TEMPCOMPRTC-RD Datasheet TEMPCOMPRTC-RD | P4-P6

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6. TC-RTC Demonstration

The following step-by-step demonstration explains the various features and capabilities of this reference design.

There are two interfaces available for the RTC—UART and SMBus, which are demonstrated in sections 6.1 and

6.2, respectively.

6.1. UART Interface Demonstration

The TC-RTC Evaluation Board comes preloaded with firmware that enables the UART interface. The following

sections show how to set up and use this interface.

6.1.1. PC Software Setup

On the PC, set up HyperTerminal to use the COM port at 9600 baud, 8-N-1, and no flow control. Detailed

instructions to set this up are shown below.

1. Launch HyperTerminal from your Start Menu: Start Menu→Programs→Accessories→Communications→

HyperTerminal.

2. Type any name for the new connection, and click OK.

3. In the”Connect using:” drop-down list, Choose “COM1”, or if you have multiple COM ports, choose the one you

want to use.

4. Set up the COM1 Properties dialog as shown in Figure 3, and click OK.

5. Select “File→Properties→Settings→ASCII Setup”. Check the box marked “Echo typed characters locally”, and

click OK. See Figure 4.

Figure 3. HyperTerminal Settings

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Figure 4. HyperTerminal ASCII Setup

6.1.2. Hardware Setup

1. Connect the provided DB9 serial cable between the PC’s serial port and the TC-RTC evaluation board

connector J5.

2. Apply power to the evaluation board using the provided dc power adapter.

6.1.3. Interacting with the TC-RTC

1. After the board is powered on for the first time, the board firmware will perform a temperature sensor/ADC offset

calibration. For valid calibration, a soak period is required before the calibration is done. Wait for 15 seconds for

calibration to complete. At the end of calibration, the green LED on the board will start blinking at a 1 Hz rate.

2. HyperTerminal should now be displaying initial date, time and temperature information from the board. You can

program the current date and time data into the board. This data should be trans-coded to the format expected

by the device firmware. Refer to "Appendix B—TC-RTC: Implementation Details" on page 12 for the data

format. Note that the AM/PM information is encoded in the same byte as the hour. Here are some examples:

06:31:09 PM, Thursday, May 04, 2006→09 31 66 04 04 05 06

11:05:39 AM, Saturday, December, 08, 1979→39 05 51 06 08 12 79

3. Type the “s” command to toggle off the auto-display mode that displays the time once every second. Note that

commands should be only in lower case.

4. Type the following “w” command (write) to program the device with a new time and date. See "Appendix A—TC-

RTC: Supported Commands" on page 11 for command formats.

w000709316604040506

5. Type the “r” command (read) to get the current time and date information from the device.

r0007

6. Type the “s” command to toggle on the auto-display mode.

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Figure 5. Interacting with the TC-RTC—HyperTerminal Session

An index of all supported commands is available in "Appendix A—TC-RTC: Supported Commands" on page 11.

Detailed information about this reference design is contained in “AN293: Temperature Compensated Real Time

Clock Reference Design Programmer’s Guide”.

6.2. SMBus Interface Demonstration

The TC-RTC Evaluation Board can be loaded with firmware that can enable an SMBus/I

C interface. This is

described in the following sections.

6.2.1. Firmware Download

The TC-RTC Evaluation Board comes preloaded with firmware that enables the UART interface. In order to enable

the SMBus interface, alternate firmware has to be loaded on the device. The steps in this section will guide you

through downloading the TC-RTC firmware with SMBus interface to the TC-RTC evaluation board.

1. Install the Silicon Laboratories IDE from the Reference Design Kit CD. Launch the IDE by choosing "Start

Menu→All Programs→Silicon Laboratories→Silicon Laboratories IDE". If you need more information about

installing and using the IDE, please refer to the C8051F300DK Development Kit User's Guide, which is

available on this web page:

http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers/en/C8051F300DK.htm

2. Depending on which type of debug adapter you have, set up the hardware as shown in one of the two diagrams

below (Figure 4, Figure 5). Consult the C8051F300DK User’s Guide if you need detailed instructions.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P14

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