Electronic Components Datasheet Search |
|
SA8281MP1S Datasheet(PDF) 9 Page - Mitel Networks Corporation |
|
SA8281MP1S Datasheet(HTML) 9 Page - Mitel Networks Corporation |
9 / 14 page 9 SA828 Fig. 17 Typical SA828 programming routine WRITE R1 WRITE R2 WRITE R4 POWER ON WRITE R0 RST ↓ 0 RST ↑ 1 CHANGE CONTROL DATA ? CHANGE INITIALISATION DATA ? YES NO YES NO WRITE R1 WRITE R2 WRITE R3 WRITE R0 WRITE R1 WRITE R2 WRITE R3 WRITE R0 WRITE INITIALISATION DATA WRITE TO CONTROL REGISTER INHIBITING PWM OUTPUTS BEFORE COMPLETING RESET CYCLE ENABLE PWM OUTPUTS WRITE CONTROL DATA Control Register Programming Example The control register would normally be updated many times while the motor is running, but just one example is given here. It is assumed that the initialisation register has already heen programmed with the parameters given in the previous example. A power waveform of 100Hz is required with a PWM waveform amplitude of 80% of that stored in the ROM. The phase sequence should be set to give forward motor rotation.The outputs should be enabled and no overmodulation is required. 1. Setting the power frequency The power frequency, fPOWER, can be selected to 12-bit accuracy (i.e 4096 equal steps) from 0Hz to fRANGE as defined in the initialisation register. In this case, with fRANGE = 250Hz, the power frequency can be adjusted in increments of 0·06Hz. We can only have pfs as an integer, so if we assign pfs = 1638 this gives fPOWER = 99.97 Hz.The 12-bit binary equivalent of this value gives a PFS word of 011001100110 in temporary registers R0 and R1. 2. Setting overmodulation, forward/reverse, output inhibit Overmodulation is not required therefore OM = 0. Forward motor control is required (i.e., the phase sequence of the PWM outputs should be red-yellow-blue) therefore forward/ reverse bit F/R = 0. Output inhibit should be inactive (i e., the outputs should be active), therefore INH= 1. These bits are all set in temporary register R1. 3. Setting the power waveform amplitude APOWER x 255 100 APOWER =x 100% 0 1 1 0 0 0 1 1 Temporary Register R0 0 0 1 X 0 1 1 0 Temporary Register R1 1 1 0 0 Temporary Register R2 1100 PFS7 PFS6 PFS5 PFS4 PFS3 PFS2 PFS1 PFS0 F/R OM INH X PFS11 PFS10 PFS9 PFS8 AMP7 AMP6 AMP5 AMP4 AMP3 AMP2 AMP1 AMP0 Fig. 16 The 8-bit binary equivalent of this value gives an AMP word of 11001100 in temporary register R2. The data which must be programmed into the three temporary registers R0, R1 and R2 (for transfer into the control register) in order to achieve the parameters in the example given, is shown in Fig. 16. 80 x 255 100 ⇒ A = = = 204 fPOWER x 4096 fRANGE fRANGE 4096 ⇒ pfs = = = 1638·4 100 x 4096 250 A 225 fPOWER = x pfs |
Similar Part No. - SA8281MP1S |
|
Similar Description - SA8281MP1S |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |