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LDS8160 Datasheet(PDF) 13 Page - IXYS Corporation

Part No. LDS8160
Description  Dual-Output RGB / 6-Channel WLED Driver
Download  39 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8160 Datasheet(HTML) 13 Page - IXYS Corporation

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LDS8160
© 2009 IXYS Corp.
13
Doc. No. 8160_DS, Rev. N1.0
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2: LDS8160 Functional Block Diagram
BASIC OPERATION
The LDS8160 may operate in follow modes:
a) Normal Operation Mode
b) Custom Operation Modes
c)
Normal Standby Mode
d) Low Power (LP) Standby Mode
e) Programming Modes
f)
Shutdown Mode
NORMAL OPERATION MODE
At power-up, VIN should be in the range from 2.3 V to
5.5 V (max). If VIN is slow rising, EN pin should be
logic LOW at least until VIN reaches 2.3 V level.
When EN is taken HIGH, a soft-start power-up
sequence begins and performs internal circuits reset
that requires less than 100 µs.
An initialization sequence then begins taking less
than 10 ms. This sequence determines the user-
selected
I
2C
slave
address,
loads
factory
programmed settings, and conducts initial diagnostics
for open/shorted LEDs.
At
this
point,
the
I
2C interface is ready for
communication and the LDS8160 may be user-
programmed. Upon programming completion for all
required initial parameters and features’ settings, a
calibration command is given by setting bit 4 of the
PWMC
DC2
PWMB
DB1
ADC
10 bit SAR
10
Pre-Scale
8x, 1x, or 1/4x
1 mA
0.2 mA
1 0 uA
2 uA
Si PNP
temp diode
Si Iforce
LED Iforce
Bandgap
Voltage
Reference
1.2V
Calibrated
Reference
Currents
and
ADC bias
currents
PWMA
DA1
PWMA (blue)
8 bit to 12 bit (log) PWM
Generator
to PWMA
PWMB (green)
8 bit to 12 bit (log) PWM
Generator
to PWMB
PWMC (red)
8 bit to 12 bit (log) PWM
Generator
to PWMC
Digital Temperature
Sensor / Abritrator
Temp
Compensation
Tables
Temp to PWM
adjust LUTs
Blue LUT
Green LUT
Red LUT
OverTemp
1.2V
32
OTP
Trim
OTP
Driver
Vin to 1.8V LDO
for digital core
Vin
1.8V
Gnd
POR
Start Up
To top control
Oscillator & Clock Generator
~ 1.2 MHz
to top control & dig processing
Vin
Vin to
al l
Drivers
VIN
SCLK
SDAT
SADD
GND
EN
1.2V
All Drivers 0 to 25 mA
PWMA
DA2
PWMB
DB2
PWMC
DC1
I2C Interface
Top Level Control
diagnostics
Shorted LED
Open LED
LED Calibration
Soft Start control


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