AN4460 datasheet(32/54 Pages) STMICROELECTRONICS

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User interface

AN4460

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DocID026129 Rev 1

7.4.5

au - adaptive voltage compensation

The adaptive voltage compensation (control loop) is used to calculate the new PWM

parameters in relation to the voltage read by the VCOMx or VLED_PW. When the adaptive

voltage compensation is OFF (“au x 0"), the voltage compensation simulation mode is

enabled and the commands vp and vc become available. The value is stored into the

E2PROM data area and applies to next power-on.

Syntax: au [ch] [enable]

Parameters:



ch [0-3]: channel number



enable [0,1]: enables (1) or disables (0) the adaptive voltage compensation.

Output: none

7.4.6

st - verify status

The command reports the STLUX385A status.

Syntax: st

Parameters: none

Output: an example of the output is shown:

Figure 11. “st” command

The first line reports the last error [err=] and the total number of errors found [cnt=] by the

FW. The [di=] field reports the “ed” status [0 or 1] and the “di” global dimming percentage

(from 0% to 100%). It also reports, for each channel [ch], the channel activation or

deactivation [on or off], the automatic loop status [l=1 or l=0], the dimming level [d=010], the

number of LEDs, the current index and the VLED_PW and VCOMx voltages when the dimming

is ON. The voltage data (VLED_PW and VCOMx) is the raw data read from the ADC. Multiply

by 0.05437489 to convert into a voltage.

7.4.7

pw - PWM status

Syntax: pw [ch]

Parameters:



ch [0-3]: channel number

Output:



Retrieves the TIM_Cnt values configured in the [ch] channel. The command “pw 0"

output is shown in Figure 12:

Status: err=0 cnt=0

di=1:050

Led ch=0 on l=1

d=010 led=6 cur=0

Vpw=432 Vcom=80 OVC=off

Led ch=1 on l=1

d=020 led=6 cur=3

Vpw=432 Vcom=89 OVC=off

Led ch=2 on l=1

d=210 led=6 cur= 2

Vpw=429 Vcom=91 OVC=off

Led ch=3 on l=1

d=0 55 led=6 cur= 1

Vpw=430 Vcom=94 OVC=off

AM16711v1

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