IC-HT_15 Datasheet, PDF (22/45 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
preliminary
Rev B1, Page 22/45
nel 2 should be disabled by setting it to its maximum
value (0xFF). An overcurrent will only be detected on
channel 1.
ILIM1
0x0A
...
0xFF
Addr. 0x11; bit 7:0
R/W 0xFF
Channel 1 overcurrent threshold: 80 mA,
MERGE=1
Channel 1 overcurrent threshold set to
Ilim = (2 ∗ ∆I(LDK ) · n), n from 10 to 255,
MERGE=1
Channel 1 overcurrent threshold: 2040 mA,
MERGE=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 12.
Table 45: Overcurrent threshold configuration channel
1 with MERGE = 1
VB
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)
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
I LDK
CI1
..10 nF..
RM1
Figure 12: Additional photodiode in combined configuration