2
dc1697af
DEMO MANUAL DC1697A
QUICK START PROCEDURE
Jumper Settings
VDD_SEL:
Selects the V
DD
source. It can be set to VIN,
INTVCC or EXTVDD (which requires a voltage to be present
at the EXTVDD turret.) Please see Hardware Configura-
tion section for examples of how these different jumper
settings are used.
SDA:
connects or separates the SDAI to SDAO pins. For use
with QuikEval
™
, leave it on TIE. The pins can be separated
in order to test applications using optoisolation.
ADR0, ADR1:
Selects the I
2
C slave address of the LTC2954.
Any changes here should also be made inside of QuikEval
for communications to persist.
External Connections
Signal connections are made via the row of turret posts
along the edges of the board.
GND:
(4 turrets)These turrets are connected directly to
the ground planes.
VIN:
Used as a supply and current sense input for the
internal current sense amplifier. Depending on the
configuration of VDD_SEL, can also be tied to EXTVDD.
EXTVDD:
High Voltage Supply Input. This pin powers an
internal series regulator with input voltages ranging from
5V to 80V and produces 5V for INTVCC when above 7V.
INTVCC:
Internal Low Voltage Supply Input/Output. This
turret is used to power internal circuitry and can be con-
figured as a direct input, as a linear regulator from a higher
voltage connected to V
DD
or as a shunt regulator. Please
see LTC2945 data sheet for more details.
ADIN:
ADC input measured by the onboard ADC. Can
measure between 0V and 2.048V.
VPU:
Pull up voltage for the _ALERT LED. Connected on
this board to a 5V isolated supply on the DC590. If a DC590
is not used and the DC1697A is operated independently,
a 5V supply should be provided here.
Digital Connections
SCL:
I
2
C Clock turret
SDA/SDAI:
I
2
C Bus Data input, can be tied to SDAO through
the SDA Jumper.
SDAO:
I
2
C Bus Data output. Should be connected to SDAI.
ALERT
:
Fault Alert Output. Connected to
ALERT
LED. Open
Drain logic output that is pulled to ground after an event
resulting in a fault occurs.
LEDs
ALERT:
Will light up red on an ALERT condition. Can also
be monitored on the ALERT turret.
INTVCC:
Will light up green when INTVCC is providing
power.
Operating Principles
The DC1697A was designed to be connected to the DC590
and controlled through the QuikEval suite of software. All
thresholds can be set and ADC registers read back through
the QuikEval interface, which was designed to provide a
convenient way to evaluate the LTC2945.
