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PCA9553TK Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9553TK Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 26 page PCA9553_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 29 December 2008 6 of 26 NXP Semiconductors PCA9553 4-bit I2C-bus LED driver with programmable blink rates 7.3 Register descriptions 7.3.1 INPUT - Input register The INPUT register reflects the state of the device pins. Writes to this register will be acknowledged but will have no effect. Remark: The default value ‘X’ is determined by the externally applied logic level (normally logic 1) when used for directly driving LED with pull-up to VDD. 7.3.2 PSC0 - Frequency Prescaler 0 PSC0 is used to program the period of the PWM output. The period of BLINK0 = (PSC0 + 1) / 44. 7.3.3 PWM0 - Pulse Width Modulation 0 The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off) when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is programmed with 00h, then the PWM0 output is always LOW. The duty cycle of BLINK0 = (256 − PWM0) / 256. Table 4. Control register definition B2 B1 B0 Register name Type Register function 0 0 0 INPUT read input register 0 0 1 PSC0 read/write frequency prescaler 0 0 1 0 PWM0 read/write PWM register 0 0 1 1 PSC1 read/write frequency prescaler 1 1 0 0 PWM1 read/write PWM register 1 1 0 1 LS0 read/write LED selector Table 5. INPUT - Input register description Bit 7 6 5 4 3 2 1 0 Symbol INPUT[7] INPUT[6] INPUT[5] INPUT[4] LED3 LED2 LED1 LED0 Default 0 0 0 0 XXXX Table 6. PSC0 - Frequency Prescaler 0 register description Bit 7 6 5 4 3 2 1 0 Symbol PSC0[7] PSC0[6] PSC0[5] PSC0[4] PSC0[3] PSC0[2] PSC0[1] PSC0[0] Default 11111111 Table 7. PWM0 - Pulse Width Modulation 0 register description Bit 7 6 5 4 3 2 1 0 Symbol PWM0 [7] PWM0 [6] PWM0 [5] PWM0 [4] PWM0 [3] PWM0 [2] PWM0 [1] PWM0 [0] Default 10000000 |
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