Datasheet
White LED, PWM Drivers — I
2
C Registers
TPS65820
SLVS663B – MAY 2006 – REVISED APRIL 2008 ..............................................................................................................................................................
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The I
2
C registers that control LED AND PWM driver related functions are shown below. The HEX address for
each register is shown by the register name, together with the R or W functionality for the register bits. Shaded
values indicate default initial power-up values. In the equations replace Bn with 1 for HI state, and 0 for LO state.
B7 B6 B5 B4 B3 B2 B1 B0
SM3_SET, ADDRESS=16, ALL BITS R/W
Bit Name SM3_I7 set SM3_I6 set SM3_I5 set SM3_I4 set SM3_I3 set SM3_I2 set SM3_I1 set SM3_I0 set
Function SM3 DUTY CYCLE CONTROL
Value See Table 13 for SM3 duty cycle settings, default = 0 (OFF)
RGB_FLASH, ADDRESS= 17, ALL BITS R/W
Bit Name FLASH_EN FLASH_ON2 FLASH_ON1 FLASH_ON0 FLASH_PER3 FLASH_PER2 FLASH_PER1 FLASH_PER0
Function FLASH MODE FLASH MODE ON TIME FLASH MODE PERIOD
ON/OFF CTRL
When 0 OFF See Table 14 for RGB ON TIME settings, default = See Table 14 for RGB FLASH settings, default = 1
0.1
When 1 ON
RGB_RED, ADDRESS=18, ALL BITS R/W
Bit Name RGB_ISET1 RGB_ISET0 PHASE PWMR_D4 PWMR_D3 PWMR_D2 PWMR_D1 PWMR_D0
Function RGB LED CURRENT SETTINGS PHASE REG DRIVER DUTY CYCLE CONTROL
CONTROL
When 0 00 = 0 10 = 8 mA GREEN out of See Table 14 for RGB_RED DUTY settings, default = 0
01 = 4 mA 11 = 12 mA Φ with RED
and BLUE
When 1 BLUE out of Φ
with RED and
GREEN
RGB_GREEN, ADDRESS=19, ALL BITS R/W
Bit Name NOT USED NOT USED NOT USED PWMG_D4 PWMG_D3 PWMG_D2 PWMG_D1 PWMG_D0
Function NOT USED NOT USED NOT USED GREEN DRIVER DUTY CYCLE CONTROL
Value NOT USED NOT USED NOT USED See Table 14 for RGB_GREEN DUTY settings, default = 0
RGB_BLUE, ADDRESS=1A, ALL BITS R/W
Bit Name NOT USED NOT USED NOT USED PWMB_D4 PWMB_D3 PWMB_D2 PWMB_D1 PWMB_D0
Function NOT USED NOT USED NOT USED BLUE DRIVER DUTY CYCLE CONTROL
Value NOT USED NOT USED NOT USED See Table 14 for RGB_BLUE DUTY settings, default = 0
PWM, ADDRESS=1D, ALL BITS R/W
Bit Name PWM_EN PWM1_F2 PWM_F1 PWM_F0 PWM_D3 PWM_D2 PWM_D1 PWM_D0
Function PWM ON/OFF PWM DRIVER FREQUENCY SETTINGS PWM DRIVER DUTY CYCLE SETTINGS
CONTROL
When 0 Disabled 000 = 15.6 kHz 011 = 3 kHz 110 = 1 kHz See Table 15 for PWM DUTY settings, default = 0.0625
001 = 7.8 kHz 100 = 2 kHz 111 = 500 Hz
When 1 Enabled
010 = 4.5 kHz 101 = 1.5 kHz Default = 15.6
kHz
LED_PWM, ADDRESS=27, ALL BITS R/W
Bit Name LPWM_7 set LPWM_6 set LPWM_5 set LPWM_4 set LPWM_3 set LPWM_2 set LPWM_1 set LPWM_0 set
Function LED_PWM DRIVER DUTY CYCLE CONTROL
Value See Table 13 for LED_PWM DUTY settings, default = 0 (OFF)
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