IC-HTP Datasheet, PDF (10/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
Rev B1, Page 10/51
OPERATING MODES AND STANDBY
iC-HTP has two operating modes:
iC-WK mode
iC-HTP operates as an Automatic Power Control (APC)
laser controller, similar to iC-Haus iC-WKP. iC-WKP
mode is set by pin configuration and external resistor.
Pin EMC is set to lo and pin INS/WKR selects the ref-
erence voltage. Floating pins EMC and INS/WKR are
detected as faulty configuration and signaled at NCHK.
MCU mode
In microcontroller unit (MCU) mode, iC-HTP features
two control modes: automatic power control (APC) and
automatic current control (ACC). Pin EMC is set to
hi and pin INS/WKR selects the serial communication
interface protocol. Selection of the communication pro-
tocol 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
signaled at NCHK.
Standby
iC-HTP in standby has a very low current consumption
(< 10 µA) and does retain its configuration. Standby will
not reset the internal RAM.
In order to exit standby, pin NSTBY must be set to hi
(e.g. VB). VDD is switched off in standby and can not
be used to exit standby.
CIx, CIHx, VB, VBLx, NSTBY and LDAx withstand volt-
ages up to 11 V, whereas the remaining input pins oper-
ate up to 5.5 V and do have high impedance at standby.
Information on timing after waking up from standby can
be found on page 40.
LASER DIODE/LED TYPES AND OPERATION MODES
For APC operation a monitor diode is required. This op- In automatic current control (ACC) operation there is
eration is possible in microcontroller unit (MCU) mode no monitor diode and any diode can be operated in
and in the iC-WK mode.
microcontroller unit (MCU) mode.
iC-HTP can operate in APC one type of laser
diodes/LEDs with monitor diodes:
• P-Type laser diodes
All operations are possible with laser diodes (LDs) or
light emitting diodes (LEDs). The following text does
not differ between laser diodes (LDs) and light emitting
diodes (LEDs).
10 Bit
D
A
EACC1
8 Bit
D
A
+
-
CI
OVC
ECIE1
DCO
VBL1
CIH1
CI1
LDA1
ACC
VDD
MRH1
VB
CI1
..10 nF..
I LDA1
EM C
8 Bit
DISP1
R
0
255
10 Bit
A
D
LDA1
VBL1
VB
A DM DK 1
LASER CHANNEL 1 ^ADFNS1
x1
x2
Signal Level Converter
APC
MDK1
RM1
P
Figure 2: iC-HTP with P-type laser diode