SC18IM704 datasheet(28/28 Pages) NXP

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NXP Semiconductors

SC18IM704

UART to I2C-bus bridge

Contents

General description ............................................ 1

Features and benefits .........................................1

Applications .........................................................2

Ordering information .......................................... 2

4.1

Ordering options ................................................ 2

Block diagram ..................................................... 2

Pinning information ............................................ 3

6.1

Pinning ...............................................................3

6.2

Pin description ................................................... 3

Functional description ........................................4

7.1

UART message format ...................................... 4

7.1.1

Write N bytes to target device ........................... 4

7.1.2

Read N byte from target device .........................5

7.1.3

Write to 18IM internal register ........................... 5

7.1.4

Read from 18IM internal register .......................5

7.1.5

Write to GPIO port .............................................5

7.1.6

Read from GPIO port ........................................ 6

7.1.7

Repeated START: read after write .....................6

7.1.8

Repeated START: write after write .....................6

7.1.9

Power-down mode .............................................7

7.1.10

Read version function ID ...................................7

I2C-bus serial interface ...................................... 7

Internal registers available .................................9

9.1

9.2

9.2.1

Baud Rate Generator (BRG) ............................. 9

9.2.2

Programmable port configuration

(PortConf1 and PortConf2) ................................9

9.2.2.1

Input-only configuration ................................... 10

9.2.2.2

Push-pull output configuration ......................... 10

9.2.2.3

Open-drain output configuration ...................... 10

9.2.3

Programmable I/O pins state register

(IOState) .......................................................... 11

9.2.4

I2C-bus address register (I2CAdr) ...................11

9.2.5

I2C-bus clock rates (I2CClk) ............................11

9.2.6

I2C-bus time-out (I2CTO) ................................ 12

9.2.7

I2C-bus status register (I2CStat) ..................... 12

Limiting values ..................................................13

Static characteristics ........................................13

Dynamic characteristics ...................................14

Package outline .................................................17

PCB layout .........................................................18

Soldering of SMD packages .............................22

15.1

Introduction to soldering .............................

15.2

Wave and reflow soldering .........................

15.3

Wave soldering ...........................................

15.4

Reflow soldering .........................................

Abbreviations .................................................... 24

Revision history ................................................ 24

Legal information ..............................................25

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section 'Legal information'.

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 22 September 2021

Document identifier: SC18IM704

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