LDS9003 / 9001
?009 IXYS Corp.
12
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2: LDS9003 / 9001 Functional Block Diagram
BASIC OPERATION
The  LDS9003/9001  may  operate  in  the  following
modes:
a)  Normal Operation Mode
b)  Normal Standby Mode
c)  Programming Modes
d)  Shutdown Mode
NORMAL OPERATION MODE
At power-up, V
IN
should be in the range from 2.5 V to
5.5 V (max). If V
IN
is slow rising, EN pin should be
logic LOW at least until V
IN
reaches a 2.5 V level.
When  EN  is  taken  HIGH,  a  soft-start  power-up
sequence begins and performs an internal circuits
reset that requires less than 100 祍.
An  initialization  sequence then  begins,  taking  less
than  10  ms.  This  sequence  determines  the  user-
selected  I
2
C   slave   address  and   loads   factory
programmed settings
At   this   point,   the   I
2
C   interface   is  ready  for
communication and the LDS9003 / 9001 may be user-
programmed. Upon programming completion for all
required   initial   boot   parameters   a   calibration
command  is  given  by setting  bit  4  of  the  Control
Register  (1Fh)  HIGH.  This  starts  the  calibration
sequence  of  the  LDS9003  /  9001  LED-Sense
TM
temperature sensing and measurement circuits and
occurs simultaneous with a gradual ramp-up of the
PWMs and current levels to  the user programmed
values. This initialization is completed in less than 250
ms in the default soft-start ramp mode, or s less than
PWM3
IPWM3
(only 9003)
TSENSE2
(only 9003)
ADC
10 bit SAR
10
Pre-Scale
1 mA
0.2 mA
1 0 uA
2 uA
Si PNP
temp diode
Si Iforce
LED Iforce
Bandgap
Reference
1.2V
Calibrated
Reference
Currents
and
ADC bias
currents
TSENSE1
TSENSE (9001)
PWM1
Generator
to PWM1
PWM2
Generator
to PWM2
PWM3
Generator
to PWM3
Digital Temperature
Sensor  / Abritrator
Temp
Compensation
Tables
Temp to PWM
adjust LUTs
LUT1
LUT2
LUT3
I2C Interface
Top Level Control
diagnostics
Shorted LED
Open LED
LED Calibration
Soft Start control
1.2V
Vin to 1.8V  LDO
f   or 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
SCL
SDA
SADD
GND
EN
1.2V
PWMA
IPWM1
IPWM(9001)
PWM2
IPWM2
(only 9003)
TSENSE3
(only 9003)
1mA
1mA
1mA
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