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SMBus/I 2 C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers
Table 8. PWM Settings on Output Ports
PWM SETTING
D7
D6
D5
REGISTER DATA
D4 D3
D2
D1
D0
Port P_ is a static logic-level low output port
Port P_ is a PWM output port; PWM duty cycle is 1/32
Port P_ is a PWM output port; PWM duty cycle is 3/32
Port P_ is a PWM output port; PWM duty cycle is 7/32
Port P_ is a PWM output port; PWM duty cycle is 15/32
Port P_ is a PWM output port; PWM duty cycle is 31/32
Port P_ is a static logic-level high output port
0
0
0
0
0
0
0
X
X
X
X
X
X
1
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
0
1
1
X
0
0
0
1
1
1
X
0
0
1
1
1
1
X
0
1
1
1
1
1
X
Table 9. Blink and PWM Frequencies
BLINK OR PWM SETTING
DEVICE CONFIGURATION
REGISTER 0x66
BIT D4 BIT D3 BIT D2
BLINK2 BLINK1 BLINK0
BLINK OR PWM
FREQUENCY (32kHz
INTERNAL OSCILLATOR)
(Hz)
BLINK OR PWM
FREQUENCY (0Hz TO 1MHz
EXTERNAL OSCILLATOR)
Blink period is 8 seconds (0.125Hz)
Blink period is 4 seconds (0.25Hz)
Blink period is 2 seconds (0.5Hz)
Blink period is 1 second (1Hz)
Blink period is a 1/2 second (2Hz)
Blink period is a 1/4 second (4Hz)
Blink period is an 1/8 second (8Hz)
Blink period is a 1/32 second (32Hz)
PWM
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
X
0.125
0.25
0.5
1
2
4
8
32
1024
OSCIN / 262,144
OSCIN / 131,072
OSCIN / 65,536
OSCIN / 32,768
OSCIN / 16,384
OSCIN / 8192
OSCIN / 4096
OSCIN / 1024
OSCIN / 32
Table 10. Blink Settings on Output Ports
BLINK SETTINGS
D7
D6
D5
REGISTER DATA
D4 D3
D2
D1
D0
Port P_ is a static logic-level low output port
Port P_ is a blinking output port; blink duty cycle is 1/16
Port P_ is a blinking output port; blink duty cycle is 3/16
Port P_ is a blinking output port; blink duty cycle is 7/16
Port P_ is a blinking output port; blink duty cycle is 15/16
Port P_ is a static logic-level high output port
0
0
0
0
0
0
X
X
X
X
X
1
1
1
1
1
1
1
0
0
0
0
0
1
0
0
0
0
1
X
0
0
0
1
1
X
0
0
1
1
1
X
0
1
1
1
1
X
X = Don’t care.
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17
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