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SMBus/I 2 C Interfaced 9-Port,
Level-Translating GPIO and LED Driver with CLA
PORT
REGISTER
VALUE
0b0X000000
0b0X000001
0b0X000010
0b0X000011
0b0X011101
0b0X011110
0b0X011111
0b0111XXXX
977 μ s NOMINAL PWM PERIOD (1024Hz PERIOD)
OUTPUT STATIC LOW (STATIC LOGIC-LOW OUTPUT OR LED DRIVE ON)
OUTPUT LOW 1/32 DUTY PWM
OUTPUT LOW 2/32 DUTY PWM
OUTPUT LOW 3/32 DUTY PWM
OUTPUT LOW 29/32 DUTY PWM
OUTPUT LOW 30/32 DUTY PWM
OUTPUT LOW 31/32 DUTY PWM
OUTPUT STATIC HIGH (STATIC LOGIC-HIGH OUTPUT OR LED DRIVE OFF)
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
HIGH-Z
LOW
Figure 6. Static and PWM Port Output Waveforms
977 μ s NOMINAL PWM PERIOD
NEXT PWM PERIOD
NEXT PWM PERIOD
0
1
2
3 4 5 6 7 8
OUTPUT P8
OUTPUTS P1, P9
OUTPUT P2
OUTPUT P3
OUTPUT P8
OUTPUTS P1, P9
OUTPUT P2
OUTPUTP3
OUTPUT P8
OUTPUTS P1, P9
OUTPUT P2
OUTPUT P3
OUTPUT P4
OUTPUT P5
OUTPUT P6
OUTPUT P7
Figure 7. Staggered PWM Phasing Between Port Outputs
OUTPUT P4
OUTPUT P5
OUTPUT P6
OUTPUT P7
16
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