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參數資料
| 型號： | ADMC330BST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數字信號處理 |
| 英文描述： | Single Chip DSP Motor Controller |
| 中文描述： | 0-BIT, 20 MHz, OTHER DSP, PQFP80 |
| 封裝： | PLASTIC, TQFP-80 |
| 文件頁數： | 7/20頁 |
| 文件大小： | 163K |
| 代理商： | ADMC330BST |
ADMC330
–7–
REV. 0
PWMDT
START
END
PWMDT
AH
AL
BH
BL
CH
CL
PWMSYNC
PWMDT
PWMDT
PWMDT
PWMDT
PWMCHC
PWMCHB
PWMTM
PWMCHA
Figure 2. Three-Phase Center-Based Active Low PWM Waveforms
For example, the HCL K clock is 10 MHz. If 8 kHz PWM
waveforms are required, then PWMT M should be loaded
with 10 MHz/8 kHz = 1250. A value must be written to the
PWMT M register before the PWM block can be used.
T he ON time of each pair of PWM waveforms, e.g., AH and AL ,
is set by the integer value in the duty cycle registers PWMCHA,
PWMCHB and PWMCHC. T he deadtime between the active
portions of complementary waveforms is set by the value in the
deadtime register PWMDT and is subtracted from the value in
the duty cycle register. T he final deadtime adjusted fractional
duty cycle for Channel A for example is given by:
t
Aon
T
PWM
d
A
=
=
PWMCHA
±
PWMDT
PWMTM
T he minimum pulsewidth delivered is set by the value in the
pulse deletion register PWMPD. When the calculated high or
low pulsewidth for any channel is less than PWMPD, the
switching pulse is eliminated and the outputs are saturated one
to 100% high, and the other to 100% low.
Output Control Unit
T he Output Control Unit contains special features that allow
the ADMC330 to be easily applied for the control of electroni-
cally commutated motors (ECM) or brushless dc motors
(BDCM). In these machines, only two motor phases are required
to conduct simultaneously so that at most two power switches are
turned on at any time. In order to build up current in the motor
phases, it is necessary to turn on the upper switch in one phase and
the lower switch in another phase of the inverter.
T he PWMSEG register of the ADMC330 PWM block allows
modification of the pulsewidth modulation signals from the
center-based block in order to meet the requirements for ECM
control. T hree bits of the PWMSEG register (Bits 6, 7 and 8)
permit individual crossover of the three PWM signal pairs. For
example, setting Bit 8 will crossover the signals for Phase A such
that the high-side signal from the center-based block will ulti-
mately appear at the low-side output pin (AL). Conversely, the
low-side signal from the center-based block will appear at Pin AH.
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