LP8501 datasheet(42/51 Pages) TI1

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140

190

RESULT (DEC)

LP8501

SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 2013

www.ti.com

Figure 30.

48 GROUP FADER1

•

48 — Bits [7:0] GROUP_FADER

–

An 8-bit register to control all the LED-drivers mapped to GROUP FADER1. Group fader allows the user

to control dimming of multiple LEDs with a single serial bus write. This is a faster method to control the

dimming of multiple LEDs compared to the dimming done with the PWM registers (address 16h to 1Eh),

which would need multiple writes.

49 GROUP FADER2

•

49 — Bits [7:0] GROUP_FADER

–

See GROUP FADER1 description.

4A GROUP FADER3

•

4A — Bits [7:0]GROUP_FADER

–

See GROUP FADER1 description.

4C ENGINE1 PROG START ADDR

•

Program memory allocation for program execution engines is defined with PROG START ADDR registers.

•

4C — Bits [6:0] — ADDR

–

Engine 1 program start address.

4D ENG2 PROG START ADDR

•

4D — Bits [6:0] — ADDR

–

Engine 2 program start address.

4E ENG3 PROG START ADDR

•

4E — Bits [6:0] — ADDR

–

Engine 3 program start address.

4F PROG MEM PAGE SELECT

•

4F — Bits [2:0] — PAGE_SEL

–

These bits select the program memory page. The program memory is divided into six pages of 16

instructions; thus the total amount of the program memory is 96 instructions.

76 — GAIN CHANGE CONTROL

Note that these controls have effect only in automatic mode.

•

76 — Bits [7:6] — THRESHOLD

–

Threshold voltage (typ.) pre-setting. Bits set the threshold voltage at which the charge pump gain changes

from 1.5x to 1x. The threshold voltage is defined as the voltage difference between highest voltage output

(D1 to D6) and input voltage VDD : VTHRESHOLD = VDD — MAX (voltage on D1 to D6).

–

If VTHRESHOLD is larger than the set value (100 mV to 400 mV), the charge pump is in 1x mode.

–

00 = 400 mV

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