IC-HT datasheet(10/45 Pages) ICHAUS

10 / 45 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev B1, Page 10/45

OPERATING AND STANDBY MODES

iC-HT operating modes are selected by the pins EMC

and INS. These pins are intended to be static and

should not be changed during operation to avoid mis-

conﬁguration or unintended operation.

It is recom-

mended to tie the pins EMC and INS to VDD or GND.

Floating pins EMC and INS/WKR are detected as

faulty conﬁguration and signaled at NCHK.

iC-WK mode

In iC-WK mode the iC-HT operates as an Automatic

Power Control (APC) laser controller, similar to iC-

Haus iC-WK/iC-WKL , iC-WKM and iC-WKN. iC-WK

mode is set by pin conﬁguration and the external mon-

itor resistor. Pin EMC is set to lo and pin INS/WKR

selects the reference voltage:

• INS/WKR = hi for 0.5 V reference voltage, similar to

iC-WK, iC-WKL, iC-WKN.

• INS/WKR = lo for 0.25 V reference voltage, similar to

iC-WM.

Floating pins EMC and INS/WKR are detected as

faulty conﬁguration and signaled at NCHK.

MCU mode

In microcontroller unit (MCU) mode, iC-HT 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 in-

terface 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 pin NCHK. Any in-

put interface could be enabled if EMC or INS pins are

open. Comunication with the chip might be possible

but laser cannot be switched on. This situation is only

signaled at pin NCHK, which would remain low as long

as any of the EMC or INS pins are unconnected. MCU

must monitor the status of the pin NCHK to get all the

status information of the chip.

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 11 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 36.

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