DC786A Linear Technology, DC786A Datasheet - Page 4

• Manufacturer Part Number: DC786A
• Description: LTC4260CGN 200W Positive 48V Hot Swap Controller With Current And Voltage Monitoring (req DC590)
• Manufacturer: Linear Technology
• Series: -r

Specifications of DC786A

• Main Purpose: Power Management, Hot Swap Controller
• Embedded: No
• Utilized Ic / Part: LTC4260
• Primary Attributes: 200W, 36 ~ 72 V
• Secondary Attributes: I²C Interface
• Kit Application Type: Power Management
• Application Sub Type: Hot-Swap Controller
• Kit Contents: Quick Eval Software
• Lead Free Status / Rohs Status: Not applicable / Not applicable

BD_PRST\ and an I2C command to turn on. (OV and
UV conditions must also be satisfied.)
JP3 SDA: COM is the normal configuration, shorting
SDAO and SDAI together. SPLIT allows adaptation to
isolated systems; see data sheet Figure 13.
JP4, JP5, JP6, ADR0,1,2: sets address by strapping
ADRx pins high, low, or allowing them to float.
JP7 I2C PORT: connector for DC590A I2C adaptor
card. This converts a computer's USB port to I2C.
DC590A also supplies power via JP7 to D4-7. If
DC590A is not connected, D4-7 will not light.
JP8 ADIN: selects either +48V INPUT or ADIN turret
as an input for the ADIN pin. Use divider R14, R17 to
scale inputs from the turret.
EVALUATION SOFTWARE
The Quick Eval software is available from the LTC web-
site, and requires a DC590A to interface the software
(running on a PC with a USB port) to I2C (at JP7). At-
tached is a quick start guide for the software. Figure 1.
shows the default graphical user interface.
1) Register Display Options
The bits of registers A, B, C, or D, are shown in detail
depending on the option selected (Figure 2A, 2B 2C,
and 2D). Checking a box to the left of each bit of the
Read/Write registers sets the respective bit, while un-
checking a box clears the bit. The bit status is shown
to the right of each bit after every refresh of the inter-
face. The Clear button for register D clears out the bits
in this register.
In the Register List option (Figure 2E) a display of a
status bit map of the all the registers is shown and is
updated with each refresh of the interface.
The Reg Send option (Figure 2F) allows for the user to
enter and send data to a particular register. Select the
register to be written to in the drop down menu. Enter
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the data in hex and click on Send Data to send the data
or Send/Refresh so send and refresh the interface.
2) START/Refresh Buttons
Click on the START button to enable a timer that con-
tinuously updates the interface with the latest data
from the LTC4260 approximately every 500ms. This
button will display STOP when the timer is enabled.
Click on STOP to stop the timer. Click on Refresh for a
single update.
3) FET Control
The status of the FET is shown with a color display.
When the FET On bit (C3) is read as high and the FET
On Control bit (A3) is set, the FET is On, the shape
display will be green and the FET control button will
read “Turn FET Off”. If C3 is low and A3 is set, the FET
is off, the shape display will be the color red and the
FET control button will read “Clear Faults”. In all other
cases, the FET is off, the shape display is red and the
FET control button will read “Turn FET On”
The “Turn FET On” control button sets bits A3 logic
high. “Turn FET Off” or “Clear Faults” clears bit A3 to
logic low.
4) Address Selection
Select in the drop down list box the Write address byte
of the LTC4260 that is to be communicated with. If
multiple LTC4260s are on the bus lines, the Mass
Write address BEh can be selected to communicate
with all LTC4260s at the same time. The Auto find but-
ton will scan through the 27 individual LTC4260 ad-
dresses and list which addresses responded with an
acknowledge. The ARA button sends the Alert Re-
sponse protocol and displays the address of the device
that replies with its address.
5) Data Display Option