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PCA9532 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9532 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 20 page PCA9532_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 17 March 2009 6 of 29 NXP Semiconductors PCA9532 16-bit I2C-bus LED dimmer 6.2.1 Control register definition 6.3 Register descriptions 6.3.1 INPUT0 - Input register 0 The INPUT0 register reflects the state of the device pins (inputs 0 to 7). 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. 6.3.2 INPUT1 - Input register 1 The INPUT1 register reflects the state of the device pins (inputs 8 to 15). 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. Table 3. Register summary B3 B2 B1 B0 Symbol Access Description 0000 INPUT0 read only input register 0 0001 INPUT1 read only input register 1 0010 PSC0 read/write frequency prescaler 0 0011 PWM0 read/write PWM register 0 0100 PSC1 read/write frequency prescaler 1 0101 PWM1 read/write PWM register 1 0110LS0 read/write LED0 to LED3 selector 0111LS1 read/write LED4 to LED7 selector 1000LS2 read/write LED8 to LED11 selector 1001LS3 read/write LED12 to LED15 selector Table 4. INPUT0 - Input register 0 description Bit 7 6 5 4 3 2 1 0 Symbol LED7 LED6 LED5 LED4 LED3 LED2 LED1 LED0 Default XXXXXXXX Table 5. INPUT1 - Input register 1 description Bit 7 6 5 4 3 2 1 0 Symbol LED15 LED14 LED13 LED12 LED11 LED10 LED9 LED8 Default XXXXXXXX |
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