IC-HT datasheet(10/42 Pages) ICHAUS

10 / 42 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev A1, Page 10/42

OPERATING AND STANDBY MODES

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.

IC-HT датащи(PDF) 10 Page - IC-Haus GmbH