Evaluation Software Details
Updates the displayed measurements for this device. The conversion is started by
sending the register command CONVERT[CONV]=1,
or hardware by toggling the CONV pin if the HW IO CONTROL box is checked.
5.1.1
Volatile RAM Configuration Registers
–
The lower half of this area displays the volatile configuration registers shown as bit fields, see the
bq76PL536 data sheet for details on programming these registers. These registers display green for logic
0, and orange for logic 1. The two states may be toggled between by left-clicking on the bit
The STATUS, COV_FAULT, and CUV_FAULT bits are either white (logic 0) or red (logic 1) for asserted.
In most cases, the asserted state indicates an error condition sensed by the bq76PL536.
To clear a fault, first remove the physical condition causing the fault, then click on the ALERT or FAULT
bit to reset the state of the bit. This writes a 1 to the bit, followed by a 0, which is the device
’
s method for
clearing the asserted bit state back to logic 0.
5.1.2
Group-3 Protected Registers
–
The device is provided with many configuration options set by bits contained in a special set of registers
protected against accidental writing. These RAM registers are initialized from OTP (One-Time
Programmable) EPROM cells. The device is shipped with these EPROM locations un-programmed
(blank). The Windows GUI interface hides the un-programmed nature of the device by setting defaults in
the registers cells when the Evaluation software starts (this can be defeated by setting the TOOLS |
OPTIONS defaults). The last settings are also automatically saved by the GUI and restored on next use.
These features are provided for ease of use, and are implemented solely in the GUI. Users are
responsible for programming OTP bits in parts correctly during manufacturing for correct operation
in-circuit.
Some Group-3 registers are shown as registers at the bottom of the left side of the screen, the others in
the top right section of the screen as listboxes and registers
5.1.3
Quick Access
The Quick Access register(s) provide R/W access to any location in the part. They are named arbitrarily in
the GUI
‘
X
’
,
‘
Y
’
, and
‘
Z
’ –
there are no XYZ registers in the part. Some registers, such as the MASTER
register require multi-byte writes to
“
unlock
”
the target register for writing. To accomplish this, program the
X register address/data with the first unlock key, the Y register with the second unlock key, and finally the
Z register with the target address and data. Then use the
“
write all
”
button to send all three address/data
bytes in the correct order and timing to accomplish the multi-byte write. (This is done automatically when
using the
window.)
5.1.4
LED Status Indicators
At the top right of the user interface screen are 8 status indicator "LED's". These provide a quick view of
the status of the devices, and the interface, cable connections, etc. Green normally indicates a logic 0
condition, and red a logic one condition. Gray indicates undefined.
8
bq76PL536 EVM Quick Start Guide
SLUU437B
–
October 2010
–
Revised May 2011
Copyright
©
2010
–
2011, Texas Instruments Incorporated
