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LTC3205
OPERATIO
I MAIN / SUB = N
LTC3205 is in shutdown when DV CC is grounded. Note,
however, that all of the logic signals that are referenced to
DV CC (D IN , SCLK, LD, ENRGB and STEPUP) will need to be
at DV CC or below (i.e., ground) to keep from violating the
absolute maximum specifications on these pins.
Serial Port
The microcontroller compatible serial port provides all of
the command and control inputs for the LTC3205. Data on
the D IN input is loaded on the rising edge of SCLK. D15 is
loaded first and D0 last. Once all bits have been clocked into
the shift register, the command data is loaded into the
command register by bringing LD low. At this time, the
command register is latched and the LTC3205 will begin
to act upon the new command set. The serial port uses static
logic registers so there is no minimum speed at which it can
be operated. Figure 3 shows the operation of the serial port.
Table 1 shows the mapping of the serial port bits to the
operation of the various displays. Bits D15 and D14
control the brightness of the four LEDs in the main display.
Bits D13 and D12 control the brightness of the two LEDs
in the sub display. The red, green and blue LEDs each have
The current levels of both the main and sub displays are
controlled by precisely mirroring a multiple of the current
at the I MS pin.
The main and sub display LED currents will follow the
relationship:
1 . 223 V
R MAIN / SUB
where N is equal to 400, 200, 100 or 0 depending on which
current setting is selected. R MAIN/SUB is the value of the
resistor on the I MS pin. The scale factors are spaced pseudo
exponentially to compensate for the vision perception of
the human eye (zero is a special case needed for
shutdown).
The LTC3205 can power up to six white LEDs (four for the
main display, two for the sub display), however, it is not
necessary to have all six in each application. Any of the four
main or two sub LED outputs can be disabled by connect-
ing the unused output to CPO.
Table 2. Main and Sub Display Current Levels
four bits assigned giving a linear range of 16 brightness
levels to each of the LEDs.
Programming the MAIN and SUB LED Currents
Table 2 indicates the decoding of the Main and Sub display
control bits.
D15
D13
0
0
1
1
D14
D12
0
1
0
1
FRACTION OF
FULL-SCALE
CURRENT (%)
0
25
50
100
t LC
t DS
t DH
t H
t L
t CL
t LW
SCLK
D IN
X
D15
D14
D2
D1
D0
X
LD
3205 F03
Figure 3. Serial Port Timing Diagram
Table 1. Serial Port Mapping
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MAIN1-
MAIN4
SUB1-
SUB2
Blue LED Duty Cycle
(Table 3)
Green LED Duty Cycle
(Table 3)
Red LED Duty Cycle
(Table 3)
Current
Level
(Table 2)
Current
Level
(Table 2)
3205f
8
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