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PCA9553TK Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9553TK Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 26 page PCA9553_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 29 December 2008 7 of 26 NXP Semiconductors PCA9553 4-bit I2C-bus LED driver with programmable blink rates 7.3.4 PSC1 - Frequency Prescaler 1 PSC1 is used to program the period of the PWM output. The period of BLINK1 = (PSC1 + 1) / 44. 7.3.5 PWM1 - Pulse Width Modulation 1 The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED off) when the count is less than the value in PWM1 and HIGH when it is greater. If PWM1 is programmed with 00h, then the PWM1 output is always LOW. The duty cycle of BLINK1 = (256 − PWM1) / 256. 7.3.6 LS0 - LED selector register The LS0 LED select register determines the source of the LED data. 00 = output is set LOW (LED on) 01 = output is set high-impedance (LED off; default) 10 = output blinks at PWM0 rate 11 = output blinks at PWM1 rate Table 8. PSC1 - Frequency Prescaler 1 register description Bit 7 6 5 4 3 2 1 0 Symbol PSC1[7] PSC1[6] PSC1[5] PSC1[4] PSC1[3] PSC1[2] PSC1[1] PSC1[0] Default 11111111 Table 9. PWM1 - Pulse Width Modulation 1 register description Bit 7 6 5 4 3 2 1 0 Symbol PWM1 [7] PWM1 [6] PWM1 [5] PWM1 [4] PWM1 [3] PWM1 [2] PWM1 [1] PWM1 [0] Default 10000000 Table 10. LS0 - LED selector register bit description Legend: * default value. Register Bit Value Description LS0 - LED0 to LED3 selector LS0 7:6 01* LED3 selected 5:4 01* LED2 selected 3:2 01* LED1 selected 1:0 01* LED0 selected |
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