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LTC3208 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3208
Description  High Current Software Confi gurable Multidisplay LED Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3208 Datasheet(HTML) 13 Page - Linear Technology

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LTC3208
13
3208fa
OPERATIO
Figure 4. Bit Assignments
ACK
123
ADDRESS
WR
456789
12345678
9
123456789
0
0
11
0
110
0
0
110110
S7
S6
S5
S4
S3
S2
S1
S0
S7
S6
S5
S4
S3
S2
S1
S0
76543210
76543210
ACK
STOP
START
SDA
SCL
ACK
SUB-ADDRESS
DATA BYTE
3208 FO4
Figure 5. Timing Parameters
tSU, DAT
tHD, STA
tHD, DAT
SDA
SCL
tSU, STA
tHD, STA
tSU, STO
3208 F05
tBUF
tLOW
tHIGH
START
CONDITION
REPEATED START
CONDITION
STOP
CONDITION
START
CONDITION
tr
tf
tSP
RREF Current Set Resistor
The current set resistor is connected between RREF and
ground. The value of this resistor should typically be near
24k since all of the DAC reference currents and support
circuit currents are related to this set current.
This input is protected against shorts to ground or low
value resistors <10k. When a fault is detected the reference
current amplifier is current limited. In addition, the current
source outputs and charge pump are disabled.
Fullscale LED Current Equations
AUX fullscale LED current Amps
V
RREF
() =
1 215
518
.
•
SUB MAIN fullscale LED current Amps
V
RRE
/
.
()=
1 215
FF
• 543
CAM fullscale LED current Amps
V
RREF
() =
1 215
202
.
•5
5
RGB fullscale LED current Amps
V
RREF
() =
1 215
533
.
•
Mode Switching
The LTC3208 will automatically switch from 1x mode
to 1.5x mode and subsequently to 2x mode whenever
a dropout condition is detected at an LED pin. Dropout
occurs when a current source voltage becomes too low
for the programmed current to be supplied. The dropout
delay is typically 400µs.
The mode will automatically switch back to 1x whenever
a data bit is updated via the I2C port or when the CAMHL
pin switches from high to low.
I2C Interface
The LTC3208 communicates with a host (master) using
the standard I2C 2-wire interface. The Timing Diagram
(Figure 5) shows the timing relationship of the signals on
the bus. The two bus lines, SDA and SCL, must be high
when the bus is not in use. External pull-up resistors or
current sources, such as the LTC1694 SMBus accelerator,
are required on these lines.
The LTC3208 is a receive-only (slave) device.



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