IC-HT_15 Datasheet, PDF (12/45 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
iC-WK MODE
preliminary
Rev B1, Page 12/45
Setting pin EMC = lo configures iC-HT for iC-WK
mode. EMC pin must be set to GND.
In iC-WK mode both channels operate in APC mode.
The internal programmable logarithmic monitor resis-
tors are disabled, therefore connection of external re-
sistors at pins MDAx is required.
The APC reference can be set to two different val-
ues by means of pin INS/WKR, as it is explained in
table 5, and the overcurrent threshold is set to its max-
imum value of 750 mA (cf. Electrical Characteristics
No. 107). In case of overcurrent, the respective chan-
nel is disabled. For re-enabling the channel, the corre-
sponding ECx pin must be set lo and then back hi.
Reference Voltage in iC-WK mode
INS/WKR Reference
Voltage
similar to
Lo
0.25 V
iC-WKM
Hi
0.5 V
iC-WK, iC-WKL,
iC-WKN
Table 5: Reference selection (cf. Electrical Character-
istics No. 110 )
External CI capacitors must be added in this opera-
tion mode at pins CIx and CILx. Figure 4 shows an
example in iC-WK mode using an N-type laser diode,
where 0.5 V reference is selected. Figure 5 presents
the same configuration with an M-type laser diode.
VB
GND
CVB
1μF
CVDD
1μF
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
0.25V/0.5V
OVC
+
-
R
8 Bit
0
LASER CHANNEL 1
APC
PLR
255
LASER CHANNEL 2
DCO
LDK1
CI1
CIL1
AGND1
MDA1
N
I LDK1
CI1
..10 nF..
RM1
MRL1
LDK2
CI2
CIL2
AGND2
MDA2
MRL2
N
I LDK2
CI2
..10 nF..
RM2
Figure 4: iC-HT in iC-WK mode with N-type laser diode