LP55231 datasheet(33/53 Pages) TI

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LP55231

www.ti.com

SNOSCR5 – MARCH 2013

"1".

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1 = at least one of the engines is clearing internal registers.

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0 = engine ready.

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3A — Bit [3] EXT_CLK_USED

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1 = external clock detected.

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0 = external clock not detected.

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This bit is high when external clock signal on CLK pin is detected. CLK_DET_EN bit high in address 36

enables the clock detection.

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3A — Bits [2:0] ENG1_INT, ENG2_INT, ENG3_INT

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1 = interrupt set.

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0 = interrupt unset/cleared.

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Interrupt bits for program execution engine 1, 2 and 3, respectively. These bits are set by END or INT

instruction. Reading the interrupt bit clears the interrupt.

3B INT/GPO

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INT pin can be configured to function as a GPO by setting the bit INT_CONF. When INT is configured to

function as a GPO, output level is defined by the VDD voltage.

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3B — Bit [2] INT_CONF

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0 = INT pin is set to function as an interrupt pin (default).

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1 = INT pin is configured to function as a GPO.

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3B — Bit [0] INT_GPO

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0 = INT pin state is low (if INT_CONF = 1).

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1 = INT pin state is high (if INT_CONF = 1).

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When INT pin’s GPO function is disabled, it operates as an open drain pin. INT signal is active low; i.e., when

interrupt signal is sent, the pin is pulled to GND. External pullup resistor is needed for proper functionality.

3C VARIABLE

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3C — Bits [7:0] VARIABLE

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

3D RESET

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3D — Bits [7:0] RESET

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Writing 11111111 into this register resets the LP55231. Internal registers are reset to the default values.

Reading RESET register returns 00000000.

3E TEMP ADC CONTROL

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3E — Bit [7] TEMP_MEAS_BUSY

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1 = temperature measurement active.

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0 = temperature measurement done or not activated.

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3E — Bit [2] EN_TEMP_SENSOR

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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.

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0 = temp sensor disabled.

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3E — Bit [1] CONTINUOUS _CONV

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This bit is effective when EN_TEMP_SENSOR = 1.

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

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

3E — Bit [0] SEL_EXT_TEMP

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1 = temperature compensation source register addr 40H.

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0 = temperature compensation source register addr 3FH.

3F TEMPERATURE READ

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3F — Bits [7:0] TEMPERATURE

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