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CAT9532HV6I-G Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT9532HV6I-G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 18 page CAT9532 The Input Register 0 and Input Register 1 reflect the incoming logic levels of the I/O pins, regardless of whether the pin is defined as an input or an output. These registers are read only ports. Writes to the input registers will be acknowledged but will have no effect. Table 2. Input Register 0 and Input Register 1 INPUT0 LED 7 LED 6 LED 5 LED 4 LED 3 LED 2 LED 1 LED 0 bit 7 6 5 4 3 2 1 0 default X X X X X X X X INPUT1 LED 15 LED 14 LED 13 LED 12 LED 11 LED 10 LED 9 LED 8 bit 7 6 5 4 3 2 1 0 default X X X X X X X X The Frequency Prescaler 0 and Frequency Prescaler 1 registers (PSC0, PSC1) are used to program the period of the pulse width modulated signals BLINK0 and BLINK1 respectively: T_BLINK0 = (PSC0 + 1) / 152; T_BLINK1 = (PSC1 + 1) / 152 Table 3. Frequency Prescaler 0 and Frequency Prescaler 1 Registers PSC0 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 PSC1 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 The PWM Register 0 and PWM Register 1 (PWM0, PWM1) are used to program the duty cycle of BLINK0 and BLINK1 respectively: Duty Cycle_BLINK0 = PWM0 / 256; Duty Cycle_BLINK1 = PWM1 / 256 After writing to the PWM0/1 register an 8-bit internal counter starts to count from 0 to 255. The outputs are low (LED on) when the counter value is less than the value programmed into PWM register. The LED is off when the counter value is higher than the value written into PWM register. Table 4. PWM Register 0 and PWM Register 1 PWM0 bit 7 6 5 4 3 2 1 0 default 1 0 0 0 0 0 0 0 PWM1 bit 7 6 5 4 3 2 1 0 default 1 0 0 0 0 0 0 0 Every LED driver output can be programmed to one of four states, LED OFF, LED ON, LED blinks at BLINK0 rate and LED blinks at BLINK1 rate using the LED Selector Registers (Table 5). Table 5. LED Selector Registers LS0 LED 3 LED 2 LED 1 LED 0 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 LS1 LED 7 LED 6 LED 5 LED 4 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 LS2 LED 11 LED 10 LED 9 LED 8 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 LS3 LED 15 LED 14 LED 13 LED 12 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 0 0 0 0 The LED output (LED0 to LED15) is set by the 2 bits value from the corresponding LSx Register (x = 0 to 3): 00 = LED Output set Hi-Z (LED Off – Default) 01 = LED Output set LOW (LED On) 10 = LED Output blinks at BLINK0 Rate 11 = LED Output blinks at BLINK1 Rate © 2010 SCILLC. All rights reserved 9 Doc. No. MD-9001 Rev. E Characteristics subject to change without notice |
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