LP55231 datasheet(34/53 Pages) TI

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LP55231

SNOSCR5 – MARCH 2013

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•

These bits are used for storing an 8-bit temperature reading acquired from the internal temperature sensor.

This register is a read-only register. Temperature reading is stored in 8-bit two's complement format — see

the table below.

TEMPERATURE READ bits

Temperature interpretation (typ.) °C

11010111

−41

11011000

−40

...

11111110

−2

11111111

−1

00000000

00000001

00000010

...

01011000

01011001

40 TEMPERATURE WRITE

•

40 — Bits [7:0] TEMPERATURE

•

These bits are used for storing an 8-bit temperature reading acquired from an external sensor, if such a

sensor is used. Temperature reading is stored in 8-bit two's complement format, like in 3F TEMPERATURE

READ register.

•

When writing temperature data outside the range of the temperature compensation: Values greater than 89°C

will be set to 89°C; values less than

−39°C will be set to −39°C.

41 LED TEST CONTROL

•

LED test control register

•

41 — Bit [7] EN_LEDTEST_ADC

•

Writing this bit high (1) fires single LED test conversion. LED test measurement cycle is 2.7 milliseconds.

•

41 — Bit [6] EN_LEDTEST_INT

•

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

•

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

•

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

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41 — Bit [5] CONTINUOUS_CONV

•

1 = continuous LED test measurement. Not active in power-save 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 be measured, also.

LED_TEST_CTRL bits

Measurement

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001 to 01110

Reserved

01111

VOUT

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