IC-HT Datasheet, PDF (12/42 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
2.8...8V
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)
preliminary
Rev A1, Page 12/42
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
M
LDK1
CI1
CIL1
..750mA
CI1
..10 nF..
AGND1
MDA1
RM1
MRL1
M
LDK2
CI2
CIL2
AGND2
MDA2
MRL2
..750mA
CI2
..10 nF..
RM2
Figure 2: iC-HT in iC-WK mode with M-type laser diode
In the configuration from figures 1 and 2 pin NSTBY is
connected to VB. This is required to force iC-HT leav-
ing standby mode and starting normal operation, as
the pin includes an internal pull-down resistor.
Laser channel enabling
Setting pins EC1, EC2 to hi enables the corresponding
channels. In order to ensure safe operation of iC-HT,
several events automatically disable both output chan-
nels:
• Pins INS/WKR or EMC left unconnected (IN-
SOPEN, EMCOPEN), iC-HT enters error mode
and the laser channels cannot be enabled.
• Supply power-down either at VB (PDOVB) or
VDD (PDOVDD), the laser channels are uncon-
ditionally disabled during the power down event.
• Overcurrent (OVC) or overtemperature (OVT),
laser channels are switched off. Cycling pins
EC1, EC2 or a power-up is required to switch on
the laser again.