SC620

14

Register Map

SC620 Slave Address

Following a start condition, the bus master outputs the

address of the slave device. The 7 bit slave address for the

SC620 is 1110 000x. The eighth bit is the data direction bit

and also the least significant bit (LSB). E0h is used for a

write operation, and E1h is used for a read operation.

DEVICE ADDRESS

R/W

1110000

1/0

Dimming Control Register Description

The dimming control registers set the multiplier used to

determine the absolute current setting. Current setting for

each current sink is determined by multiplying the current

step size (as described in Table 1) by the decimal multiplier

in each dimming control register. For example, if the

current step size is set to 500μA and the L1 Dimming

Control Register bits (L1_5 through L1_0) are set to 010100

(20 decimal), then the output current for ILED1 is set to 20

x 500μA = 10mA. Note that the maximum current setting

occurs when the dimming control register bits are set to

110010 (50 decimal) - any bit combination larger than this

one will default to the maximum setting.

Address

D7

D6

D5

D4

D3

D2

D1

D0

Description

00h

L8_EN

1 = on

0 = off

L7_EN

1 = on

0 = off

L6_EN

1 = on

0 = off

L5_EN

1 = on

0 = off

L4_EN

1 = on

0 = off

L3_EN

1 = on

0 = off

L2_EN

1 = on

0 = off

L1_EN

1 = on

0 = off

LED on/off control

00h

01h

X

X

L1_5

L1_4

L1_3

L1_2

L1_1

L1_0

LED1 dimming control

01h

02h

XX

L2_5

L2_4

L2_3

L2_2

L2_1

L2_0

LED2 dimming control

01h

03h

XX

L3_5

L3_4

L3_3

L3_2

L3_1

L3_0

LED3 dimming control

01h

04h

XX

L4_5

L4_4

L4_3

L4_2

L4_1

L4_0

LED4 dimming control

01h

05h

XX

L5_5

L5_4

L5_3

L5_2

L5_1

L5_0

LED5 dimming control

01h

06h

XX

L6_5

L6_4

L6_3

L6_2

L6_1

L6_0

LED6 dimming control

01h

07h

XX

L7_5

L7_4

L7_3

L7_2

L7_1

L7_0

LED7 dimming control

01h

08h

XX

L8_5

L8_4

L8_3

L8_2

L8_1

L8_0

LED8 dimming control

01h

09h

XX

X

X

G4

G3

G2

G1

gain register

08h

Note

(1) Default value is the register contents immediately following a high transition at the enable pin.

Table 1 - Gain Setting Values (default = 1000)

G4

G3

G2

G1

Current Step

Size (μA)

0000

31.25

0001

62.5

0010

93.75

0011

125

0100

156.25

0101

187.5

0110

218.75

0111

250

1000

281.25

1001

312.5

1010

343.75

1011

375

1100

406.25

1101

437.5

1110

468.75

1111

500