IC-HTP Datasheet, PDF (11/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
iC-WK MODE
Rev B1, Page 11/51
Setting pin EMC = lo configures iC-HTP for iC-WK
mode. EMC pin must be set using a pull-down resistor
or directly short-circuited to GND pin.
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 MDKx is required.
Reference Voltage in iC-WK mode
INS/WKR Reference Voltage
Lo
VDD-0.125 V
Hi
VDD-0.250 V
Table 5: Reference selection (cf. Electrical Characteris-
tics No. 110 )
The APC reference can be set to two different values by
means of pin INS/WKR, as it is explained in table 5, and
the overcurrent threshold is set to its maximum value
of 750 mA (cf. Electrical Characteristics No. 107). In
case of overcurrent, the respective channel is disabled.
For re-enabling the channel, the corresponding ECx pin
must be set lo and then back hi.
External CI capacitors must be added in this operation
mode at pins CIx and CIHx. Figure 3 shows an exam-
ple in iC-WK mode using an P-type laser diode, where
VDD-0.250 V reference is selected. Figure 4 presents
the same configuration with an P-type laser diode and
reference VDD-0.125 V.
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
0x13 REF1(9:8)
0x14 REF1(7:0)
0x11 ILIM1(7:0)
WATCHDOG
TIMER
OSCILLATOR
0x12 RMD1(7:0)
SPI/I2C
SLAVE
LASER
CONTROL
0x03
0x04
ADC1(9:8)
ADC1(7:0)
0x10 ADCC1(2:0)
0x16 ILIM2(7:0)
0x18
0x19
REF2(9:8)
REF2(7:0)
0x05
0x06
ADC2(9:8)
ADC2(7:0)
0x17 RMD2(7:0)
0x02 TEMP(7:0)
10 Bit
D
A
0.25V/0.125V
8 Bit
D
A
+
-
CI
OVC
EM C
8 Bit
DISP1
R
0
255
x1
DCO
VBL1
CIH1
CI1
LDA1
ACC
VDD
MRH1
VB
CI1
..10 nF..
I LDA1
APC
MDK1
RM1
P
LASER CHANNEL 1
LASER CHANNEL 2
x2
Signal Level Converter
VBL2
CIH2
CI2
LDA2
MRH2
VB
CI2
..10 nF..
I LDA2
MDK2
RM2
P
Figure 3: iC-HTP in iC-WK mode with P-type laser diode and reference VDD-0.250V