IC-HT Datasheet, PDF (20/42 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
VB 2.8...8V
CVB
1μF
CVDD
1μF
GND
DUAL CW LASER DIODE DRIVER
VDD REGULATOR
VB
- ^REF
VDD
+
NCHK
EMC
NCS/A1
MOSI/A0
SCLK/SCL
MISO/SDA
INS/WKR
NSTBY
EC1
EC2
T.PAD
GND
VB UNDERVOLTAGE
VDD UNDERVOLTAGE
CFGTIMO
Check
PODO
OVC
MEMERR
WATCHDOG
OVT
IO DRIVERS
TEMPERATURE
MONITOR 8 Bit
RAM
INTEGRITY
CHECK
0x10 0x30
0x1F 0x3F
RAM
REGISTERS
0x11 ILIM1(7:0)
0x13
0x14
REF1(9:8)
REF1(7:0)
WATCHDOG
TIMER
OSCILLATOR
0x03
0x04
ADC1(9:8)
ADC1(7:0)
0x10 ADCC1(2:0)
SPI/I2C
SLAVE
0x12 RMD1(7:0)
LASER
CONTROL
0x05
0x06
ADC2(9:8)
ADC2(7:0)
0x16 ILIM2(7:0)
0x18
0x19
REF2(9:8)
REF2(7:0)
0x17 RMD2(7:0)
0x02 TEMP(7:0)
preliminary
Rev A1, Page 20/42
ACC
8 Bit
D
A
10 Bit
D
A
10 Bit
A
D
LDK1
VDD
VB
OVC1
+
-
EACC1
ADSNF1
EM C
R
8 Bit
DISP1
0
255
LASER CHANNEL 1
DCO
LDK1
CI
ECIE1
CI1
CIL1
AGND1
MDA1
APC
PLR1
MRL1
LDK2
CI2
CI
CIL2
AGND2
MDA2
LASER CHANNEL 2
MRL2
N
..750mA
CI1
..10 nF..
RM1
Figure 8: Combining both channels
In combined mode, the internal CI nodes of both chan-
nels are connected together. If required, an external
capacitor on channel 1 can be used for improved sta-
bility. It is possible to have an additional external ca-
pacitor on channel 2 if ECIE2 bit is set to 1. Having an
external capacitor on channel 2 and none on channel
1 is invalid.
On combined operation both overcurrent thresholds
are active. The overcurrent threshold channel 1 needs
to be set to to 50% and the overcurrent threshold chan-
nel 2 should be disabled by setting it to its maximum
value (0xFF). An overcurrent will only be detected on
channel 1.
It is possible to use a second photodiode connected
to channel 2 (e.g. as a safety supervisor). The ADC
on channel 2 can be used to monitor the voltage at pin
MDA2, as it is shown in figure 9.