NXP Semiconductors SC18IM704-EVB User manual

UM11664
SC18IM704-EVB evaluation board
Rev. 1.0 — 28 September 2021 User manual
Document information
Information Content
Keywords SC18IM704, UART to I2C, SC18IM700, I2C Controller, I2C bridge, UART
bridge
Abstract SC18IM704 is designed to serve as an interface between the standard UART
port of a host and the serial I2C-bus. This allows the host to communicate
directly with other I2C-bus devices.

NXP Semiconductors UM11664
SC18IM704-EVB evaluation board
Rev Date Description
v.1.0 20210928 Initial version
Revision history
UM11664 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 1.0 — 28 September 2021
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NXP Semiconductors UM11664
SC18IM704-EVB evaluation board
Important notice
NXP provides the enclosed product(s) under the following conditions:
This evaluation kit is intended for use of ENGINEERING DEVELOPMENT OR
EVALUATION PURPOSES ONLY. It is provided as a sample IC pre-soldered to a
printed circuit board to make it easier to access inputs, outputs, and supply terminals.
This evaluation board may be used with any development system or other source of
I/O signals by simply connecting it to the host MCU or computer board via off-the-
shelf cables. This evaluation board is not a Reference Design and is not intended to
represent a final design recommendation for any particular application. Final device in
an application will be heavily dependent on proper printed circuit board layout and heat
sinking design as well as attention to supply filtering, transient suppression, and I/O
signal quality.
The goods provided may not be complete in terms of required design, marketing, and
or manufacturing related protective considerations, including product safety measures
typically found in the end product incorporating the goods. Due to the open construction
of the product, it is the user's responsibility to take any and all appropriate precautions
with regard to electrostatic discharge. In order to minimize risks associated with the
customers applications, adequate design and operating safeguards must be provided
by the customer to minimize inherent or procedural hazards. For any safety concerns,
contact NXP sales and technical support services.
UM11664 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 1.0 — 28 September 2021
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NXP Semiconductors UM11664
SC18IM704-EVB evaluation board
1 Introduction
SC18IM704 is designed to serve as an interface between the standard UART port of a
microcontroller or microprocessor and the serial I2C-bus; this allows the microcontroller
or microprocessor to communicate directly with other I2C-bus devices. SC18IM704 can
operate as an I2C-bus controller. SC18IM704 controls all the I2C-bus specific sequences,
protocol, arbitration and timing. The host communicates with SC18IM704 with ASCII
messages protocol; this makes the control sequences from the host to SC18IM704
become very simple.
This document is intended to help the users to quickly setup, configure and operate the
SC18IM704-EVB evaluation board in the users’ hardware platform.
2 Finding kit resources and information on the NXP web site
NXP Semiconductors provides online resources for this evaluation board and its
supported device(s) on http://www.nxp.com.
The information page for SC18IM704-EVB evaluation board is at http://www.nxp.com/
SC18IM704-EVB. The information page provides overview information, documentation,
parametrics, ordering information and a Getting Started tab. The Getting Started tab
provides quick-reference information applicable to using the SC18IM704-EVB evaluation
board, including the downloadable assets referenced in this document.
2.1 Collaborate in the NXP community
The NXP community is for sharing ideas and tips, ask and answer technical questions,
and receive input on just about any embedded design topic.
The NXP community is at http://community.nxp.com.
3 Getting ready
Working with the SC18IM704-EVB evaluation board requires the kit contents.
3.1 Kit contents
•Assembled and tested evaluation board in an anti-static bag
•Quick Start Guide
4 Getting to know the hardware
The SC18IM704-EVB evaluation board is designed to be connected to an external UART
via a 9-pin RS-232 connector (J1). The SC18IM704-EVB evaluation board has an on-
board I2C target serial EEPROM and an I2C target LED blinker, which can be directly
accessed by the external host UART via SC18IM704. The external host UART can write,
read, and program the serial EEPROM/LED blinker without requiring an I2C target to be
connected to the board.
The SC18IM704-EVB evaluation board also has a I2C interface header (JP2) to allow
other I2C target devices to be connected to the evaluation board. These I2C target
devices can be accessed directly by the external host UART via the SC18IM704 UART to
I2C bridge.
UM11664 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 1.0 — 28 September 2021
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NXP Semiconductors UM11664
SC18IM704-EVB evaluation board
The power for the SC18IM704-EVB evaluation board is provided via the micro-B USB
(J2), or via the I2C interface header (JP2).
The SC18IM704-EVB evaluation board 9-pin RS-232 port (J1) is intended to be the
main UART interface to the host’s UART, but UART TX and RX CMOS level signals are
available on JP5. When JP5 is used to interface to the host’s UART then the jumper on
JP4 should be removed to remove power from the RS-232 line driver.
4.1 Headers and jumpers
Please refer to Figure 1 to find the location of connectors and jumpers on the
SC18IM704-EVB evaluation board.
Figure 1. Headers and jumpers
4.2 Jumper settings
Header Jumper on/off Comment
JP3 ON Pull out and insert current meter if SC18IM704 current is to be
measured
JP4 ON Pull out if UART interface is on JP5
Table 1. Jumper settings
JP5 – UART Header Function
1 UART_RX
2 UART_TX
3 GROUND
Table 2. JP5 - UART header
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