IC-HTP datasheet(10/51 Pages) ICHAUS

10 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

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-

eration is possible in microcontroller unit (MCU) mode

and in the iC-WK mode.

iC-HTP can operate in APC one type of laser

diodes/LEDs with monitor diodes:

• P-Type laser diodes

In automatic current control (ACC) operation there is

no monitor diode and any diode can be operated in

microcontroller unit (MCU) mode.

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).

8 Bit

APC

Signal Level Converter

ADMDK1

RM1

..10 nF..

LASER CHANNEL 1

10 Bit

8 Bit

ACC

255

CI1

I LDA1

CI1

DCO

CIH1

VDD

ECIE1

VBL1

LDA1

ADFNS1

EACC1

OVC

DISP1

EMC

LDA1

VBL1

MDK1

MRH1

CI1

I LDA1

Figure 2: iC-HTP with P-type laser diode

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