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AS5040 Datasheet(PDF) 9 Page - ams AG |
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AS5040 Datasheet(HTML) 9 Page - ams AG |
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9 / 28 page  AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER Revision 1.6, 03-Oct-06 www.austriamicrosystems.com Page 9 of 28 Commutation - Mode 3.2 (Two-pole-pairs) U V W Position: 0 85 171 256 341 427 512 597 683 768 853 939 0 Angle: 0.0 29.88 60.12 90.0 119.88 150.12 180.0 209.88 240.12 270.00 299.88 330.12 360.0 Width: 256 Steps Width: 256 Steps CW Direction Figure 12: U, V and W-signals for 2pole BLDC motor commutation (Div1=1; Div0=0) 9 Programming the AS5040 After power-on, programming the AS5040 is enabled with the rising edge of CSn with Prog = high and CLK = low. 16 bit configuration data must be serially shifted into the OTP register via the Prog-pin. The first “CCW” bit is followed by the zero position data (MSB first) and the incremental mode setting as shown in Table 6. Data must be valid at the rising edge of CLK (see Figure 13). After writing data into the OTP register it can be permanently programmed by rising the Prog pin to the programming voltage VPROG. 16 CLK pulses (tPROG) must be applied to program the fuses (Figure 14). To exit the programming mode, the chip must be reset by a power- on-reset. The programmed data is available after the next power-up. Note: During the programming process, the transitions in the programming current may cause high voltage spikes generated by the inductance of the connection cable. To avoid these spikes and possible damage to the IC, the connection wires, especially the signals Prog and VSS must be kept as short as possible. The maximum wire length between the VPROG switching transistor and pin Prog (see Figure 15) should not exceed 50mm (2 inches). To suppress eventual voltage spikes, a 10nF ceramic capacitor should be connected close to pins Prog and VSS. This capacitor is only required for programming, it is not required for normal operation. The clock timing tclk must be selected at a proper rate to ensure that the signal Prog is stable at the rising edge of CLK (see Figure 13). Additionally, the programming supply voltage should be buffered with a 10µF capacitor mounted close to the switching transistor. This capacitor aids in providing peak currents during programming. The specified programming voltage at pin Prog is 7.3 – 7.5V (see section 16.7). To compensate for the voltage drop across the VPROG switching transistor, the applied programming voltage may be set slightly higher (7.5 - 8.0V, see Figure 15). OTP Register Contents: CCW Counter Clockwise Bit ccw=0 – angular value increases in clockwise direction ccw=1 – angular value increases in counterclockwise direction Z [9:0] Programmable Zero / Index Position Indx Index Pulse Width Selection: 1LSB / 3LSB Div1,Div0 Divider Setting of Incremental Output Md1, Md0 Incremental Output Mode Selection 9.1 OTP Default Setting The AS5040 can also be operated without programming. The default, un-programmed setting is shown in Table 6 (Mode 0.0): CCW: 0 = clockwise operation Z9 to Z0: 00 = no programmed zero position Indx: 0 = Index bit width = 1LSB Div0,Div1 : 00 = incremental resolution = 10bit Md0, MD1: 00 = incremental mode = quadrature |
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