Recommended DC Operating Conditions
Maximum input current
Maximum input voltage
BAT input voltage
THERM input voltage
2.0 + VBAT
18 + VBAT
V Note 1
1. The VDC+ limits consider the appropriate Zener diode at D11. The voltage at D11 is application-
specific and limits the VGS of Q1 to a safe enhancement value during Q1 conduction. See Table 1 for
recommended D11 selections per VDC+.
Appendix B (Troubleshooting) if the program does not
establish communication with the EV2014x.
The EV2014x uses the PC-AT real-time clock to provide
the proper bit timing for serial communication with the
bq2014. The modem control lines are used as the single-
wire serial interface to the bq2014. Any TSR that uses
the PC real-time clock affects the operation of the
EV2014x. For proper operation, the EV2014x should
not be operated from a DOS shell program.
If the PC is a notebook or portable type, it may be con-
figured to save battery power by adjusting the clocks ac-
cording to the activity under way. Configure the
notebook to run in “High Performance” mode for reliable
communication between the EV2014x and the PC. The
EV2014x UIP terminates if communication with the
EV2014x board is lost.
Start the User Interface Program as follows:
Using the EV2014x Program
EV2014x is a menu-driven program. Almost all of the
functions and entries are made by positioning the high-
lighted cursor on the function desired and pressing the
ENTER key, or by typing a value and then pressing the
Key functions are as follows:
Use the arrow keys to move the high-
lighted cursor around the screen.
Press the ENTER key to select the value
currently being displayed for a parame-
ter, or to perform a function selected by
the highlighted cursor.
Press the ESCAPE key to escape from
any function back to the main menu, or to
escape from any parameter value screen
back to the menu displaying that parame-
Press the F3 key to display a help file for
the selected function or parameter.
The Main Menu appears after the EV2014x program
has started. If this menu does not appear, communica-
tion with the EV2014x has not been established; please
refer to Appendix B (Troubleshooting) if the EV2014x
does not display the Main Menu.
The Main Menu shows six functions that may be acti-
vated; see Figure 1. Use the cursor keys (arrow keys) to
position the highlighted cursor over the function to be
activated and press the ENTER key. For help, press the
F3 key, and a help note about the function appears.
Press the ESCAPE key to exit from the EV2014x pro-
The Main Menu functions are as follows:
<Initialize> Sends a reset command to the bq2014
<Monitor> Activates a screen from which the bq2014
activity is monitored on a real-time basis.
Activates a screen from which the Digital
Magnitude Filter can be changed. The
default filter value is -0.3mV, +0.38mV.
The bq2014 data sheet (Dec. 1994 B or
later) defines valid options for this filter.
<Data Log> Allows entering a file name to which
bq2014 data will be logged, and the log-
ging period in seconds. When the log is