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AS5145

Datasheet - Pin Assignm ents

Pin 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.

Pin 3 and 4 are multi function pins for sync mode, sin/cosine mode and incremental mode.

Pin 6 Mode_Index allows switching between filtered (slow) and unfiltered (fast mode). In incremental mode, the pin changes from input to output

and provides the index pulse information. A change of the Mode during operation is not allowed. The setup must be constant during power up

and during operation.

Pins 7, 15, and 16 are supply pins, pins 5, 13, and 14 are for internal use and must not be connected.

Pin 8 (PDIO) is used to program the zero-position into the OTP(see page 19). This pin is also used as digital input to shift serial data through the

device in Daisy Chain configuration, (see page 14).

Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5145 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 (see Alignment Mode on

page 23) and programming mode (see Programming the AS5145 on page 19).

Pin 12 allows a single wire output of the 12-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,

e.g. for making a direct replacement of potentiometers possible.

CLK

10

Digital input, Schmitt-

Trigger input

Clock Input of Synchronous Serial Interface; Schmitt-Trigger input

CSn

11

Digital input pull-

down, Schmitt-Trigger

input

Chip Select. Active low. Schmitt-Trigger input, internal pull-up resistor

(50k

Ω)

PWM

12

Digital output

Pulse Width Modulation

NC

13

-

Must be left unconnected

NC

14

-

Must be left unconnected

VDD3V3

15

Supply pin

3V-Regulator Output, internally regulated from VDD5V. Connect to

VDD5V for 3V supply voltage. Do not load externally.

VDD5V

16

Supply pin

Positive Supply Voltage, 3.0V to 5.5V

Table 1. Pin Descriptions

Pin Name

Pin Number

Pin Type

Description