LP8501 datasheet(41/51 Pages) TI1

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LP8501

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SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 2013

•

3D — Bits [7:0] RESET

–

Writing 11111111 into this register resets the LP8501. Internal registers are reset to the default values.

Reading RESET register returns 00000000.

41 LED TEST CONTROL

•

LED test control register

•

41 — Bit [7] EN_LEDTEST_ADC

–

Writing this bit high (1) starts single LED test conversation. LED test measurement cycle is 2.7

milliseconds.

•

41 — Bit [6] EN_LEDTEST_INT

–

1 = interrupt signal will be send to the INT pin when the LED test is accomplished.

–

0 = no interrupt signal will be send to the INT pin when the LED test is accomplished.

–

Interrupt can be cleared by reading STATUS/INTERRUPT register 3Ah.

•

41 — Bit [5] CONTINUOUS_CONV

–

1 = Continuous LED test measurement. Not active in powersave mode.

–

0 = Continuous conversion is disabled.

•

41 — Bits [4:0] LED__TEST_CTRL

–

These bits are used for choosing the LED driver output to be measured. VDD, INT-pin and charge-pump

output voltage can also be measured.

LED_TEST_CTRL bits

Measurement

00000

00001

00010

00011

00100

00101

00110

000111

01000

01001 to 01110

Reserved

01111

VOUT

10000

VDD

10001

INT-pin voltage

10010

VDD1_6

10011

VDD7_9

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 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

Figure 30 below.

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