IC-HT Datasheet, PDF (10/42 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
OPERATING AND STANDBY MODES
preliminary
Rev A1, Page 10/42
iC-HT has two operating modes: iC-WK mode
iC-HT operates as an Automatic Power Control (APC)
laser controller, similar to iC-Haus iC-WK/L, iC-WKM
and iC-WKN. iC-WK mode is set by pin configuration
and external resistor. Pin EMC is set to lo and pin
INS/WKR selects the reference voltage. Floating pins
EMC and INS/WKR are detected as faulty configura-
tion and signaled at NCHK.
MCU mode
In micocontroller unit (MCU) mode, iC-HT features two
control modes: automatic power control (APC) and au-
tomatic current control (ACC). Pin EMC is set to hi and
pin INS/WKR selects the serial communication inter-
face protocol. Selection of the communication proto-
col is achieved through pin INS/WKR: INS/WKR = hi
for I²C, INS/WKR = lo for SPI. Floating pins EMC and
INS/WKR are detected as faulty configuration and sig-
naled at NCHK.
Standby Mode
iC-HT in standby mode has a very low current con-
sumption (< 10 µA) and does retain its configuration.
Standby mode will not reset the internal RAM.
In order to exit standby mode, pin NSTBY must be set
to hi (e.g. VB). VDD is switched off in standby mode
and can not be used to exit standby mode.
VB, NSTBY and LDKx withstand voltages up to 8 V,
whereas the remaining input pins operate up to 5.5 V
and do have high impedance at standby mode.
Information on timing after waking up from standby
mode can be found on page 34.