LP55231 datasheet(35/53 Pages) TI

35 / 53 page

140

190

RESULT (DEC)

LP55231

www.ti.com

SNOSCR5 – MARCH 2013

LED_TEST_CTRL bits

Measurement

10000

VDD

10001

INT-pin voltage

10010 to 11111

N/A

42 LED TEST ADC

•

42 — Bits [7:0] LED_TEST_ADC

•

This is used to store the LED test result. Read-only register. LED test ADC's least significant bit corresponds

to 30 mV. The measured voltage V (typ.) is calculated as follows: V = (RESULT(DEC) x 0.03 - 1.478 V. For

example, if the result is 10100110 = 166(DEC), the measured voltage is 3.50V (typ.). See the figure below.

Figure 25. LED Test Results vs. Measured Voltage

45 ENGINE1 VARIABLE A

•

45 — Bits [7:0] VARIABLE FOR ENGINE1

•

These bits are used for Engine 1 local variable. Read-only register.

46 ENGINE2 VARIABLE A

•

46 — Bits [7:0] VARIABLE FOR ENGINE2

•

These bits are used for Engine 2 local variable. Read-only register.

47 ENGINE3 VARIABLE A

•

47 — Bits [7:0] VARIABLE FOR ENGINE3

•

These bits are used for Engine 3 local variable. Read-only register.

48 MASTER FADER1

•

48 — Bits [7:0] MASTER_FADER

•

An 8-bit register to control all the LED-drivers mapped to MASTER FADER1. Master 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 MASTER FADER2

•

49 — Bits [7:0] MASTER_FADER

•

An 8-bit register to control all the LED-drivers mapped to MASTER FADER2. See MASTER FADER1

description.

4A MASTER FADER3

•

4A — Bits [7:0] MASTER_FADER

•

An 8-bit register to control all the LED-drivers mapped to MASTER FADER3. See MASTER FADER1

description.

4C ENG1 PROG START ADDR

•

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

•

4C — Bits [6:0] — ADDR

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