LP5523 datasheet(32/56 Pages) TI1

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LP5523

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

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3C VARIABLE

•

3C — Bits [7:0] VARIABLE

–

These bits are used for storing a global 8-bit variable. Variable can be used to control program flow.

3D RESET

•

3D — Bits [7:0] RESET

–

Writing 11111111 into this register resets the LP5523. Internal registers are reset to the default values.

Reading RESET register returns 00000000.

3E TEMP ADC CONTROL

•

3E — Bit [7] TEMP_MEAS_BUSY

–

1 = temperature measurement active.

–

0 = temperature measurement done or not activated.

•

3E — Bit [2] EN_TEMP_SENSOR

–

1 = enables internal temperature sensor. Every time when EN_TEMP_SENSOR is written high a new

measurement period is started. The length of the measurement period depends on temperature. At 25°C a

measurement takes 20 milliseconds. Temperature can be read from register 3F.

–

0 = temp sensor disabled.

•

3E — Bit [1] CONTINUOUS _CONV

–

This bit is effective when EN_TEMP_SENSOR = 1.

–

1 = continuous temperature measurement. Not active when the device is in power save.

–

0 = new temperature measurement period initiated during startup or after exit from power-save mode.

3E — Bit [0] SEL_EXT_TEMP

•

1 = temperature compensation source register addr 40H.

–

0 = temperature compensation source register addr 3FH.

3F TEMPERATURE READ

•

3F — Bits [7:0] TEMPERATURE

–

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.

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