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UM0839 数据表(PDF) 21 Page - STMicroelectronics |
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UM0839 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 32 page  UM0839 Configure L9942 graphic user interface Doc ID 16519 Rev 2 21/32 11.1.6 DAC scale (DC2, DC1, DC0) 11.1.7 NPWM 11.1.8 PWM counter (D7~D0) 11.1.9 FRE Description: These bits set full scale range of limit. Value: 95mA → 000 140mA → 001 230mA → 010 360mA → 011 550mA → 100 810mA → 101 1150mA → 110 1350mA → 111 Default: 000 SPI-DIN Bit: Register 1, bits 12, 11 and 10. Description: This bit switches internal PWM signal of bridge A to pin PWM if set to 0. Value: Internal PWM signal of bridge A switch to pin PWM → 0 Pin PWM is in high resistance status → 1 Default: 0 SPI-DIN Bit: Register 3, bit 5. Description: These bits are for threshold value in counter of active time during signal PWM. Value: 0~255 Default: 0 SPI-DIN Bit: Register 3, bits 7 and 6; Register 4, bits 7, 6 and 5; Register 5, bits 7, 6 and 5 Description: This bit sets frequency of PWM cycle. Value: PWM frequency 30 kHz → 0 PWM frequency 20 kHz → 1 Default: 0 |
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