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AS5040 Datasheet(PDF) 12 Page - ams AG |
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AS5040 Datasheet(HTML) 12 Page - ams AG |
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12 / 34 page  AS5040 Data Sheet www.austriamicrosystems.com Revision 2.10 11 - 33 Table 3: Magnetic Magnitude Variation Indicator Mag INCn Mag DECn Description 0 0 No distance change; Magnetic input field OK (in range, 45..75mT) 0 1 Distance increase: Pull-function. This state is dynamic, it is only active while the magnet is moving away from the chip in Z-axis 1 0 Distance decrease: Push- function. This state is dynamic, it is only active while the magnet is moving towards the chip in Z.-axis. 1 1 Magnetic Input Field invalid – out of range: <45mT or >75mT (or missing magnet) Note: Pins 1 and 2 (MagINCn, MagDECn) are open drain outputs and require external pull-up resistors. If the magnetic field is in range, both outputs are turned off. The two pins may also be combined with a single pull-up resistor. In this case, the signal is high when the magnetic field is in range. It is low in all other cases (see Table 3). Even Parity bit for transmission error detection of bits 1…15 (D9…D0, OCF, COF, LIN, MagINCn, MagDECn) 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: Table 4: Status Bit Outputs OCF COF LIN Mag INCn Mag DECn Parity 0 0 0 1 1 0 0 1 0 even checksum of bits 1:15 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 30,000 rpm without missing pulses. 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 6 below). This mode is accomplished by connecting the data output (DO; pin 9) to the data input (Prog; pin 8) of the subsequent device. An RC filter must be implemented between each PROG pin of device n and DO pin of device n+1, to prevent the encoders to enter the alignment mode, in case of ESD discharge, long cables, or not conform signal levels or shape. Using the values R=100R and C=1nF allow a max. CLK frequency of 1MHz on the whole chain. 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 7). |
Similar Part No. - AS5040_09 |
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Similar Description - AS5040_09 |
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