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LM4970 データシート(PDF) 9 Page - Texas Instruments |
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LM4970 データシート(HTML) 9 Page - Texas Instruments |
9 / 19 page LM4970 www.ti.com SNVS312D – JANUARY 2005 – REVISED MAY 2013 Table 4. Frequency Select Register Default Data Bit Bit Name Condition Function Value Programs the oscillation frequency of the PWM. PWM oscillation frequency is 0 set as follows: FSO PWM_FO 0 1 PWM_F<1:0> PWM Frequency 00 15kHz 0 01 60Hz FS1 PWM_F1 0 10 7Hz 1 11 4Hz 0 FS2 RSVD 0 RESERVED 1 0 Programs the internal high pass filter cutoff frequency. High pass filter cutoff FS3 HPF_FO 0 frequency is set as follows: 1 0 HPF_F<1:0> High Pass Filter Cutoff Frequency 00 3.5kHz FS4 HPF_F1 1 01 6.3kHz 1 10 6.3kHz 11 8.9kHz Table 5. Pattern Select Register Data Bit Bit Name Default Value Condition Function Enables LED drivers to be controlled by audio 0 synchronization PSO I2C_SEL 0 1 Enables LED drivers to be controlled through I2C 0 Disables the LED1 driver, if I2C_SEL is set PS1 I2C_LED1 0 1 Enables the LED1 driver, if I2C_SEL is set 0 Disables the LED2 driver, if I2C_SEL is set PS2 I2C_LED2 0 1 Enables the LED2 driver, if I2C_SEL is set 0 Disables the LED3 driver, if I2C_SEL is set PS3 I2C_LED3 0 1 Enables the LED3 driver, if I2C_SEL is set 0 RESERVED PS4 RSVD 0 1 RESERVED Table 6. Current Select Register Default Data Bit Bit Name Condition Function Value Programs the current drive of the LED1 driver. Current drive for LED1 is set 0 as follows: CSO ILED1_0 0 1 ILED1<1:0> Current Drive Setting 00 0.66X 0 01 1X CS1 ILED1_1 1 10 1.33X 1 11 2X Programs the current drive of the LED2 driver. Current drive for LED2 is set 0 as follows: CS2 ILED2_0 0 1 ILED2<1:0> Current Drive Setting 00 0.66X 0 01 1X CS3 ILED2_1 1 10 1.33X 1 11 2X Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM4970 |
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