16-Channel Constant Current LED Driver with Error Detection

Version:A.004

Page 12

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DM13H

CD Mode Data Format

a. Global Brightness Control

DM13H offers a convenient way to fine tune the whole chip output currents for the

uniformity of brightness between modules, ICs or the accomodation to ambient light. To

further adjust the current level linearly, the system shall enter the CD MODE and then shift

in 7-bit GBC data code through DAI pin. The MSB should be shifted-in first. Take the input

code. G[6:0]= (MSB)1001011(LSB) for example. The new current is then equal to the base

current multiplied by the ratio

128

1)

2

2

2

2

(

0

1

3

6

+

+

+

+

. The 7-bit data won’t be changed until the

next new data is latched. Note that the default code 7’b1000000 exists in chip memory

when power on, so the output current is equal to the half of base current.

b. Short detection voltage level selection

DM13H provides 2 voltage levels in coordination with LED short detection on system.

VCC voltage level is the default value while power-on. DAO will send an error signal = H if

the output voltage is greater than a respectively predetermined threshold value.

SV

Short Voltage

0

5/6 * VCC

1

VCC (default)

c. Sleep mode

When SLP=1, DM13H will enter sleep mode, all outputs turn off and the IDD of DM13H

will drop down to less than 5uA. This function is especially designed for battery or solar

powered system.