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AS5043TR Datasheet(PDF) 5 Page - ams AG |
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AS5043TR Datasheet(HTML) 5 Page - ams AG |
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5 / 26 page  AS5043 Programmable 360° Magnetic Angle Encoder Revision 1.4, 04-Apr-06 www.austriamicrosystems.com Page 5 of 26 MagInc, (Magnitude Increase) becomes HIGH, when the magnet is pushed towards the IC, thus the magnetic field strength is increasing. MagDec, (Magnitude Decrease) becomes HIGH, when the magnet is pulled away from the IC, thus the magnetic field strength is decreasing. Both signals HIGH indicate a magnetic field that is out of the allowed range (see Table 3). Note: Pin 1 (MagRngn) is a combination of MagInc and MagDec. It is active low via an open drain output and requires an external pull-up resistor. If the magnetic field is in range, this output is turned off. (logic “high”). Even Parity bit for transmission error detection of bits 1…15 (D9…D0, OCF, COF, LIN, MagInc, MagDec) The absolute angular output is always set to a resolution of 10 bit / 360°. Placing the magnet above the chip, angular values increase in clockwise direction by default. Even PAR CSn CLK DO D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 18 16 COF LIN OCF Ma g IN C Ma g DEC t DO active t DO Tristate 1 D9 t CLK FE t DO valid t CLK FE t CSn T CLK / 2 Angular Position Data Status Bits Figure 5: Synchronous serial interface with absolute angular position data 8.2 Z-Axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator) The AS5043 provides several options of detecting movement and distance of the magnet in the vertical (Z-) direction. Signal indicators MagINC, MagDEC and LIN are available as status bits in the serial data stream, while MagRngn is an open-drain output that indicates an out-of range status (on in YELLOW or RED range). Additionally, the analog output provides a safety feature in the form that it will be turned off when the magnetic field is too strong or too weak (RED range). The serial data is always available, the red/yellow/green status is indicated by the status bits as shown below: SSI Status bits Hardware Pins Mag INC Mag DEC LIN Mag Rngn Analog output Description 0 0 0 Off enabled No distance change Magnetic Input Field OK (GREEN range, ~45…75mT) 0 1 0 Off enabled Distance increase, GREEN range; Pull-function. This state is dynamic and only active while the magnet is moving away from the chip. 1 0 0 Off enabled Distance decrease, GREEN range; Push- function. This state is dynamic and only active while the magnet is moving towards the chip. 1 1 0 On enabled YELLOW Range: Magnetic field is ~ 25…45mT or ~75…135mT. The AS5043 may still be operated in this range, but with slightly reduced accuracy. 1 1 1 On disabled RED Range: Magnetic field is ~<25mT or >~135mT. The analog output will be turned off in this range by default. It can be enabled permanently by OTP programming (see 11.1.2). It is still possible to use the absolute serial interface in the red range, but not recommended. Table 3: Magnetic field strength indicators |
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