iC-HT
DUAL CW LASER DIODE DRIVER
Rev A1, Page 11/42
iC-WK MODE
Setting pin EMC = lo configures iC-HT for iC-WK
mode.
Reference Voltage in iC-WK mode
INS/WKR Reference
Voltage
similar to
Lo
Hi
0.25 V
0.5 V
iC-WKM
iC-WK, iC-WKL,
iC-WKN
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.
Table 5: Reference selection (cf. Electrical Character-
istics No. 110 )
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- External CI capacitors must be added in this opera-
imum value of 750 mA (cf. Electrical Characteristics tion mode at pins CIx and CILx. Figure 1 shows an
No. 107). In case of overcurrent, the respective chan- example in iC-WK mode using an N-type laser diode,
nel is disabled. For re-enabling the channel, the corre- where 0.5 V reference is selected. Figure 2 presents
sponding ECx pin must be set lo and then back hi.
the same configuration with an M-type laser diode.
2.8...8V
VB
DUAL CW LASER DIODE DRIVER
VDD REGULATOR
VB
ACC
REF
-
RAM
INTEGRITY
CHECK
RAM
REGISTERS
CVB
1μF
DCO
0x10 0x30
+
OVC
VDD
8 Bit
0x11
ILIM1(7:0)
N
D
CVDD
1μF
A
0x1F 0x3F
LDK1
10 Bit
0x13
0x14
REF1(9:8)
REF1(7:0)
VB UNDERVOLTAGE
VDD UNDERVOLTAGE
0.25V/0.5V
..750mA
D
+
A
CI1
CI1
-
..10 nF..
CIL1
MEMERR
CFGTIMO
NCHK
WATCHDOG
Check
WATCHDOG
TIMER
0x03
0x04
ADC1(9:8)
ADC1(7:0)
AGND1
MDA1
PODO
OVT
OVC
OSCILLATOR
IO DRIVERS
0x10 ADCC1(2:0)
EMC
R
APC
RM1
8 Bit
NCS/A1
PLR
0x12
RMD1(7:0)
MOSI/A0
SCLK/SCL
MISO/SDA
SPI/I2C
SLAVE
0
255
MRL1
LASER CHANNEL 1
N
0x05
0x06
ADC2(9:8)
ADC2(7:0)
LDK2
CI2
INS/WKR
NSTBY
EC1
..750mA
CI2
0x16
ILIM2(7:0)
LASER
..10 nF..
CIL2
AGND2
MDA2
0x18
0x19
REF2(9:8)
REF2(7:0)
CONTROL
EC2
0x17
0x02
RMD2(7:0)
TEMP(7:0)
T.PAD
GND
RM2
TEMPERATURE
MONITOR 8 Bit
GND
MRL2
LASER CHANNEL 2
Figure 1: iC-HT in iC-WK mode with N-type laser diode
ICHAUS [ IC-HAUS GMBH ]
