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DOC: SPII2CHDWBrief - V2.71 07/25/2017

PAGE 1

LB5900 Series Power Sensor

SPI & I2C Interface Guide

TABLE OF CONTENTS

......................................................................................................................... 1

NOTICE

............................................................................................................................................... 4

GENERAL

............................................................................................................................................ 5

Sensor Power

................................................................................................................................. 6

Data Line Electrical Specifications

................................................................................................. 6

Commands, Data Transmission & Reception

................................................................................. 6

Sensor Reset and Communication Port Reset

............................................................................... 6

Wiring Diagram & Connector Pin Out

............................................................................................ 7

USING I2C

........................................................................................................................................... 8

Electrical Data Connection and Addressing

................................................................................... 8

I2C Message Overview

................................................................................................................... 9

Processing Time Delay

............................................................................................................... 9

Clock, Start, Stop, Direction

....................................................................................................... 9

Acknowledge & NACK

................................................................................................................ 9

Sensor Busy & NACK

................................................................................................................ 10

I2C Timing

................................................................................................................................ 10

Data Format and Communications

.......................................................................................... 11

The Address byte

................................................................................................................. 12

The Status byte

.................................................................................................................... 13

Command Header

................................................................................................................ 14

Using NACK & ACK ........................................................................................................... 15

06h Send Command plus Prepare Status & Length ......................................................... 16

0Ch Prepare Complete Output Buffer ............................................................................. 19

I2C Measurement Example

.......................................................................................................... 20

USING SPI

......................................................................................................................................... 21

Содержание LB5900 Series

Страница 1: ...ion Port Reset 6 Wiring Diagram Connector Pin Out 7 USING I2C 8 Electrical Data Connection and Addressing 8 I2C Message Overview 9 Processing Time Delay 9 Clock Start Stop Direction 9 Acknowledge NACK...

Страница 2: ...ommand Header 23 Previous SPI communication status 23 Busyness 24 Busy Ready 24 Sensor Status Byte STB 25 Measurement Processing Time 25 Header Details 25 Command Header 06h Read Status Length 26 Comm...

Страница 3: ...14 Figure 11 ACK NACK Tests 15 Figure 12 Header 06h with Command Example 16 Figure 13 Header 06h used to Prepare Status Length 17 Figure 14 Read the Status and Length 18 Figure 15 Command Header 0Ch E...

Страница 4: ...ect Pin 1 SPI I2C Select directly to power or ground Do not connect it to a control line This line is tested at power up only and any startup glitches on the controller may cause erroneous selection t...

Страница 5: ...ffer option SPI the option enables sensor operation through SPI Serial Peripheral Interface or I2C Inter Integrated Circuit Each interface technology has its own advantages LadyBug recommends that the...

Страница 6: ...ed later may be in binary form In general SCPI commands sent USB I2C or SPI are identical There are however some exclusions and limitations The SPI and I2C interfaces do not accept concatenated comman...

Страница 7: ...or With option SPI a standard USB cable can also be connected and the sensor will function as a USB sensor when SPI is not enabled The SPI I2C connector end is a Samtec FFSD type or equivalent keyed 0...

Страница 8: ...yBug s nominal recommended value is 2 2K ohms The pull up resistors should be connected to the microcontroller s logic power supply 3 3 5 0 volts near the microcontroller High speed applications may b...

Страница 9: ...stop conditions are always generated by the master user controller After a start condition is issued the bus is considered to be busy and cannot be used for any other transactions until a stop condit...

Страница 10: ...ed and responds with ACK it is ready for a request if NACK is returned the master should wait A loop can be setup and continuous tests made until ACK is returned I2C Timing I2C timing conditions are s...

Страница 11: ...R W All messages begin by the user master issuing a standard I2C start condition and terminate with a standard I2C stop condition Each byte must be acknowledged by the receiver of the data The figure...

Страница 12: ...s ignored by sensors without matching addresses LadyBug utilizes I2C standard 7 bit addressing with bits 7 3 set as 10011 followed by two bits for sensor addressing then the direction bit as detailed...

Страница 13: ...The primary bit used is bit 4 which indicates that a message is available The message can be the measurement an error message or other information Figure 9 Status Byte Details It is important to note...

Страница 14: ...he indicated command Figure 10 I2C Command Header Table Note that reading data back from the sensor is done following one of the above commands and is detailed below with each command header explanati...

Страница 15: ...an error when it is not sent Figure 11 ACK NACK Tests The list below details how to use ACK NACK for testing At the end of this section is a complete measurement example ACK NACK should be utilized pr...

Страница 16: ...ed by hardware to determine the addressed sensor If only requesting the sensor status and the length of any available data no SCPI command or terminator is sent Direction address byte R W bit 0 Output...

Страница 17: ...ta is known Header 0Ch Read Complete Output Buffer can be used to read in the data Using the Prepare Status Length alone without a command is normally not required since the number of bytes available...

Страница 18: ...can be done after sending Header 06H and receiving ACK Normally if sent with no command the length of available data will be 0 and only the status byte is useful Figure 14 Read the Status and Length...

Страница 19: ...to sensor Start condition Address byte 0Ch Stop Condition Figure 15 Command Header 0Ch Example Read Complete Output Buffer is designed to pass the entire buffer back Any data left in the sensor output...

Страница 20: ...st for ready see below 8 Write FREQ 1000 MHZ use your frequency to sensor using Header 06h then wait 1ms Sets the measurement frequency 9 Test for ready see below 10 Write AVER COUN 10 use your of ave...

Страница 21: ...same name For example the output of the master must always be connected to the input of the slave This line is called MOSI Master Out Slave In The master s input is MISO Master In Slave Out Some micro...

Страница 22: ...gure 18 which details the sensors CPOL 1 and CPHA 1 SPI timing The clock is always generated by the master user controller and both the master and sensor capture data on the trailing clock edge The da...

Страница 23: ...ller is required to allow sufficient time for the sensor to process the function prior to requesting data During the time the sensor is processing data the master can address other sensors For example...

Страница 24: ...ed Figure 22 Byte Timing Diagram and Table Processing begins when the SS line is raised after a command is received from the master user controller During processing the sensor has limited capability...

Страница 25: ...r contains a message 5 32 Event Status Bit Future implementation 6 64 Master Summary Status Future implementation 7 128 Status Summary Future implementation Figure 23 Sensor Status Byte Measurement Pr...

Страница 26: ...e and the command will function as expected This is separate from the Sensor s measurement completion flag Measurement completion is indicated by bit 4 of the status byte however this byte is not vali...

Страница 27: ...Header F0h The length of Command Header F0h is dependent on the command being sent however the minimum is 5 bytes including the message terminator The minimum 5 bytes including the terminator is only...

Страница 28: ...st generate the required clocks This is done by sending irrelevant data to the sensor Figure 26 Command Header 0Ch Read Back Example Prior communication indicated that there are 16 bytes 010h availabl...

Страница 29: ...delay 3 INIT CONT 0 Sets the sensor for single triggered measurements 4 AVER COUN AUTO 0 Turns off automatic averaging 5 FREQ 1020 MHZ Sets the frequency 6 AVER COUN 10 Sets Averaging to 10 7 READ Ma...

Страница 30: ...d Length Loop refer to the READ Command at the end of this section 2 TRIG DEL AUTO 0 Turns off Trigger delay To the sensor F0000010TRIG DEL AUTO 000 At this point a 1ms delay can be added or a Read St...

Страница 31: ...n the controller program because it is known that the measurement will take at least that long Now test the sensor to see if the measurement is complete To the Sensor 060000000000 Send all 6 bytes Ret...

Страница 32: ...I E0 06 00 00 00 00 00 READ STB AND LENGTH FF E0 00 00 00 00 BUSY SPI E0 STB 00 BUFFER EMPTY 06 00 00 00 00 00 READ STB AND LENGTH FF E0 00 00 00 00 BUSY SPI E0 STB 00 BUFFER EMPTY 06 00 00 00 00 00 R...

Страница 33: ...on Pages 28 27 24 21 Document Revision V2 5 Clarification regarding SPI I2C Selection during Startup Important changes marked with on Pages 4 6 Document Revision V2 6 Document Minor text changes Docu...

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