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AS5045 Datasheet(PDF) 9 Page - ams AG |
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AS5045 Datasheet(HTML) 9 Page - ams AG |
9 / 24 page AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER Revision 1.5 www.austriamicrosystems.com Page 9 of 24 5 Mode Input Pin The mode input pin activates or deactivates an internal filter that is used to reduce the analog output noise. Activating the filter (Mode pin = LOW) provides a reduced output noise of 0.03° rms. At the same time, the output delay is increased to 384µs. This mode is recommended for high precision, low speed applications. Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96µs and provides an output noise of 0.06° rms. This mode is recommended for higher speed applications. The MODE pin should be set at power-up. A change of the mode during operation is not allowed. Switching the Mode pin affects the following parameters: Parameter slow mode (Mode = low) fast mode (Mode = high, VDD5V) sampling rate 2.61 kHz (384 µs) 10.42 kHz (96µs) transition noise (1 sigma) ≤ 0.03° rms ≤ 0.06° rms output delay 384µs 96µs max. speed @ 4096 samples/rev. max. speed @ 1024 samples/rev. max. speed @ 256 samples/rev. max. speed @ 64 samples/rev. 38 rpm 153 rpm 610 rpm 2441 rpm 153 rpm 610 rpm 2441 rpm 9766 rpm Table 2: Slow and fast mode parameters 12-bit Absolute Angular Position Output 5.1 Synchronous Serial Interface (SSI) D11 1 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 OCF COF LIN Mag INC Mag DEC Even PAR D11 1 18 8 t CLK FE t CSn t DO Tristate Status Bits Angular Position Data t DO valid t DO active T CLK/2 t CLK FE CSn DO CLK Figure 5: Synchronous serial interface with absolute angular position data If CSn changes to logic low, Data Out (DO) will change from high impedance (tri-state) to logic high and the read-out will be initiated. After a minimum time tCLK FE, data is latched into the output shift register with the first falling edge of CLK. Each subsequent rising CLK edge shifts out one bit of data. The serial word contains 18 bits, the first 12 bits are the angular information D[11:0], the subsequent 6 bits contain system information, about the validity of data such as OCF, COF, LIN, Parity and Magnetic Field status (increase/decrease). A subsequent measurement is initiated by a “high” pulse at CSn with a minimum duration of tCSn. 5.1.1 Data Content D11:D0 absolute angular position data (MSB is clocked out first) OCF (Offset Compensation Finished), logic high indicates the finished Offset Compensation Algorithm COF (Cordic Overflow), logic high indicates an out of range error in the CORDIC part. When this bit is set, the data at D9:D0 is invalid. The absolute output maintains the last valid angular value. This alarm may be resolved by bringing the magnet within the X-Y-Z tolerance limits. LIN (Linearity Alarm), logic high indicates that the input field generates a critical output linearity. When this bit is set, the data at D9:D0 may still be used, but can contain invalid data. This warning may be resolved by bringing the magnet within the X-Y-Z tolerance limits. Even Parity bit for transmission error detection of bits 1…17 (D11…D0, OCF, COF, LIN, MagINC, MagDEC) |
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