IW7032 datasheet(21/31 Pages) DIALOG

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iW7032

32-Channel LED Driver for LCD Panel Backlighting

Rev. 1.3

iW7032

Page 21

Definition

Access

Description

Initial One-Time Update Control Registers (cont’d)

bg_cfg

R/W

The number of LED channels in one Boost/Buck Group

0: 16 LED channels in one Boost/Buck Group (default)

1: 17 - 32 LED channels in one Boost/Buck Group

lu_c0[9:0]

lu_c1[11:0]

R/W

The 1st (2 term) order LED current to luminance nonlinear transfer function

coefficient.

The transfer function is:

( )

Lum Flux I

C I

lu_c0 default: 57; lu_c1 default: 1461

Status Registers

led_short

Status bit for the 32 LED channels. If any LED pin has a voltage higher than 5.5v,

this means two or more LEDs in this LED string have been shorted together. The

led_short bit will be set and the corresponding LED driver will then be disabled.

led_short_idx[4:0]

The latest shorted LED channel index

led_open

Status bit for the 32 LED channels. While iW7032 is working, if some LED string

is suddenly open and its corresponding LED driver senses no current at all, the

led_open bit will be set and the LED driver will be disabled instead of requesting

higher voltage from Boost/Buck.

led_open_idx[4:0]

The latest open LED channel index

Status bit if over temperature fault happens.

init_done

Status bit for IC initialization is done; software starts to program the initial one-

time control registers to configure the IC.

cali_done

Status bit for IC calibration is done; software starts to program the 32-channel

real-time registers

ch_en[31:0]

Status bit for each of the 32 LED channels. It is used to flag if any LED channel

is either enabled (1) or disabled (0) from fault detections.

Idac1[3:0] : Idac32[3:0]

4-bit current DAC value for each LED channels

vdac1[7:0]

8-bit Boost/Buck voltage DAC value for the first external Boost/Buck converter

vdac2[7:0]

8-bit Boost/Buck voltage DAC value for the second external Boost/Buck converter

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