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AS5040 Datasheet(PDF) 5 Page - ams AG |
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AS5040 Datasheet(HTML) 5 Page - ams AG |
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5 / 28 page  AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER Revision 1.6, 03-Oct-06 www.austriamicrosystems.com Page 5 of 28 The absolute angular output is always set to a resolution of 10 bit. Placing the magnet above the chip, angular values increase in clockwise direction by default. Data D9:D0 is valid, when the status bits have the following configurations: OCF COF LIN Mag INCn Mag DECn Parity 0 0 0 1 1 0 0 1 0 even checksum of bits 1:15 Table 4: Status bit outputs The absolute angular position is sampled at a rate of 10kHz (0.1ms). This allows reading of all 1024 positions per 360 degrees within 0.1 seconds = 9.76Hz (~10Hz) without skipping any position. Multiplying 10Hz by 60, results the corresponding maximum rotational speed of 600 rpm. Readout of every second angular position allows for rotational speeds of up to 1200rpm. Consequently, increasing the rotational speed reduces the number of absolute angular positions per revolution (see Table 7). Regardless of the rotational speed or the number of positions to be read out, the absolute angular value is always given at the highest resolution of 10 bit. The incremental outputs are not affected by rotational speed restrictions due to the implemented interpolator. The incremental output signals may be used for high- speed applications with rotational speeds of up to 10,000 rpm without missing pulses. 4.2 Daisy Chain Mode The Daisy Chain mode allows connection of several AS5040’s in series, while still keeping just one digital input for data transfer (see “Data IN” in Figure 5 below). This mode is accomplished by connecting the data output (DO; pin 9) to the data input (Prog; pin 8) of the subsequent device. The serial data of all connected devices is read from the DO pin of the first device in the chain. The Prog pin of the last device in the chain should be connected to VSS. The length of the serial bit stream increases with every connected device, it is n * (16+1) bits: e.g. 34 bit for two devices, 51 bit for three devices, etc… The last data bit of the first device (Parity) is followed by a logic low bit and the first data bit of the second device (D9), etc… (see Figure 6). 4.2.1 Programming Daisy Chained Devices In Daisy Chain mode, the Prog pin is connected directly to the DO pin of the subsequent device in the chain (see Figure 5). During programming (see section 9), a programming voltage of 7.5V must be applied to pin Prog. This voltage level exceeds the limits for pin DO, so one of the following precautions must be made during programming: • open the connection DO Prog during programming or • add a Schottky diode between DO and Prog (Anode = DO, Cathode = Prog) Due to the parallel connection of CLK and CSn, all connected devices may be programmed simultaneously. AS5040 1st Device Prog DO CLK CSn CLK µC Prog DO CLK CSn Prog DO CLK CSn Data IN CSn AS5040 2nd Device AS5040 last Device Figure 5: Daisy Chain hardware configuration |
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