DS2778K Maxim Integrated, DS2778K Datasheet - Page 6

• Manufacturer Part Number: DS2778K
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: DS2775, DS2776, DS2777, DS2778r

DS2775–DS2778 Evaluation Kits
Selecting the About topic from the Help menu (Figure
11) opens a window containing information about the
current revision of this program and Maxim Integrated
Products, Inc.
All program functions are divided under four tabs in the
main program window. Left-click on the appropriate tab
to move to the desired function page. Located on the
Real Time tab (Figure 12) is all the information mea-
sured and calculated by the DS2775–DS2778. That
data is divided between the Parametric Data, Fuel
Gauge Data, and SHA-1 subtabs. The Parameters tab
(Figure 24) gives the user access to the entire parame-
ter EEPROM memory block in terms of application units
and device units. The Memory tab (Figure 26) displays
the contents of every register and memory location
inside the DS2775–DS2778 and allows the user to alter
the data. The Log Data tab (Figure 27) allows the user
to store all real-time information to a file and view the
data in a graphical form.
The Real Time data tab is divided into three subtabs:
Parametric Data, Fuel Gauge Data, and SHA-1. The
Parametric Data subtab (Figure 12) contains all the
real-time measurements taken by the DS2775–DS2778.
The Fuel Gauge Data subtab contains all the fuel-
gauge values calculated by the DS2775–DS2778. The
SHA-1 subtab allows the user to exercise the SHA-1
encryption algorithm. The SHA-1 functions are only
supported by the DS2776 and DS2778.
Figure 10. Preferences Menu
Figure 11. Help Menu
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Program Tabs
Real Time Tab
The Parametric Data subtab displays the latest real-
time measurements of cell voltages, temperature, cur-
rent, and accumulated charge with both analog meter
readouts and digital values. The sense-resistor value
used to calculate the current reading is shown in the
Temperature section. Go to the Sense Resistor
(mOhms) value on the Parameters tab (Figure 24) to
change this value.
The present states of the charge control and discharge
control pins are shown at the bottom of the window.
These outputs are active low and drive two control FETs,
allowing charging and discharging of the cell pack. The
charge control pin can be controlled manually by left-
clicking the Disable Charging and Enable Charging
buttons and is forced high automatically by either an
overvoltage or charge overcurrent condition. The dis-
charge control pin can also be controlled manually with
the Disable Discharging and Enable Discharging but-
tons and is forced high automatically by either an under-
voltage or discharge overcurrent condition.
The present state of each of the four possible flag con-
ditions (overvoltage, undervoltage, charge overcurrent,
and discharge overcurrent) are represented by LEDs
inside the voltage and current sections of the window.
The corresponding LED is green while the flag is in the
cleared state. If conditions cause a flag to be tripped,
the LED turns red and a button appears that allows the
user to clear the flag, provided that clear conditions
have been met. If conditions for clearing the flag have
not been met by the circuit, clicking the Clear button
has no effect.