

VDD5V for 3V supply voltage. Do not

load externally.

VDD5V

Positive Supply Voltage, 3.0 to 5.5 V

Table 1: 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

Pin 8 Prog is used to program the zero-position into the

OTP (see chapter 8.1).

This pin is also used as digital input to shift serial data

through the device in Daisy Chain configuration,

(see page 11).

Pin 11 Chip Select (CSn; active low) selects a device

within a network of AS5045 encoders and initiates serial

data transfer. A logic high at CSn puts the data output

pin (DO) to tri-state and terminates serial data transfer.

This pin is also used for alignment mode (Figure 14) and

programming mode (Figure 10).

Pin 12 PWM allows a single wire output of the 10-bit

absolute position value. The value is encoded into a

pulse width modulated signal with 1µs pulse width per

step (1µs to 4096µs over a full turn). By using an

external low pass filter, the digital PWM signal is

converted into an analog voltage, making a direct

replacement of potentiometers possible.

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