List of External Components

Symbol

Symbol Explanation

Value

Unit

Recommended Type

C

VDD1

V

100

nF

Ceramic, X7R

C

VDD2

V

100

nF

Ceramic, X7R

C

OUT

Output Capacitor from FB to GND

10

µF

Ceramic, X7R/Y5V

C

IN

Input Capacitor from Battery Voltage to GND

10

µF

Ceramic, X7R/Y5V

C

VDDIO

V

100

nF

Ceramic, X7R

RT

Oscillator Frequency Bias Resistor

82

k

Ω

1% (Note 15)

RSO

SO Output Pull-up Resistor

100

k

Ω

C

VREF

Reference Voltage Capacitor, between V

100

nF

Ceramic, X7R

L

BOOST

Boost Converter Inductor

10

µH

Shielded, Low ESR, I

SAT

∼1A

D

OUT

Rectifying Diode, V

0.3

V

Schottky Diode

RGB1

RGB LED1

User Defined

(See Application Note AN-1291 for resistor size calculation)

RGB2

RGB LED2

R

Current Limit Resistor

R

Current Limit Resistor

LEDs

White LEDs

Note 15: Resistor RT accuracy specification change from 1%

→ 5% will be seen on timing accuracy of RGB block. Also the boost converter’s switching frequency

will be affected.

Control Registers

Control registers and register bits are shown in the following table.

ADDR

REGISTER

D7

D6

D5

D4

D3

D2

D1

D0

00H

RGB Control register1

rgb pwm

rgb start

rsw1

gsw1

bsw1

rsw2

gsw2

bsw2

01H

red1_on_off

r1_on[3]

r1_on[2]

r1_on[1]

r1_on[0]

r1_off[3]

r1_off[2]

r1_off[1]

r1_off[0]

02H

green1_on_off

g1_on[3]

g1_on[2]

g1_on[1]

g1_on[0]

g1_off[3]

g1_off[2]

g1_off[1]

g1_off[0]

03H

blue1_on_off

b1_on[3]

b1_on[2]

b1_on[1]

b1_on[0]

b1_off[3]

b1_off[2]

b1_off[1]

b1_off[0]

04H

r1slope, r1duty

r1slope[3]

r1slope[2]

r1slope[1]

r1slope[0]

r1duty[3]

r1duty[2]

r1duty[1]

r1duty[0]

05H

g1slope, g1duty

g1slope[3]

g1slope[2]

g1slope[1]

g1slope[0]

g1duty[3]

g1duty[2]

g1duty[1]

g1duty[0]

06H

b1slope, b1duty

b1slope[3]

b1slope[2]

b1slope[1]

b1slope[0]

b1duty[3]

b1duty[2]

b1duty[1]

b1duty[0]

07H

RGB Control register2

cycle[1]

cycle[0]

r1_pwm

g1_pwm

b1_pwm

r2_pwm

g2_pwm

b2_pwm

0BH

enables

nstby

en_boost

en_flash1

en_flash2

0DH

boost output

boost[7]

boost[6]

boost[5]

boost[4]

boost[3]

boost[2]

boost[1]

boost[0]

2AH

red2_on_off

r2_on[3]

r2_on[2]

r2_on[1]

r2_on[0]

r2_off[3]

r2_off[2]

r2_off[1]

r2_off[0]

2BH

green2_on_off

g2_on[3]

g2_on[2]

g2_on[1]

g2_on[0]

g2_off[3]

g2_off[2]

g2_off[1]

g2_off[0]

2CH

blue2_on_off

b2_on[3]

b2_on[2]

b2_on[1]

b2_on[0]

b2_off[3]

b2_off[2]

b2_off[1]

b2_off[0]

2DH

r2slope, r2duty

r2slope[3]

r2slope[2]

r2slope[1]

r2slope[0]

r2duty[3]

r2duty[2]

r2duty[1]

r2duty[0]

2EH

g2slope, g2duty

g2slope[3]

g2slope[2]

g2slope[1]

g2slope[0]

g2duty[3]

g2duty[2]

g2duty[1]

g2duty[0]

2FH

b2slope, b2duty

b2slope[3]

b2slope[2]

b2slope[1]

b2slope[0]

b2duty[3]

b2duty[2]

b2duty[1]

b2duty[0]

Default value of each register is 0000 0000 except boost output which is 0011 1111 (5V).

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