ISL12026DBEV1Z Datasheet ISL12026DBEV1Z, ISL12027IBZ-EVAL | P1-P3

Real Time Clock USB Evaluation System

Introduction

This evaluation system is a hardware and software platform

for testing Intersil Real Time Clock (RTC) devices, and the

system requires only a PC for the controller and power

functions. Intersil offers a large portfolio of RTC devices, with

features including a crystal oscillator, clock and date counters,

auto switch-over to battery backup, voltage monitoring with

low voltage reset, a watchdog timer, and alarms. The

ISL1209/19/21/32 devices include an event-detection

feature, and all but the ISL1209 include a time stamp function

for recording the time of the event. The ISL12022 features an

on-chip temperature sensor and temperature compensation,

while the ISL12020M/22M/22MA devices are RTC modules

with internal crystals. These module versions are factory

calibrated to account for crystal variability, and the on-chip

temperature sensor enables automatic crystal temperature

compensation, for the best RTC accuracy over temperature.

The evaluation system enables users to test all of these

functions, and to evaluate device performance criteria, such as

long-term clock accuracy. Hardware options, such as battery

and crystal types, can also be tested. The software sets up

easily, and enables evaluation of all major RTC functions. The

hardware’s two-piece construction - utilizing a motherboard

and a daughterboard - allows the evaluation of multiple RTC

products simply by switching out small daughterboards.

Operation and Overview of the

RTC Evaluation Board

Connections

The evaluation board consists of a motherboard and

daughterboard which connect together via J1 and J2. The

hardware uses a USB connection to communicate with the PC

loaded software, and USB drivers must be installed on the PC.

The provided USB cable, with type A and B connectors, is

required to hook up the board to a PC. The cable should be

connected to the PC first and then to the evaluation board.

Once connected, you will hear the USB “enumeration” tone,

and the motherboard “POWER” LED illuminates, indicating

that the USB connection is providing the +5V power.

Powering Down

The motherboard contains backup power sources, either a

supercap or an optional battery, so the RTC might operate off a

backup source when V

powers down. If the user wishes to

totally power down the RTC device (e.g., a hard reset), either

disconnect the daughterboard from the motherboard or

connect motherboard jumper J4 to the “GND” position to

eliminate the backup sources. There is a 0.1µF V

decoupling

capacitor on the daughterboard, which must discharge fully

before the RTC device stops operating. This discharge time can

be up to one second when using a V

of 5V. Note that when

powered down, the RTC board cannot be monitored by the RTC

evaluation software.

Installing the RTC Software and USB Drivers

• Note: If you have previously loaded the Intersil RTC

evaluation software on the PC, you need to uninstall the

previously loaded version of the Intersil RTC Evaluation

software on the PC, Navigate to the uninstall program “All

Programs > Intersil > RTC_EVAL > RTC_uninstall” and run it.

If the uninstall program did not delete the old desktop

shortcut (right click on icon, then “delete”). Last you need to

uninstall the USB drivers before running the following install.

Go to Device Manager, (Control Panel, System, Hardware)

with the Eval board plugged in. Locate the “USBXpress

Device” under the “Universal Serial Bus controllers” branch

and then right click and select the “Uninstall”.

• Download the appropriate Installation program from the

Web. The same installation file is used for all Intersil RTC

Products, but changes for the Windows Version your

computer is running. The basic link to these installers is:

http://www.intersil.com/content/dam/Intersil/documents/

rtc_/ (add Web File name from below) or go to the products

main page and select the “Documents” tab.

• For Windows 2000 the Web File name is

“RTC_EVAL_Installer_w2k_V405.exe”

• For Windows XP & WIN7 the Web File name is

“RTC_EVAL_Installer_V405.exe”

• For Windows 8, the Web File name is

“RTC_EVAL_Installer_Win8_V405.exe”

• WIN8 Note: Before running the WIN8 installer there is a pre-

installation document on the Web that must be followed.

File name is

RTC_WIN8_Preinstallation_Procedure_081613.PDF.

Download this file, open it and follow the procedure.

• Do not plug in the RTC USB evaluation board yet.

• Double click on “RTC_EVAL_Installer...”.

•Click “Next”.

• If you agree with the license conditions, click “I accept” in

the license window, then click “Next” to install.

• Select a “Destination Location”, and click “Next”.

• Select a “Start Menu Folder”, and click “Next”.

• Click on “Create a Desktop Icon” and click “Next”.

Intersil RTC Devices Supported

WITH USER EEPROM NO USER EEPROM

ISL12024 ISL1208 ISL12020M

ISL12025 ISL12008 ISL12022M

ISL12026/26A ISL1209 ISL12022MA

ISL12027/27A ISL1218 ISL12032

ISL12028/28A ISL1219 ISL12057

ISL12029/29A ISL1220 ISL12058

ISL1221 ISL12059

ISL12022 ISL12082

Application Note 1745

October 9, 2013

AN1745.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

Application Note 1745

AN1745.2

October 9, 2013

• Click “Install” (you might get an error here if installing on an OS

older than XP, but disregard).

• In “Motherboard Driver Installer” window, click “Install”.

• In pop-up window, click on “Install the Driver Software Anyway”

(Win 7 and Win 8 only).

• Click “OK”, and then click “Finish”.

The following instructions apply only to non WIN 7 and WIN8

systems:

• After the software install, plug in the USB cable and

motherboard, and the hardware installation wizard should

appear.

• If asked for the location of drivers, use C:/Program Files

(x86)/Intersil/RTC_EVAL/USB_Driver directory as the source.

Note (x86) only for WIN7 & WIN8 Systems.

• Click “Next” to install the drivers and then “Finish” to complete

the installation.

The installation program places the RTC evaluation software

(RTC13.exe) in: C:\Program Files (x86)\Intersil\RTC Eval on a

WIN7 and WIN8 PC, or in C:\Program Files\Intersil\RTC Eval on

an XP or older PC.

Using the Software

To start the evaluation software, double click on the Desktop

“RTC Evaluation” icon, or double click on C:\Program

Files\Intersil\RTC Eval\RTC13.exe and the GUI (Graphical User

Interface) should appear as shown in Figure 1. This first screen is

the “Setup” page, as indicated on the function tab near the top of

the GUI. The screen’s bottom margin contains USB connection

status messages, with the center message indicating if the USB

device is disconnected or active.

There are multiple tabs (e.g., “Set Clock”) at the top of the GUI.

These tabs take the user to screens for setting up the RTC and for

controlling its functions, and each of the tabs is discussed in the

following sections.

There are icons in the top tool bar to print the register contents

and the “Graph” screen deviation plot, and to control V

to the

daughterboard. The printer icon prints the current register values,

and the “RTC Deviation” plot from the “Graph” screen, to the PC’s

default printer. To print the actual register values, the user must

first use the “Register” tab to read the current contents of all

registers. Simply select a register group from the drop-down box,

and then click the “Page Operation” “Read” button. Repeat the

process until all register groups have been read, and it is best to

read the “RTC” group last, so the time/date registers are as up to

date as possible. The switch icon toggles the daughtercard V

from disabled (open switch icon) to enabled (closed switch icon),

and vice versa. The icons remain visible from all screens, as do

the polled RTC values displayed in the right-hand margin.

There are three common causes if the following error box

appears during a read or write cycle with the RTC:

1. The PC has powered down, gone into screen lock, and

powered back up. Unplugging and replugging the USB cable

fixes this problem.

2. The “VDD Enabled” check box on the “Setup” screen isn’t

checked, or

3. The daughtercard’s “DEV VCC” (or “JVDD”) jumper is missing.

Correcting these three problems should eliminate the error.

“SETUP” TAB

There are three sections to the Setup screen, plus a

time/date/temperature display section. The left section

indicates the selected RTC device, and that RTC’s features are

listed in the large text box. RTC selection is via the drop-down

box, and the device selection determines which other tabs the

GUI displays.

The middle left section has five functions. The “V

Enabled”

check box controls the motherboard’s RTC V

switch. Clicking

this check box enables or disables V

to the daughterboard,

and to the I

C pull-up resistors. Note that when this box is

unchecked, no communication with the RTC daughterboard is

possible. The switch icon in the GUI’s top tool bar performs the

same function as the “V

Enabled” check box. With V

on,

clicking the switch icon shuts off the daughterboard’s V

, and

the icon displays an open switch. Clicking the icon again,

reapplies V

and the icon displays a closed switch. The I

C bus

speed - either 100kHz or 400kHz - is selected from the middle

drop-down box. The temperature sensor type (daughterboards

have either an LM75 or an LM76) is selected via the two “radio”

buttons, with the default value being the more common “LM75”.

A nonsensical reading in the “LM75 Temperature” box in the

right-hand margin may indicate that the daughterboard contains

an LM76. The sensor’s temperature value can be calibrated by

adding an offset to the sensor reading via the “Temperature

Calibration” box. Set the “Eval Board Select” drop-down box to

“USB RTC”.

The middle right section is the Status register display and event

reset section (this latter feature is only for the ISL1208 through

ISL1221). The relevant status bits for the selected RTC are

displayed as lights in the upper section and those bits can be

cleared using the buttons in the lower section.

Application Note 1745

AN1745.2

October 9, 2013

Time, Date, and Temperature readings are displayed in the right-

hand margin, regardless of which function tab is selected, and

this section contains the following information:

• PC Time - The time kept on the PC; displayed all the time.

• RTC Time - The time currently stored in the RTC’s time

registers, displayed only if polling is enabled (i.e., box is

checked at bottom of right-hand margin). The display matches

the RTC’s selected time format (i.e., 12 or 24 hour mode).

• RTC Deviation - The current delta between RTC time and PC

time.

• PC date - The current date kept on the PC; displayed all the

time.

• RTC date - The date currently stored in the RTC’s date, month,

and year registers, displayed only if polling is enabled.

• Temperature - The current reading of the daughterboard

temperature sensor, displayed if polling is enabled. If there is

no temperature sensor the window is blank. Most Intersil RTC

daughterboards use the LM75 device. Older daughterboards

may have used the LM76 device, so if the reading is way off,

try clicking the “radio” button labeled “LM76” in the

“Temperature Calibration” section.

• Enable Polling - Checking this box causes the software to

automatically poll the time/date, status, and LM75

temperature registers every second. The results are displayed

in this right-hand side GUI section, and the Status register

results are reflected in the state of the LEDs on the various

screens.

Polling Caveats - Polling can confound user initiated Status

1) Some devices (e.g., ISL12026/26A) reset the Status

enabled, a set alarm bit resets within a second, due to the next

polling cycle. Thus, a user initiated Status register read after a

polling cycle may return alarm bits as zeros, even though an

alarm occurred. To prevent this, click on the “Enable Polling”

check box - to uncheck it and thereby disable polling - while

evaluating the ISL12026 alarms.

2) Setting the ARST bit in the Status register in many devices

causes alarm bits and some other status bits (e.g., ISL12082

TMR and BAT bits) to reset after a Status register read. Again,

the solution is to disable polling while evaluating the ARST and

alarm functions.

“SET CLOCK” TAB

This tab contains two sections for setting the RTC’s time/date. The

“Time and Date Selection” section (left side) allows the user to

select the desired RTC time, date, and format. The time may be

typed into the “Set Time” boxes (do not enter the leading “0” in the

hours box if using 12 hour format), or clicking in an individual box

allows the GUI’s up and down arrow keys (to the right of the boxes) to

increment or decrement the current entry. Select the month, date,

and year from the calendar section below the “Set Time” boxes

(note: the day of the week is not set when you use this section).

The middle section actually writes the RTC with either the user

selected data, as described in the previous paragraph, or with the

PC’s current time. The buttons that trigger these actions are

described in the following.

One advantage of using this screen to set the RTC time is that the

software automatically handles the time/date register (i.e., “RTC”

registers) “interlock” that is incorporated in most Intersil RTC

devices. See the “Registers Tab” section below for details. After

FIGURE 1. EVALUATION SOFTWARE GUI MAIN TAB (SETUP)

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

ISL12026DBEV1Z

Mfr. #:

Buy ISL12026DBEV1Z

Manufacturer:

Renesas / Intersil

Description:

Clock & Timer Development Tools ISL12026DBEV1Z EVAL BOARD 1 - 8LD SOIC

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New from this manufacturer.

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ISL12026DBEV1Z

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