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LP3944ISQX Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LP3944ISQX Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Application Notes (Continued) TABLE 1. LP3944 REGISTER TABLE Address (Hex) Register Name Read/Write Register Function 0x00 Input 1 Read Only LED0–7 Input Register 0x01 Register 1 Read Only None 0x02 PSC0 R/W Frequency Prescaler 0 0x03 PWM0 R/W PWM Register 0 0x04 PSC1 R/W Frequency Prescaler 1 0x05 PWM1 R/W PWM Register 1 0x06 LS0 R/W LED0–3 Selector 0x07 LS1 R/W LED4–7 Selector 0x08 Register 8 R/W None 0x09 Register 9 R/W None Note: Registers 1, 8 and 9 are empty and non-functional registers. Register 1 is read-only, with all bits hard-wired to zero. Registers 8 and 9 can be written and read, but the content does ot have any effect on the operation of the LP3944. BINARY FOMAT FOR INPUT REGISTERS (READ ONLY) — ADDRESS 0x00 and 0x01 Address 0x00 Bit # 76543210 Default value XXXXXXXX LED7 LED6 LED5 LED4 LED3 LED2 LED1 LED0 X = don’t care BINARY FORMAT FOR FREQUENCY PRESCALER AND PWM REGISTERS — ADDRESS 0x02 to 0x05 Address 0x02 (PSC0) Bit # 76543210 Default value 00000000 PSC0 register is used to program the period of DIM0. DIM0 = (PSC0+1)/160 The maximum period is 1.6s when PSC0 = 255. Address 0x03 (PWM0) Bit # 76543210 Default value 10000000 PWM0 register determines the duty cycle of DIM0. The LED outputs are LOW (LED on) when the count is less than the value in PWM0 and HIGH (LED off) when it is greater. If PWM0 is programmed with 0x00, LED output is always HIGH (LED off). The duty cycle of DIM0 is: PWM0/256 Default value is 50% duty cycle. Address 0x04 (PSC1) Bit # 76543210 Default value 00000000 PSC1 register is used to program the period of DIM1. DIM1 = (PSC1 + 1)/160 The maximum period is 1.6s when PSC1 = 255. www.national.com 9 |
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