LMP92018

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SNAS514B – NOVEMBER 2011 – REVISED MAY 2013

INSTRUCTION SET

The following is a complete listing of the instruction set supported by the LMP92018. Where applicable the

default state or register content is indicated in bold type.

The digital interface (SPI) protocol is described in SERIAL INTERFACE. The interface timing diagram is in SPI

Interface Timing Diagram

NOTE: the tables in following sections detail the data transfers of 2 subsequent SPI frames . The FRAME

1 column shows the user input into pin DIN of the device. The FRAME 2 column in the device output at

DOUT.

TEMPERATURE SENSOR CONFIGURE

A single bit, TSS, controls the mode of operation of the internal temperature sensor. The bit can be set and

tested via the SPI transactions shown in the following table. The internal temperature sensor is described in

DIGITAL TEMPERATURE SENSOR.

FRAME 1: DIN

FRAME 2: DOUT

Command

Payload

Command

Payload

Bit

→

23

22:16

15:1

0

23

22:16

15:1

0

READ

1

0010000

x

x

1

0010000

000000000000000

TSS

WRITE

0

0010000

000000000000000

TSS

0

0010000

000000000000000

0

x

Don't Care

1: Temperature Sensor in Continuous Conversion Mode

TSS

0: Temperature Sensor In One Shot Mode

REFERENCE CONFIGURE

The internal reference mode of operation is controlled by a 3 bit sequence, CREF. The sequence can be set and

tested via the SPI transactions shown in the following table. The reference block is described in INTERNAL

VOLTAGE REFERENCE SOURCE.

FRAME 1: DIN

FRAME 2: DOUT

Command

Payload

Command

Payload

Bit

→

23

22:16

15:3

2:0

23

22:16

15:3

2:0

READ

1

0010001

x

x

1

0010001

0000000000000

CREF

WRITE

0

0010001

0000000000000

CREF

0

0010001

0000000000000

000

x

Don't care

Reference Mode Selector

000: AREF external, DREF internal

001: AREF and DREF internal; REF pin is internally disconnected

010: AREF and DREF external

CREF

011: AREF internal, DREF external

100: Deep Sleep

101: AREF and DREF internal; REF driven by internal reference

110: Deep Sleep

111: Deep Sleep

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