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AS5145B Datasheet(PDF) 5 Page - ams AG |
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AS5145B Datasheet(HTML) 5 Page - ams AG |
5 / 36 page www.ams.com/AS5145 Revision 1.17 5 - 36 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 |
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